diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
deleted file mode 100644
index c47cbc8..0000000
--- a/CONTRIBUTING.md
+++ /dev/null
@@ -1,18 +0,0 @@
-## Contributing
-
-This project uses the [git
-flow](http://nvie.com/posts/a-successful-git-branching-model/) model for
-development. There's [a handy git module for git
-flow](//github.com/nvie/gitflow). If you'd like to be added as a contributor,
-the price of admission is 1 pull request. Please follow the general code style
-guides (read the code) and in your pull request explain the reason for the
-proposed change and how it is valuable.
-
-## Pull Requests
-
-Please make your pull requests against the `develop` branch; we stage changes
-for testing there to avoid unexpected breakages for our users. :)
-
-## Bug report
-
-Report a bug on [GitHub Issues](https://github.com/pangloss/vim-javascript/issues).
diff --git a/ISSUE_TEMPLATE.md b/ISSUE_TEMPLATE.md
new file mode 100644
index 0000000..155ea8d
--- /dev/null
+++ b/ISSUE_TEMPLATE.md
@@ -0,0 +1,12 @@
+If you are reporting an issue that involves any JSX (e.g.
+<div>{`${example}`}</div>), PLEASE PLEASE PLEASE make sure you have properly
+setup and are sourcing this plugin https://github.com/mxw/vim-jsx
+
+WE DO NOT support JSX automatically, you need another plugin to add get this
+functionality.
+
+If applicable, include a snippet of code that we can easily copy and paste that
+replicates your bug.
+
+Make sure the bug still exists if you disable all other javascript plugins
+except the one noted above, mxw/vim-jsx
diff --git a/README.md b/README.md
index 1cd79f4..b60614f 100644
--- a/README.md
+++ b/README.md
@@ -6,32 +6,12 @@ improved indentation.
 
 ## Installation
 
-### Install with [Vundle](https://github.com/gmarik/vundle)
-
-Add to vimrc:
-
-    Plugin 'pangloss/vim-javascript'
-
-And install it:
-
-    :so ~/.vimrc
-    :PluginInstall
-
-### Install with [vim-plug](https://github.com/junegunn/vim-plug)
-
-Add to vimrc:
-
-    Plug 'pangloss/vim-javascript'
-
-And install it:
-
-    :so ~/.vimrc
-    :PlugInstall
-
 ### Install with [pathogen](https://github.com/tpope/vim-pathogen)
 
       git clone https://github.com/pangloss/vim-javascript.git ~/.vim/bundle/vim-javascript
 
+alternatively, use a package manager like [vim-plug](https://github.com/junegunn/vim-plug)
+
 
 ## Configuration Variables
 
@@ -83,38 +63,53 @@ global vim option, we do not set it ourselves.
 
 ## Concealing Characters
 
-You can customize concealing characters by defining one or more of the following
+You can customize concealing characters, if your font provides the glyph you want, by defining one or more of the following
 variables:
 
-    let g:javascript_conceal_function       = "ƒ"
-    let g:javascript_conceal_null           = "ø"
-    let g:javascript_conceal_this           = "@"
-    let g:javascript_conceal_return         = "⇚"
-    let g:javascript_conceal_undefined      = "¿"
-    let g:javascript_conceal_NaN            = "ℕ"
-    let g:javascript_conceal_prototype      = "¶"
-    let g:javascript_conceal_static         = "•"
-    let g:javascript_conceal_super          = "Ω"
-    let g:javascript_conceal_arrow_function = "⇒"
+    let g:javascript_conceal_function             = "ƒ"
+    let g:javascript_conceal_null                 = "ø"
+    let g:javascript_conceal_this                 = "@"
+    let g:javascript_conceal_return               = "⇚"
+    let g:javascript_conceal_undefined            = "¿"
+    let g:javascript_conceal_NaN                  = "ℕ"
+    let g:javascript_conceal_prototype            = "¶"
+    let g:javascript_conceal_static               = "•"
+    let g:javascript_conceal_super                = "Ω"
+    let g:javascript_conceal_arrow_function       = "⇒"
+    let g:javascript_conceal_noarg_arrow_function = "🞅"
+    let g:javascript_conceal_underscore_arrow_function = "🞅"
+
+
+You can enable concealing within VIM with:
+
+    set conceallevel=1
+
+OR if you wish to toggle concealing you may wish to bind a command such as the following which will map `<LEADER>l` (leader is usually the `\` key) to toggling conceal mode:
+
+    map <leader>l :exec &conceallevel ? "set conceallevel=0" : "set conceallevel=1"<CR>
+
 
 ## Indentation Specific
 
 * `:h cino-:`
+* `:h cino-=`
+* `:h cino-star`
+* `:h cino-(`
+* `:h cino-w`
+* `:h cino-W`
+* `:h cino-U`
+* `:h cino-m`
+* `:h cino-M`
+* `:h 'indentkeys'`
 
 ## Contributing
 
-This project uses the [git
-flow](http://nvie.com/posts/a-successful-git-branching-model/) model for
-development. There's [a handy git module for git
-flow](//github.com/nvie/gitflow). If you'd like to be added as a contributor,
-the price of admission is 1 pull request. Please follow the general code style
+Please follow the general code style
 guides (read the code) and in your pull request explain the reason for the
-proposed change and how it is valuable.
-
-
-## Bug Reports
+proposed change and how it is valuable. All p.r.'s will be reviewed by a
+maintainer(s) then, hopefully, merged.
 
-Report a bug on [GitHub Issues](https://github.com/pangloss/vim-javascript/issues).
+Thank you!
 
 
 ## License
diff --git a/compiler/eslint.vim b/compiler/eslint.vim
new file mode 100644
index 0000000..7695a07
--- /dev/null
+++ b/compiler/eslint.vim
@@ -0,0 +1,16 @@
+" Vim compiler plugin
+" Language:     JavaScript
+" Maintainer:   vim-javascript community
+" URL:          https://github.com/pangloss/vim-javascript
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "eslint"
+
+if exists(":CompilerSet") != 2
+  command! -nargs=* CompilerSet setlocal <args>
+endif
+
+CompilerSet makeprg=eslint\ -f\ compact\ %
+CompilerSet errorformat=%f:\ line\ %l\\,\ col\ %c\\,\ %m
diff --git a/extras/flow.vim b/extras/flow.vim
index 028ea3f..204fdbe 100644
--- a/extras/flow.vim
+++ b/extras/flow.vim
@@ -1,33 +1,38 @@
 syntax region  jsFlowDefinition     contained                        start=/:/    end=/\%(\s*[,=;)\n]\)\@=/ contains=@jsFlowCluster containedin=jsParen
 syntax region  jsFlowArgumentDef    contained                        start=/:/    end=/\%(\s*[,)]\|=>\@!\)\@=/ contains=@jsFlowCluster
-syntax region  jsFlowArray          contained matchgroup=jsFlowNoise start=/\[/   end=/\]/        contains=@jsFlowCluster
-syntax region  jsFlowObject         contained matchgroup=jsFlowNoise start=/{/    end=/}/         contains=@jsFlowCluster
-syntax region  jsFlowParens         contained matchgroup=jsFlowNoise start=/(/  end=/)/ contains=@jsFlowCluster
+syntax region  jsFlowArray          contained matchgroup=jsFlowNoise start=/\[/   end=/\]/        contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowObject         contained matchgroup=jsFlowNoise start=/{/    end=/}/         contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowExactObject    contained matchgroup=jsFlowNoise start=/{|/   end=/|}/       contains=@jsFlowCluster,jsComment fold
+syntax region  jsFlowParens         contained matchgroup=jsFlowNoise start=/(/  end=/)/ contains=@jsFlowCluster keepend fold
 syntax match   jsFlowNoise          contained /[:;,<>]/
-syntax keyword jsFlowType           contained boolean number string null void any mixed JSON array function object array bool class
+syntax keyword jsFlowType           contained boolean number string null void any mixed JSON array Function object array bool class
 syntax keyword jsFlowTypeof         contained typeof skipempty skipempty nextgroup=jsFlowTypeCustom,jsFlowType
 syntax match   jsFlowTypeCustom     contained /[0-9a-zA-Z_.]*/ skipwhite skipempty nextgroup=jsFlowGroup
 syntax region  jsFlowGroup          contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster
 syntax region  jsFlowArrowArguments contained matchgroup=jsFlowNoise start=/(/  end=/)\%(\s*=>\)\@=/ oneline skipwhite skipempty nextgroup=jsFlowArrow contains=@jsFlowCluster
 syntax match   jsFlowArrow          contained /=>/ skipwhite skipempty nextgroup=jsFlowType,jsFlowTypeCustom,jsFlowParens
-syntax match   jsFlowMaybe          contained /?/ skipwhite skipempty nextgroup=jsFlowType,jsFlowTypeCustom,jsFlowParens,jsFlowArrowArguments
 syntax match   jsFlowObjectKey      contained /[0-9a-zA-Z_$?]*\(\s*:\)\@=/ contains=jsFunctionKey,jsFlowMaybe skipwhite skipempty nextgroup=jsObjectValue containedin=jsObject
 syntax match   jsFlowOrOperator     contained /|/ skipwhite skipempty nextgroup=@jsFlowCluster
+syntax keyword jsFlowImportType     contained type skipwhite skipempty nextgroup=jsModuleAsterisk,jsModuleKeyword,jsModuleGroup
+syntax match   jsFlowWildcard       contained /*/
 
-syntax match   jsFlowReturn         contained /:\s*/ contains=jsFlowNoise skipwhite skipempty nextgroup=@jsFlowReturnCluster
-syntax region  jsFlowReturnObject   contained matchgroup=jsFlowNoise start=/{/    end=/}/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
-syntax region  jsFlowReturnArray    contained matchgroup=jsFlowNoise start=/\[/   end=/\]/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
-syntax region  jsFlowReturnParens   contained matchgroup=jsFlowNoise start=/(/    end=/)/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
+syntax match   jsFlowReturn         contained /:\s*/ contains=jsFlowNoise skipwhite skipempty nextgroup=@jsFlowReturnCluster,jsFlowArrow,jsFlowReturnParens
+syntax region  jsFlowReturnObject   contained matchgroup=jsFlowNoise start=/{/    end=/}/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp fold
+syntax region  jsFlowReturnArray    contained matchgroup=jsFlowNoise start=/\[/   end=/\]/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp fold
+syntax region  jsFlowReturnParens   contained matchgroup=jsFlowNoise start=/(/    end=/)/  contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp,jsFlowReturnArrow fold
+syntax match   jsFlowReturnArrow    contained /=>/ skipwhite skipempty nextgroup=@jsFlowReturnCluster
 syntax match   jsFlowReturnKeyword  contained /\k\+/ contains=jsFlowType,jsFlowTypeCustom skipwhite skipempty nextgroup=jsFlowReturnGroup,jsFuncBlock,jsFlowReturnOrOp
-syntax match   jsFlowReturnMaybe    contained /?/ skipwhite skipempty nextgroup=jsFlowReturnKeyword
+syntax match   jsFlowReturnMaybe    contained /?/ skipwhite skipempty nextgroup=jsFlowReturnKeyword,jsFlowReturnObject
 syntax region  jsFlowReturnGroup    contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturnOrOp
 syntax match   jsFlowReturnOrOp     contained /\s*|\s*/ skipwhite skipempty nextgroup=@jsFlowReturnCluster
+syntax match   jsFlowWildcardReturn contained /*/ skipwhite skipempty nextgroup=jsFuncBlock
 
 syntax region  jsFlowFunctionGroup  contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsFuncArgs
 syntax region  jsFlowClassGroup     contained matchgroup=jsFlowNoise start=/</ end=/>/ contains=@jsFlowCluster skipwhite skipempty nextgroup=jsClassBlock
 
-syntax region  jsFlowTypeStatement                                   start=/type/    end=/=\@=/ contains=jsFlowTypeOperator oneline skipwhite skipempty nextgroup=jsFlowTypeValue keepend
-syntax region  jsFlowTypeValue      contained                        start=/=/       end=/[;\n]/ contains=@jsExpression,jsFlowGroup,jsFlowMaybe
+syntax region  jsFlowTypeStatement                                   start=/type\%(\s\+\k\)\@=/    end=/=\@=/ contains=jsFlowTypeOperator oneline skipwhite skipempty nextgroup=jsFlowTypeValue keepend
+syntax region  jsFlowTypeValue      contained     matchgroup=jsFlowNoise start=/=/       end=/[\n;]/ contains=@jsFlowCluster,jsFlowGroup,jsFlowMaybe
+syntax match   jsFlowTypeOperator   contained /=/ containedin=jsFlowTypeValue
 syntax match   jsFlowTypeOperator   contained /=/
 syntax keyword jsFlowTypeKeyword    contained type
 
@@ -37,12 +42,18 @@ syntax region  jsFlowClassDef       contained start=/:/    end=/\%(\s*[,=;)\n]\)
 
 syntax region  jsFlowModule         contained start=/module/ end=/{\@=/ skipempty skipempty nextgroup=jsFlowDeclareBlock contains=jsString
 syntax region  jsFlowInterface      contained start=/interface/ end=/{\@=/ skipempty skipempty nextgroup=jsFlowInterfaceBlock contains=@jsFlowCluster
-syntax region  jsFlowDeclareBlock   contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsFlowDeclare,jsFlowNoise
+syntax region  jsFlowDeclareBlock   contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsFlowDeclare,jsFlowNoise fold
 
-syntax region jsFlowInterfaceBlock  contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsFlowNoise keepend
+" NOTE: It appears the nextgroup was causing a ton of breakages... testing it
+" witout a nextgroup, but keeping this arround for reference incase something breaks
+" syntax match   jsFlowMaybe          contained /?/ nextgroup=jsFlowType,jsFlowTypeCustom,jsFlowParens,jsFlowArrowArguments,jsFlowObject,jsFlowReturnObject extend keepend
+syntax match   jsFlowMaybe          contained /?/
+syntax region  jsFlowInterfaceBlock contained matchgroup=jsFlowNoise start=/{/ end=/}/ contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsFlowNoise keepend fold
 
-syntax cluster jsFlowReturnCluster            contains=jsFlowNoise,jsFlowReturnObject,jsFlowReturnArray,jsFlowReturnKeyword,jsFlowReturnGroup,jsFlowReturnMaybe,jsFlowReturnOrOp
-syntax cluster jsFlowCluster                  contains=jsFlowArray,jsFlowObject,jsFlowNoise,jsFlowTypeof,jsFlowType,jsFlowGroup,jsFlowArrowArguments,jsFlowMaybe,jsFlowParens,jsFlowOrOperator
+syntax region  jsFlowParenAnnotation contained start=/:/ end=/[,=)]\@=/ containedin=jsParen contains=@jsFlowCluster
+
+syntax cluster jsFlowReturnCluster            contains=jsFlowNoise,jsFlowReturnObject,jsFlowReturnArray,jsFlowReturnKeyword,jsFlowReturnGroup,jsFlowReturnMaybe,jsFlowReturnOrOp,jsFlowWildcardReturn,jsFlowReturnArrow
+syntax cluster jsFlowCluster                  contains=jsFlowArray,jsFlowObject,jsFlowExactObject,jsFlowNoise,jsFlowTypeof,jsFlowType,jsFlowGroup,jsFlowArrowArguments,jsFlowMaybe,jsFlowParens,jsFlowOrOperator,jsFlowWildcard
 
 if version >= 508 || !exists("did_javascript_syn_inits")
   if version < 508
@@ -59,9 +70,11 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowTypeof             PreProc
   HiLink jsFlowArray              PreProc
   HiLink jsFlowObject             PreProc
+  HiLink jsFlowExactObject        PreProc
   HiLink jsFlowParens             PreProc
   HiLink jsFlowGroup              PreProc
   HiLink jsFlowReturn             PreProc
+  HiLink jsFlowParenAnnotation    PreProc
   HiLink jsFlowReturnObject       jsFlowReturn
   HiLink jsFlowReturnArray        jsFlowArray
   HiLink jsFlowReturnParens       jsFlowParens
@@ -70,9 +83,10 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowClassGroup         PreProc
   HiLink jsFlowArrowArguments     PreProc
   HiLink jsFlowArrow              PreProc
+  HiLink jsFlowReturnArrow        PreProc
   HiLink jsFlowTypeStatement      PreProc
   HiLink jsFlowTypeKeyword        PreProc
-  HiLink jsFlowTypeOperator       PreProc
+  HiLink jsFlowTypeOperator       Operator
   HiLink jsFlowMaybe              PreProc
   HiLink jsFlowReturnMaybe        PreProc
   HiLink jsFlowClassProperty      jsClassProperty
@@ -81,7 +95,11 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFlowInterface          PreProc
   HiLink jsFlowNoise              Noise
   HiLink jsFlowObjectKey          jsObjectKey
-  HiLink jsFlowOrOperator         PreProc
+  HiLink jsFlowOrOperator         jsOperator
   HiLink jsFlowReturnOrOp         jsFlowOrOperator
+  HiLink jsFlowWildcard           PreProc
+  HiLink jsFlowWildcardReturn     PreProc
+  HiLink jsFlowImportType         PreProc
+  HiLink jsFlowTypeValue          PreProc
   delcommand HiLink
 endif
diff --git a/extras/jsdoc.vim b/extras/jsdoc.vim
index 645d55a..a19f3a3 100644
--- a/extras/jsdoc.vim
+++ b/extras/jsdoc.vim
@@ -4,13 +4,13 @@ syntax region jsComment    matchgroup=jsComment start="/\*\s*"  end="\*/" contai
 " tags containing a param
 syntax match  jsDocTags         contained "@\(alias\|api\|augments\|borrows\|class\|constructs\|default\|defaultvalue\|emits\|exception\|exports\|extends\|fires\|kind\|link\|listens\|member\|member[oO]f\|mixes\|module\|name\|namespace\|requires\|template\|throws\|var\|variation\|version\)\>" skipwhite nextgroup=jsDocParam
 " tags containing type and param
-syntax match  jsDocTags         contained "@\(arg\|argument\|cfg\|param\|property\|prop\)\>" skipwhite nextgroup=jsDocType
+syntax match  jsDocTags         contained "@\(arg\|argument\|cfg\|param\|property\|prop\|typedef\)\>" skipwhite nextgroup=jsDocType
 " tags containing type but no param
-syntax match  jsDocTags         contained "@\(callback\|define\|enum\|external\|implements\|this\|type\|typedef\|return\|returns\)\>" skipwhite nextgroup=jsDocTypeNoParam
+syntax match  jsDocTags         contained "@\(callback\|define\|enum\|external\|implements\|this\|type\|return\|returns\)\>" skipwhite nextgroup=jsDocTypeNoParam
 " tags containing references
 syntax match  jsDocTags         contained "@\(lends\|see\|tutorial\)\>" skipwhite nextgroup=jsDocSeeTag
 " other tags (no extra syntax)
-syntax match  jsDocTags         contained "@\(abstract\|access\|accessor\|author\|classdesc\|constant\|const\|constructor\|copyright\|deprecated\|desc\|description\|dict\|event\|example\|file\|file[oO]verview\|final\|function\|global\|ignore\|inheritDoc\|inner\|instance\|interface\|license\|localdoc\|method\|mixin\|nosideeffects\|override\|overview\|preserve\|private\|protected\|public\|readonly\|since\|static\|struct\|todo\|summary\|undocumented\|virtual\)\>"
+syntax match  jsDocTags         contained "@\(abstract\|access\|accessor\|async\|author\|classdesc\|constant\|const\|constructor\|copyright\|deprecated\|desc\|description\|dict\|event\|example\|file\|file[oO]verview\|final\|function\|global\|ignore\|inheritDoc\|inner\|instance\|interface\|license\|localdoc\|method\|mixin\|nosideeffects\|override\|overview\|preserve\|private\|protected\|public\|readonly\|since\|static\|struct\|todo\|summary\|undocumented\|virtual\)\>"
 
 syntax region jsDocType         contained matchgroup=jsDocTypeBrackets start="{" end="}" contains=jsDocTypeRecord oneline skipwhite nextgroup=jsDocParam
 syntax match  jsDocType         contained "\%(#\|\"\|\w\|\.\|:\|\/\)\+" skipwhite nextgroup=jsDocParam
diff --git a/ftdetect/javascript.vim b/ftdetect/javascript.vim
index d6aa6d0..ff07f4d 100644
--- a/ftdetect/javascript.vim
+++ b/ftdetect/javascript.vim
@@ -1,6 +1,13 @@
-au BufNewFile,BufRead *.js setf javascript
-au BufNewFile,BufRead *.jsm setf javascript
-au BufNewFile,BufRead Jakefile setf javascript
+au BufNewFile,BufRead *.{js,mjs,jsm,es,es6},Jakefile setf javascript
+
+fun! s:SourceFlowSyntax()
+  if !exists('javascript_plugin_flow') && !exists('b:flow_active') &&
+        \ search('\v\C%^\_s*%(//\s*|/\*[ \t\n*]*)\@flow>','nw')
+    runtime extras/flow.vim
+    let b:flow_active = 1
+  endif
+endfun
+au FileType javascript au BufRead,BufWritePost <buffer> call s:SourceFlowSyntax()
 
 fun! s:SelectJavascript()
   if getline(1) =~# '^#!.*/bin/\%(env\s\+\)\?node\>'
diff --git a/indent/javascript.vim b/indent/javascript.vim
index b72ff92..e7334bf 100644
--- a/indent/javascript.vim
+++ b/indent/javascript.vim
@@ -2,7 +2,7 @@
 " Language: Javascript
 " Maintainer: Chris Paul ( https://github.com/bounceme )
 " URL: https://github.com/pangloss/vim-javascript
-" Last Change: November 6, 2016
+" Last Change: August 12, 2017
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -10,13 +10,27 @@ if exists('b:did_indent')
 endif
 let b:did_indent = 1
 
+" indent correctly if inside <script>
+" vim/vim@690afe1 for the switch from cindent
+let b:html_indent_script1 = 'inc'
+
 " Now, set up our indentation expression and keys that trigger it.
 setlocal indentexpr=GetJavascriptIndent()
 setlocal autoindent nolisp nosmartindent
-setlocal indentkeys=0{,0},0),0],:,!^F,o,O,e
-setlocal cinoptions+=j1,J1
+setlocal indentkeys+=0],0)
+" Testable with something like:
+" vim  -eNs "+filetype plugin indent on" "+syntax on" "+set ft=javascript" \
+"       "+norm! gg=G" '+%print' '+:q!' testfile.js \
+"       | diff -uBZ testfile.js -
+
+let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys<'
 
-let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys< cinoptions<'
+" Regex of syntax group names that are or delimit string or are comments.
+let b:syng_strcom = get(b:,'syng_strcom','string\|comment\|regex\|special\|doc\|template\%(braces\)\@!')
+let b:syng_str = get(b:,'syng_str','string\|template\|special')
+" template strings may want to be excluded when editing graphql:
+" au! Filetype javascript let b:syng_str = '^\%(.*template\)\@!.*string\|special'
+" au! Filetype javascript let b:syng_strcom = '^\%(.*template\)\@!.*string\|comment\|regex\|special\|doc'
 
 " Only define the function once.
 if exists('*GetJavascriptIndent')
@@ -33,165 +47,343 @@ if exists('*shiftwidth')
   endfunction
 else
   function s:sw()
-    return &sw
+    return &l:shiftwidth ? &l:shiftwidth : &l:tabstop
   endfunction
 endif
 
-let s:case_stmt = '\<\%(case\>\s*[^ \t:].*\|default\s*\):\C'
+" Performance for forwards search(): start search at pos rather than masking
+" matches before pos.
+let s:z = has('patch-7.4.984') ? 'z' : ''
 
-" Regex of syntax group names that are or delimit string or are comments.
-let s:syng_strcom = 'string\|comment\|regex\|special\|doc\|template'
+let s:syng_com = 'comment\|doc'
 " Expression used to check whether we should skip a match with searchpair().
-let s:skip_expr = "synIDattr(synID(line('.'),col('.'),0),'name') =~? '".s:syng_strcom."'"
-function s:skip_func(lnum)
-  if !s:free || search('`\|\*\/','nW',a:lnum)
-    let s:free = !eval(s:skip_expr . " . '\\|html'")
-    let s:looksyn = s:free ? line('.') : s:looksyn
-    return !s:free
-  endif
-  let s:looksyn = line('.')
-  return (search('\/','nbW',s:looksyn) || search('[''"\\]','nW',s:looksyn)) && eval(s:skip_expr . " . '\\|html'")
-endfunction
+let s:skip_expr = "s:SynAt(line('.'),col('.')) =~? b:syng_strcom"
 
+" searchpair() wrapper
 if has('reltime')
   function s:GetPair(start,end,flags,skip,time,...)
-    return searchpair(a:start,'',a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 2000,0] + a:000),a:time)
+    return searchpair('\m'.(a:start == '[' ? '\[' : a:start),'','\m'.a:end,
+          \ a:flags,a:skip,max([prevnonblank(v:lnum) - 2000,0] + a:000),a:time)
   endfunction
 else
   function s:GetPair(start,end,flags,skip,...)
-    return searchpair(a:start,'',a:end,a:flags,a:skip,max([prevnonblank(v:lnum) - 1000,get(a:000,1)]))
+    return searchpair('\m'.(a:start == '[' ? '\[' : a:start),'','\m'.a:end,
+          \ a:flags,a:skip,max([prevnonblank(v:lnum) - 1000,0,get(a:000,1)]))
   endfunction
 endif
 
-function s:current_char()
-  return getline('.')[col('.')-1]
+function s:SynAt(l,c)
+  let byte = line2byte(a:l) + a:c - 1
+  let pos = index(s:synid_cache[0], byte)
+  if pos == -1
+    let s:synid_cache[:] += [[byte], [synIDattr(synID(a:l, a:c, 0), 'name')]]
+  endif
+  return s:synid_cache[1][pos]
 endfunction
 
-function s:token()
-  return s:current_char() =~ '\k' ? expand('<cword>') : s:current_char()
+function s:ParseCino(f)
+  let [cin, divider, n] = [strridx(&cino,a:f), 0, '']
+  if cin == -1
+    return
+  endif
+  let [sign, cstr] = &cino[cin+1] == '-' ? [-1, &cino[cin+2:]] : [1, &cino[cin+1:]]
+  for c in split(cstr,'\zs')
+    if c == '.' && !divider
+      let divider = 1
+    elseif c ==# 's'
+      if n is ''
+        let n = s:sw()
+      else
+        let n = str2nr(n) * s:sw()
+      endif
+      break
+    elseif c =~ '\d'
+      let [n, divider] .= [c, 0]
+    else
+      break
+    endif
+  endfor
+  return sign * str2nr(n) / max([str2nr(divider),1])
 endfunction
 
-" NOTE: moves the cursor
-function s:previous_token()
-  return search('\<\|[][`^!"%-/:-?{-~]','bW') ? s:token() : ''
+" Optimized {skip} expr, only callable from the search loop which
+" GetJavascriptIndent does to find the containing [[{(] (relies on s:vars)
+function s:SkipFunc()
+  if s:top_col == 1
+    throw 'out of bounds'
+  endif
+  let s:top_col = 0
+  if s:check_in
+    if eval(s:skip_expr)
+      return 1
+    endif
+    let s:check_in = 0
+  elseif getline('.') =~ '\%<'.col('.').'c\/.\{-}\/\|\%>'.col('.').'c[''"]\|\\$'
+    if eval(s:skip_expr)
+      let s:looksyn = line('.')
+      return 1
+    endif
+  elseif search('\m`\|\${\|\*\/','nW'.s:z,s:looksyn) && eval(s:skip_expr)
+    let s:check_in = 1
+    return 1
+  endif
+  let [s:looksyn, s:top_col] = getpos('.')[1:2]
 endfunction
 
-function s:Trim(ln)
-  let pline = substitute(getline(a:ln),'\s*$','','')
-  let l:max = max([strridx(pline,'//'),strridx(pline,'/*'),0])
-  while l:max && synIDattr(synID(a:ln, strlen(pline), 0), 'name') =~? 'comment\|doc'
-    let pline = substitute(strpart(pline, 0, l:max),'\s*$','','')
-    let l:max = max([strridx(pline,'//'),strridx(pline,'/*'),0])
+function s:AlternatePair()
+  let [pat, l:for] = ['[][(){};]', 2]
+  while s:SearchLoop('\m'.pat,'bW',s:script_tag,'s:SkipFunc()')
+    if s:LookingAt() == ';'
+      if !l:for
+        if s:GetPair('{','}','bW','s:SkipFunc()',2000,s:script_tag)
+          return
+        endif
+        break
+      else
+        let [pat, l:for] = ['[{}();]', l:for - 1]
+      endif
+    else
+      let idx = stridx('])}',s:LookingAt())
+      if idx == -1
+        return
+      elseif !s:GetPair('[({'[idx],'])}'[idx],'bW','s:SkipFunc()',2000,s:script_tag)
+        break
+      endif
+    endif
   endwhile
-  return pline
+  throw 'out of bounds'
 endfunction
 
-" configurable regexes that define continuation lines, not including (, {, or [.
-let s:opfirst = '^' . get(g:,'javascript_opfirst',
-      \ '\%([<>,?^%|*/&]\|\([-.:+]\)\1\@!\|=>\@!\|in\%(stanceof\)\=\>\)')
-let s:continuation = get(g:,'javascript_continuation',
-      \ '\%([<=,.?/*^%|&:]\|+\@<!+\|-\@<!-\|=\@<!>\|\<in\%(stanceof\)\=\)') . '$'
-
-function s:OneScope(lnum,text)
-  if cursor(a:lnum, match(' ' . a:text, ')$')) + 1 &&
-        \ s:GetPair('(', ')', 'bW', s:skip_expr, 100) > 0
-    let token = s:previous_token()
-    if index(split('await each'),token) + 1
-      return s:previous_token() ==# 'for'
+function s:Nat(int)
+  return a:int * (a:int > 0)
+endfunction
+
+function s:LookingAt()
+  return getline('.')[col('.')-1]
+endfunction
+
+function s:Token()
+  return s:LookingAt() =~ '\k' ? expand('<cword>') : s:LookingAt()
+endfunction
+
+function s:PreviousToken()
+  let l:pos = getpos('.')
+  if search('\m\k\{1,}\|\S','ebW')
+    if (strpart(getline('.'),col('.')-2,2) == '*/' || line('.') != l:pos[1] &&
+          \ getline('.')[:col('.')-1] =~ '\/\/') && s:SynAt(line('.'),col('.')) =~? s:syng_com
+      if s:SearchLoop('\m\S\ze\_s*\/[/*]','bW',"s:SynAt(line('.'),col('.')) =~? s:syng_com")
+        return s:Token()
+      endif
+      call setpos('.',l:pos)
+    else
+      return s:Token()
     endif
-    return index(split('for if let while with'),token) + 1
   endif
-  return cursor(a:lnum, match(' ' . a:text, '\%(\<else\|\<do\|=>\)$\C')) + 1
+  return ''
+endfunction
+
+function s:Pure(f,...)
+  let l:pos = getpos('.')
+  let ret = call(a:f,a:000)
+  call setpos('.',l:pos)
+  return ret
+endfunction
+
+function s:SearchLoop(...)
+  let l:pos = getpos('.')
+  while call('search',a:000[:-2]) " search flags [^nc]
+    if !eval(a:000[-1])
+      return line('.')
+    endif
+  endwhile
+  call setpos('.',l:pos)
 endfunction
 
-function s:iscontOne(i,num,cont)
-  let [l:i, l:cont, l:num] = [a:i, a:cont, a:num + !a:num]
-  let pind = a:num ? indent(l:num) + s:W : 0
-  let ind = indent(l:i) + (a:cont ? 0 : s:W)
-  let bL = 0
-  while l:i >= l:num && (!l:cont || ind > pind)
-    if indent(l:i) < ind " first line always true for !a:cont, false for !!a:cont
-      if s:OneScope(l:i,s:Trim(l:i))
-        let bL += s:W
-        let [l:cont, l:i] = [0, line('.')]
-      elseif !l:cont
+function s:ExprCol()
+  if getline('.')[col('.')-2] == ':'
+    return 1
+  endif
+  let [bal, l:pos] = [0, getpos('.')]
+  while s:SearchLoop('\m[{}?:]','bW',s:script_tag,s:skip_expr)
+    if s:LookingAt() == ':'
+      let bal -= strpart(getline('.'),col('.')-2,3) !~ '::'
+    elseif s:LookingAt() == '?'
+      let bal += 1
+      if bal == 1
         break
       endif
-    elseif !a:cont
+    elseif s:LookingAt() == '{'
+      let bal = !s:IsBlock()
+      break
+    elseif !s:GetPair('{','}','bW',s:skip_expr,200)
       break
     endif
-    let ind = min([ind, indent(l:i)])
-    let l:i = s:PrevCodeLine(l:i - 1)
   endwhile
-  return bL
+  call setpos('.',l:pos)
+  return s:Nat(bal)
 endfunction
 
-" https://github.com/sweet-js/sweet.js/wiki/design#give-lookbehind-to-the-reader
-function s:IsBlock(...)
-  let l:ln = get(a:000,0,line('.'))
-  let char = s:previous_token()
-  let syn = char =~ '[{>/]' || l:ln != line('.') ? synIDattr(synID(line('.'),col('.')-(char == '{'),0),'name') : ''
-  if char is ''
-    return 1
-  elseif syn =~? 'xml\|jsx'
-    return char != '{'
-  elseif syn =~? 'comment'
-    return search('\/[/*]','bW') && s:IsBlock(l:ln)
-  elseif char == '>'
-    return getline('.')[col('.')-2] == '=' || syn =~? '^jsflow'
-  elseif char == ':'
-    return cursor(0,match(' ' . strpart(getline('.'),0,col('.')),'.*\zs' . s:case_stmt . '$')) + 1 &&
-          \ (expand('<cword>') !=# 'default' || s:previous_token() !~ '[,{]')
+" configurable regexes that define continuation lines, not including (, {, or [.
+let s:opfirst = '^' . get(g:,'javascript_opfirst',
+      \ '\C\%([<>=,.?^%|/&]\|\([-:+]\)\1\@!\|\*\+\|!=\|in\%(stanceof\)\=\>\)')
+let s:continuation = get(g:,'javascript_continuation',
+      \ '\C\%([<=,.~!?/*^%|&:]\|+\@<!+\|-\@<!-\|=\@<!>\|\<\%(typeof\|new\|delete\|void\|in\|instanceof\|await\)\)') . '$'
+
+function s:Continues(ln,con)
+  let tok = matchstr(a:con[-15:],s:continuation)
+  if tok =~ '[a-z:]'
+    call cursor(a:ln, len(a:con))
+    return tok == ':' ? s:ExprCol() : s:PreviousToken() != '.'
+  elseif tok !~ '[/>]'
+    return tok isnot ''
   endif
-  return index(split('return const let import export yield default delete var void typeof throw new in instanceof'
-        \ . ' - = ~ ! < * + , / ? ^ % | & ( ['), char) < (0 + (line('.') != l:ln))
+  return s:SynAt(a:ln, len(a:con)) !~? (tok == '>' ? 'jsflow\|^html' : 'regex')
 endfunction
 
-" Find line above 'lnum' that isn't empty, in a comment, or in a string.
+function s:Trim(ln)
+  let divi = split(getline(a:ln),'\s\+$\|\S\zs\ze\s*\/[/*]')
+  while len(divi) > 1 && s:SynAt(a:ln, len(join(divi,''))) =~? s:syng_com
+    call remove(divi,-1)
+  endwhile
+  return join(divi,'')
+endfunction
+
+" Find line above 'lnum' that isn't empty or in a comment
 function s:PrevCodeLine(lnum)
-  let l:lnum = prevnonblank(a:lnum)
-  while l:lnum
-    let syn = synIDattr(synID(l:lnum,matchend(getline(l:lnum), '^\s*[^''"`]'),0),'name')
-    if syn =~? 'html'
-      return
-    elseif syn !~? s:syng_strcom
-      return l:lnum
+  let [l:multi, l:n, l:pos] = [0, prevnonblank(a:lnum), getpos('.')]
+  while l:n
+    if getline(l:n) =~ '^\s*\/[/*]' && (getline(l:n) !~ '`' &&
+          \ getline(l:n-1)[-1:] != '\' || s:SynAt(l:n,1) !~? b:syng_str)
+      let l:n = prevnonblank(l:n-1)
+      continue
+    elseif l:multi || getline(l:n) =~ '\*\/'
+      call cursor(l:n,1)
+      if search('\m\/\*\|\(\*\/\)','bWp') == 1 && s:SynAt(l:n,1) =~? s:syng_com
+        let [l:multi, l:n] = [1, line('.')]
+        continue
+      endif
     endif
-    let l:lnum = prevnonblank(l:lnum - 1)
+    break
   endwhile
+  call setpos('.',l:pos)
+  return l:n
 endfunction
 
 " Check if line 'lnum' has a balanced amount of parentheses.
 function s:Balanced(lnum)
-  let l:open = 0
-  let l:line = getline(a:lnum)
-  let pos = match(l:line, '[][(){}]', 0)
+  let [l:open, l:line] = [0, getline(a:lnum)]
+  let pos = match(l:line, '[][(){}]')
   while pos != -1
-    if synIDattr(synID(a:lnum,pos + 1,0),'name') !~? s:syng_strcom
+    if s:SynAt(a:lnum,pos + 1) !~? b:syng_strcom
       let l:open += match(' ' . l:line[pos],'[[({]')
       if l:open < 0
         return
       endif
     endif
-    let pos = match(l:line, '[][(){}]', pos + 1)
+    let pos = match(l:line, l:open ?
+          \ matchstr(['[][]','[()]','[{}]'],l:line[pos]) :
+          \ '[][(){}]', pos + 1)
   endwhile
   return !l:open
 endfunction
 
+function s:OneScope(lnum)
+  call cursor(a:lnum, len(s:Trim(a:lnum)))
+  if s:LookingAt() == ')' && s:GetPair('(', ')', 'bW', s:skip_expr, 100)
+    let tok = s:PreviousToken()
+    return (tok =~# '^\%(for\|if\|let\|while\|with\)$' ||
+          \ tok =~# '^await$\|^each$' && s:PreviousToken() ==# 'for') &&
+          \ s:Pure('s:PreviousToken') != '.' && !(tok == 'while' && s:DoWhile())
+  elseif s:Token() =~# '^else$\|^do$'
+    return s:Pure('s:PreviousToken') != '.'
+  endif
+  return strpart(getline('.'),col('.')-2,2) == '=>'
+endfunction
+
+function s:DoWhile()
+  let cpos = searchpos('\m\<','cbW')
+  if s:SearchLoop('\m\C[{}]\|\<\%(do\|while\)\>','bW',s:skip_expr)
+    if s:{s:LookingAt() == '}' && s:GetPair('{','}','bW',s:skip_expr,200) ?
+          \ 'Previous' : ''}Token() ==# 'do' && s:IsBlock()
+      return 1
+    endif
+    call call('cursor',cpos)
+  endif
+endfunction
+
+" returns braceless levels started by 'i' and above lines * &sw. 'num' is the
+" lineNr which encloses the entire context, 'cont' if whether line 'i' + 1 is
+" a continued expression, which could have started in a braceless context
+function s:IsContOne(i,num,cont)
+  let [l:i, l:num, b_l] = [a:i, a:num + !a:num, 0]
+  let pind = a:num ? indent(a:num) + s:sw() : 0
+  let ind = indent(a:i) + (a:cont ? 0 : s:sw())
+  while l:i > l:num && ind > pind || l:i == l:num
+    if indent(l:i) < ind && s:OneScope(l:i)
+      let b_l += 1
+      let l:i = line('.')
+    elseif !a:cont || b_l || ind < indent(a:i)
+      break
+    endif
+    let ind = min([ind, indent(l:i)])
+    let l:i = s:PrevCodeLine(l:i - 1)
+  endwhile
+  return b_l
+endfunction
+
+function s:IsSwitch()
+  return s:PreviousToken() !~ '[.*]' &&
+        \ (!s:GetPair('{','}','cbW',s:skip_expr,100) || s:IsBlock() &&
+        \ (s:Token() !~ '^\K\k*$' || expand('<cword>') !=# 'class' &&
+        \ s:PreviousToken() !~# '^class$\|^extends$' || s:PreviousToken() == '.'))
+endfunction
+
+" https://github.com/sweet-js/sweet.js/wiki/design#give-lookbehind-to-the-reader
+function s:IsBlock()
+  let l:n = line('.')
+  let tok = s:PreviousToken()
+  if match(s:stack,'\cxml\|jsx') != -1 && s:SynAt(line('.'),col('.')-1) =~? 'xml\|jsx'
+    return tok != '{'
+  elseif tok =~ '\k'
+    if tok ==# 'type'
+      return s:Pure('eval',"s:PreviousToken() !~# '^\\%(im\\|ex\\)port$' || s:PreviousToken() == '.'")
+    endif
+    return index(split('return const let import export extends yield default delete var await void typeof throw case new of in instanceof')
+          \ ,tok) < (line('.') != l:n) || s:Pure('s:PreviousToken') == '.'
+  elseif tok == '>'
+    return getline('.')[col('.')-2] == '=' || s:SynAt(line('.'),col('.')) =~? 'jsflow\|^html'
+  elseif tok == '*'
+    return s:Pure('s:PreviousToken') == ':'
+  elseif tok == ':'
+    return !s:ExprCol()
+  elseif tok == '/'
+    return s:SynAt(line('.'),col('.')) =~? 'regex'
+  elseif tok !~ '[=~!<,.?^%|&([]'
+    return tok !~ '[-+]' || l:n != line('.') && getline('.')[col('.')-2] == tok
+  endif
+endfunction
+
 function GetJavascriptIndent()
-  let b:js_cache = get(b:,'js_cache',[0,0,0])
-  " Get the current line.
-  let l:line = getline(v:lnum)
-  let syns = synIDattr(synID(v:lnum, 1, 0), 'name')
+  let [b:js_cache, s:synid_cache, l:line, s:stack] = [
+        \ get(b:,'js_cache',[0,0,0]),
+        \ [[],[]],
+        \ getline(v:lnum),
+        \ map(synstack(v:lnum,1),"synIDattr(v:val,'name')"),
+        \ ]
+  " use synstack as it validates syn state and works in an empty line
+  let syns = get(s:stack,-1,'')
 
   " start with strings,comments,etc.
-  if syns =~? 'comment\|doc'
+  if syns =~? s:syng_com
     if l:line =~ '^\s*\*'
       return cindent(v:lnum)
-    elseif l:line !~ '^\s*\/'
+    elseif l:line !~ '^\s*\/[/*]'
       return -1
     endif
-  elseif syns =~? 'string\|template' && l:line !~ '^[''"]'
+  elseif syns =~? b:syng_str
+    if b:js_cache[0] == v:lnum - 1 && s:Balanced(v:lnum-1)
+      let b:js_cache[0] = v:lnum
+    endif
     return -1
   endif
   let l:lnum = s:PrevCodeLine(v:lnum - 1)
@@ -199,63 +391,97 @@ function GetJavascriptIndent()
     return
   endif
 
-  let l:line = substitute(substitute(l:line,'^\s*\%(\/\*.\{-}\*\/\s*\)*','',''),'^\/[/*].*','','')
-
-  " the containing paren, bracket, curly. Many hacks for performance
-  call cursor(v:lnum,1)
-  let idx = strlen(l:line) ? stridx('])}',l:line[0]) : -1
-  if indent(l:lnum)
-    let [s:looksyn,s:free] = [v:lnum - 1,1]
-    if b:js_cache[0] >= l:lnum && b:js_cache[0] < v:lnum &&
-          \ (b:js_cache[0] > l:lnum || s:Balanced(l:lnum))
-      call call('cursor',b:js_cache[1:])
-    elseif idx + 1
-      call s:GetPair(['\[','(','{'][idx], '])}'[idx],'bW','s:skip_func(s:looksyn)',2000)
-    elseif indent(v:lnum) && syns =~? 'block'
-      call s:GetPair('{','}','bW','s:skip_func(s:looksyn)',2000)
-    else
-      call s:GetPair('[({[]','[])}]','bW','s:skip_func(s:looksyn)',2000)
-    endif
-  else
-    call s:GetPair('[({[]','[])}]','bW',s:skip_expr,200,l:lnum)
+  let l:line = substitute(l:line,'^\s*','','')
+  let l:line_raw = l:line
+  if l:line[:1] == '/*'
+    let l:line = substitute(l:line,'^\%(\/\*.\{-}\*\/\s*\)*','','')
+  endif
+  if l:line =~ '^\/[/*]'
+    let l:line = ''
   endif
 
-  if idx + 1
-    if idx == 2 && search('\S','bW',line('.')) && s:current_char() == ')'
-      call s:GetPair('(',')','bW',s:skip_expr,200)
-    endif
-    return indent(line('.'))
+  " the containing paren, bracket, or curly. Many hacks for performance
+  let [ s:script_tag, idx ] = [ get(get(b:,'hi_indent',{}),'blocklnr'),
+        \ index([']',')','}'],l:line[0]) ]
+  if b:js_cache[0] > l:lnum && b:js_cache[0] < v:lnum ||
+        \ b:js_cache[0] == l:lnum && s:Balanced(l:lnum)
+    call call('cursor',b:js_cache[2] ? b:js_cache[1:] : [v:lnum,1])
+  else
+    call cursor(v:lnum,1)
+    let [s:looksyn, s:check_in, s:top_col] = [v:lnum - 1, 0, 0]
+    try
+      if idx != -1
+        call s:GetPair('[({'[idx],'])}'[idx],'bW','s:SkipFunc()',2000,s:script_tag)
+      elseif getline(v:lnum) !~ '^\S' && syns =~? 'block'
+        call s:GetPair('{','}','bW','s:SkipFunc()',2000,s:script_tag)
+      else
+        call s:AlternatePair()
+      endif
+    catch
+      call cursor(v:lnum,1)
+    endtry
   endif
 
-  let b:js_cache = [v:lnum] + (line('.') == v:lnum ? [0,0] : [line('.'),col('.')])
+  let b:js_cache = [v:lnum] + (line('.') == v:lnum ? [s:script_tag,0] : getpos('.')[1:2])
   let num = b:js_cache[1]
 
-  let [s:W, pline, isOp, stmt, bL, switch_offset] = [s:sw(), s:Trim(l:lnum),0,0,0,0]
-  if num && s:current_char() == '{' && s:IsBlock()
-    let stmt = 1
-    if s:current_char() == ')' && s:GetPair('(', ')', 'bW', s:skip_expr, 100) > 0 && s:previous_token() ==# 'switch'
-      let switch_offset = &cino !~ ':' || !has('float') ? s:W :
-            \ float2nr(str2float(matchstr(&cino,'.*:\zs[-0-9.]*')) * (&cino =~# '\%(.*:\)\@>[^,]*s' ? s:W : 1))
-      if l:line =~# '^' . s:case_stmt
-        return indent(num) + switch_offset
+  let [num_ind, is_op, b_l, l:switch_offset] = [s:Nat(indent(num)),0,0,0]
+  if !b:js_cache[2] || s:LookingAt() == '{' && s:IsBlock()
+    let [ilnum, pline] = [line('.'), s:Trim(l:lnum)]
+    if b:js_cache[2] && s:LookingAt() == ')' && s:GetPair('(',')','bW',s:skip_expr,100)
+      if ilnum == num
+        let [num, num_ind] = [line('.'), indent('.')]
+      endif
+      if idx == -1 && s:PreviousToken() ==# 'switch' && s:IsSwitch()
+        let l:switch_offset = &cino !~ ':' ? s:sw() : s:ParseCino(':')
+        if pline[-1:] != '.' && l:line =~# '^\%(default\|case\)\>'
+          return s:Nat(num_ind + l:switch_offset)
+        elseif &cino =~ '='
+          let l:case_offset = s:ParseCino('=')
+        endif
       endif
-      let stmt = pline !~# s:case_stmt . '$'
     endif
-  endif
-
-  if stmt || !num
-    let isOp = l:line =~# s:opfirst || pline =~# s:continuation
-    let bL = s:iscontOne(l:lnum,num,isOp)
-    let bL -= (bL && l:line[0] == '{') * s:W
+    if idx == -1 && pline[-1:] !~ '[{;]'
+      let sol = matchstr(l:line,s:opfirst)
+      if sol =~# '^\%(in\%(stanceof\)\=\|\*\)$'
+        call cursor(l:lnum, len(pline))
+        if pline[-1:] == '}' && s:GetPair('{','}','bW',s:skip_expr,200) && s:IsBlock()
+          return num_ind + s:sw()
+        endif
+        let is_op = s:sw()
+      elseif sol isnot '' || s:Continues(l:lnum,pline)
+        let is_op = s:sw()
+      endif
+      let b_l = s:Nat(s:IsContOne(l:lnum,b:js_cache[1],is_op) -
+            \ (!is_op && l:line =~ '^{')) * s:sw()
+    endif
+  elseif idx == -1 && getline(b:js_cache[1])[b:js_cache[2]-1] == '(' && &cino =~ '(' &&
+        \ (search('\m\S','nbW',num) || s:ParseCino('U'))
+    let pval = s:ParseCino('(')
+    if !pval
+      let [Wval, vcol] = [s:ParseCino('W'), virtcol('.')]
+      if search('\m\S','W',num)
+        return s:ParseCino('w') ? vcol : virtcol('.')-1
+      endif
+      return Wval ? s:Nat(num_ind + Wval) : vcol
+    endif
+    return s:Nat(num_ind + pval + s:GetPair('(',')','nbrmW',s:skip_expr,100,num) * s:sw())
   endif
 
   " main return
-  if isOp
-    return (num ? indent(num) : -s:W) + (s:W * 2) + switch_offset + bL
+  if l:line =~ '^[])}]\|^|}'
+    if l:line_raw[0] == ')' && getline(b:js_cache[1])[b:js_cache[2]-1] == '('
+      if s:ParseCino('M')
+        return indent(l:lnum)
+      elseif &cino =~# 'm' && !s:ParseCino('m')
+        return virtcol('.') - 1
+      endif
+    endif
+    return num_ind
   elseif num
-    return indent(num) + s:W + switch_offset + bL
+    return s:Nat(num_ind + get(l:,'case_offset',s:sw()) + l:switch_offset + b_l + is_op)
   endif
-  return bL
+  return b_l + is_op
 endfunction
 
 let &cpo = s:cpo_save
diff --git a/syntax/javascript.vim b/syntax/javascript.vim
index 22733c7..a238c8e 100644
--- a/syntax/javascript.vim
+++ b/syntax/javascript.vim
@@ -24,53 +24,55 @@ syntax sync fromstart
 " syntax case ignore
 syntax case match
 
-syntax match   jsNoise          /[:,\;\.]\{1}/
+syntax match   jsNoise          /[:,\;]\{1}/
+syntax match   jsNoise          /[\.]\{1}/ skipwhite skipempty nextgroup=jsObjectProp,jsFuncCall,jsPrototype,jsTaggedTemplate
+syntax match   jsObjectProp     contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>/
 syntax match   jsFuncCall       /\k\+\%(\s*(\)\@=/
 syntax match   jsParensError    /[)}\]]/
 
 " Program Keywords
 syntax keyword jsStorageClass   const var let skipwhite skipempty nextgroup=jsDestructuringBlock,jsDestructuringArray,jsVariableDef
-syntax match   jsVariableDef    contained /\k\+/ nextgroup=jsFlowDefinition
-syntax keyword jsOperator       delete instanceof typeof void new in of
-syntax match   jsOperator       /[\!\|\&\+\-\<\>\=\%\/\*\~\^]\{1}/
+syntax match   jsVariableDef    contained /\k\+/ skipwhite skipempty nextgroup=jsFlowDefinition
+syntax keyword jsOperator       delete instanceof typeof void new in of skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsOperator       /[\!\|\&\+\-\<\>\=\%\/\*\~\^]\{1}/ skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsOperator       /::/ skipwhite skipempty nextgroup=@jsExpression
 syntax keyword jsBooleanTrue    true
 syntax keyword jsBooleanFalse   false
 
 " Modules
-syntax keyword jsModuleKeywords  contained import
-syntax keyword jsModuleKeywords  contained export skipwhite skipempty nextgroup=jsExportBlock,jsModuleDefault
-syntax keyword jsModuleOperators contained from
-syntax keyword jsModuleOperators contained as
-syntax region  jsModuleGroup     contained matchgroup=jsModuleBraces start=/{/ end=/}/ contains=jsModuleOperators,jsNoise,jsComment
-syntax match   jsModuleAsterisk  contained /*/
-syntax keyword jsModuleDefault   contained default skipwhite skipempty nextgroup=@jsExpression
-syntax region  jsImportContainer start=/\<import\> / end="\%(;\|$\)" contains=jsModuleKeywords,jsModuleOperators,jsComment,jsString,jsTemplateString,jsNoise,jsModuleGroup,jsModuleAsterisk
-syntax region  jsExportContainer start=/\<export\> / end="\%(;\|$\)" contains=jsModuleKeywords,jsModuleOperators,jsStorageClass,jsModuleDefault,@jsExpression
-syntax region  jsExportBlock     contained matchgroup=jsExportBraces start=/{/ end=/}/ contains=jsModuleOperators,jsNoise,jsComment
+syntax keyword jsImport                       import skipwhite skipempty nextgroup=jsModuleAsterisk,jsModuleKeyword,jsModuleGroup,jsFlowImportType
+syntax keyword jsExport                       export skipwhite skipempty nextgroup=@jsAll,jsModuleGroup,jsExportDefault,jsModuleAsterisk,jsModuleKeyword,jsFlowTypeStatement
+syntax match   jsModuleKeyword      contained /\k\+/ skipwhite skipempty nextgroup=jsModuleAs,jsFrom,jsModuleComma
+syntax keyword jsExportDefault      contained default skipwhite skipempty nextgroup=@jsExpression
+syntax keyword jsExportDefaultGroup contained default skipwhite skipempty nextgroup=jsModuleAs,jsFrom,jsModuleComma
+syntax match   jsModuleAsterisk     contained /\*/ skipwhite skipempty nextgroup=jsModuleKeyword,jsModuleAs,jsFrom
+syntax keyword jsModuleAs           contained as skipwhite skipempty nextgroup=jsModuleKeyword,jsExportDefaultGroup
+syntax keyword jsFrom               contained from skipwhite skipempty nextgroup=jsString
+syntax match   jsModuleComma        contained /,/ skipwhite skipempty nextgroup=jsModuleKeyword,jsModuleAsterisk,jsModuleGroup,jsFlowTypeKeyword
 
 " Strings, Templates, Numbers
 syntax region  jsString           start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend
 syntax region  jsString           start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend
-syntax region  jsTemplateString   start=+`+  skip=+\\\(`\|$\)+  end=+`+     contains=jsTemplateVar,jsSpecial extend
+syntax region  jsTemplateString   start=+`+  skip=+\\\(`\|$\)+  end=+`+     contains=jsTemplateExpression,jsSpecial,@Spell extend
 syntax match   jsTaggedTemplate   /\k\+\%(`\)\@=/ nextgroup=jsTemplateString
 syntax match   jsNumber           /\<\d\+\%([eE][+-]\=\d\+\)\=\>\|\<0[bB][01]\+\>\|\<0[oO]\o\+\>\|\<0[xX]\x\+\>/
 syntax keyword jsNumber           Infinity
 syntax match   jsFloat            /\<\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%([eE][+-]\=\d\+\)\=\>/
 
 " Regular Expressions
-syntax match   jsSpecial          contained "\v\\%(0|\\x\x\{2\}\|\\u\x\{4\}\|\c[A-Z]|.)"
-syntax region  jsTemplateVar      contained matchgroup=jsTemplateBraces start=+${+ end=+}+ contains=@jsExpression
-syntax region  jsRegexpCharClass  contained start=+\[+ skip=+\\.+ end=+\]+
-syntax match   jsRegexpBoundary   contained "\v%(\<@![\^$]|\\[bB])"
-syntax match   jsRegexpBackRef    contained "\v\\[1-9][0-9]*"
-syntax match   jsRegexpQuantifier contained "\v\\@<!%([?*+]|\{\d+%(,|,\d+)?})\??"
-syntax match   jsRegexpOr         contained "\v\<@!\|"
-syntax match   jsRegexpMod        contained "\v\(@<=\?[:=!>]"
-syntax region  jsRegexpGroup      contained start="\\\@<!(" skip="\\.\|\[\(\\.\|[^]]\)*\]" end="\\\@<!)" contains=jsRegexpCharClass,@jsRegexpSpecial keepend
+syntax match   jsSpecial            contained "\v\\%(0|\\x\x\{2\}\|\\u\x\{4\}\|\c[A-Z]|.)"
+syntax region  jsTemplateExpression contained matchgroup=jsTemplateBraces start=+${+ end=+}+ contains=@jsExpression keepend
+syntax region  jsRegexpCharClass    contained start=+\[+ skip=+\\.+ end=+\]+
+syntax match   jsRegexpBoundary     contained "\v%(\<@![\^$]|\\[bB])"
+syntax match   jsRegexpBackRef      contained "\v\\[1-9][0-9]*"
+syntax match   jsRegexpQuantifier   contained "\v\\@<!%([?*+]|\{\d+%(,|,\d+)?})\??"
+syntax match   jsRegexpOr           contained "\v\<@!\|"
+syntax match   jsRegexpMod          contained "\v\(@<=\?[:=!>]"
+syntax region  jsRegexpGroup        contained start="\\\@<!(" skip="\\.\|\[\(\\.\|[^]]\)*\]" end="\\\@<!)" contains=jsRegexpCharClass,@jsRegexpSpecial keepend
 if v:version > 703 || v:version == 603 && has("patch1088")
-  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@50<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@50<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimy]\{,4}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
+  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@50<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@50<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
 else
-  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimy]\{,4}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
+  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
 endif
 syntax cluster jsRegexpSpecial    contains=jsSpecial,jsRegexpBoundary,jsRegexpBackRef,jsRegexpQuantifier,jsRegexpOr,jsRegexpMod
 
@@ -81,15 +83,15 @@ syntax region  jsObjectKeyString   contained start=+"+  skip=+\\\("\|$\)+  end=+
 syntax region  jsObjectKeyString   contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell skipwhite skipempty nextgroup=jsObjectValue
 syntax region  jsObjectKeyComputed contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsObjectValue,jsFuncArgs extend
 syntax match   jsObjectSeparator   contained /,/
-syntax region  jsObjectValue       contained start=/:/ end=/\%(,\|}\)\@=/ contains=jsObjectColon,@jsExpression extend
+syntax region  jsObjectValue       contained matchgroup=jsNoise start=/:/ end=/\%(,\|}\)\@=/ contains=@jsExpression extend
 syntax match   jsObjectFuncName    contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>[\r\n\t ]*(\@=/ skipwhite skipempty nextgroup=jsFuncArgs
 syntax match   jsFunctionKey       contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\(\s*:\s*function\s*\)\@=/
-syntax match   jsObjectMethodType  contained /\%(get\|set\|static\|async\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsObjectFuncName
+syntax match   jsObjectMethodType  contained /\%(get\|set\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsObjectFuncName
 syntax region  jsObjectStringKey   contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs,jsObjectValue
 syntax region  jsObjectStringKey   contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs,jsObjectValue
 
 exe 'syntax keyword jsNull      null             '.(exists('g:javascript_conceal_null')      ? 'conceal cchar='.g:javascript_conceal_null       : '')
-exe 'syntax keyword jsReturn    return contained '.(exists('g:javascript_conceal_return')    ? 'conceal cchar='.g:javascript_conceal_return     : '')
+exe 'syntax keyword jsReturn    return contained '.(exists('g:javascript_conceal_return')    ? 'conceal cchar='.g:javascript_conceal_return     : '').' skipwhite skipempty nextgroup=@jsExpression'
 exe 'syntax keyword jsUndefined undefined        '.(exists('g:javascript_conceal_undefined') ? 'conceal cchar='.g:javascript_conceal_undefined  : '')
 exe 'syntax keyword jsNan       NaN              '.(exists('g:javascript_conceal_NaN')       ? 'conceal cchar='.g:javascript_conceal_NaN        : '')
 exe 'syntax keyword jsPrototype prototype        '.(exists('g:javascript_conceal_prototype') ? 'conceal cchar='.g:javascript_conceal_prototype  : '')
@@ -97,24 +99,27 @@ exe 'syntax keyword jsThis      this             '.(exists('g:javascript_conceal
 exe 'syntax keyword jsSuper     super  contained '.(exists('g:javascript_conceal_super')     ? 'conceal cchar='.g:javascript_conceal_super      : '')
 
 " Statement Keywords
-syntax keyword jsStatement    contained break continue with yield debugger
-syntax keyword jsConditional            if           skipwhite skipempty nextgroup=jsParenIfElse
-syntax keyword jsConditional            else         skipwhite skipempty nextgroup=jsCommentMisc,jsIfElseBlock
-syntax keyword jsConditional            switch       skipwhite skipempty nextgroup=jsParenSwitch
-syntax keyword jsRepeat                 while for    skipwhite skipempty nextgroup=jsParenRepeat,jsForAwait
-syntax keyword jsDo                     do           skipwhite skipempty nextgroup=jsRepeatBlock
-syntax keyword jsLabel        contained case default
-syntax keyword jsTry                    try          skipwhite skipempty nextgroup=jsTryCatchBlock
-syntax keyword jsFinally      contained finally      skipwhite skipempty nextgroup=jsFinallyBlock
-syntax keyword jsCatch        contained catch        skipwhite skipempty nextgroup=jsParenCatch
+syntax match   jsBlockLabel              /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\s*::\@!/    contains=jsNoise skipwhite skipempty nextgroup=jsBlock
+syntax match   jsBlockLabelKey contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\%(\s*\%(;\|\n\)\)\@=/
+syntax keyword jsStatement    contained with yield debugger
+syntax keyword jsStatement    contained break continue skipwhite skipempty nextgroup=jsBlockLabelKey
+syntax keyword jsConditional            if             skipwhite skipempty nextgroup=jsParenIfElse
+syntax keyword jsConditional            else           skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock
+syntax keyword jsConditional            switch         skipwhite skipempty nextgroup=jsParenSwitch
+syntax keyword jsRepeat                 while for      skipwhite skipempty nextgroup=jsParenRepeat,jsForAwait
+syntax keyword jsDo                     do             skipwhite skipempty nextgroup=jsRepeatBlock
+syntax region  jsSwitchCase   contained matchgroup=jsLabel start=/\<\%(case\|default\)\>/ end=/:\@=/ contains=@jsExpression,jsLabel skipwhite skipempty nextgroup=jsSwitchColon keepend
+syntax keyword jsTry                    try            skipwhite skipempty nextgroup=jsTryCatchBlock
+syntax keyword jsFinally      contained finally        skipwhite skipempty nextgroup=jsFinallyBlock
+syntax keyword jsCatch        contained catch          skipwhite skipempty nextgroup=jsParenCatch
 syntax keyword jsException              throw
 syntax keyword jsAsyncKeyword           async await
-syntax match   jsSwitchColon  contained /:/          skipwhite skipempty nextgroup=jsSwitchBlock
+syntax match   jsSwitchColon   contained /::\@!/       skipwhite skipempty nextgroup=jsSwitchBlock
 
 " Keywords
 syntax keyword jsGlobalObjects      Array Boolean Date Function Iterator Number Object Symbol Map WeakMap Set RegExp String Proxy Promise Buffer ParallelArray ArrayBuffer DataView Float32Array Float64Array Int16Array Int32Array Int8Array Uint16Array Uint32Array Uint8Array Uint8ClampedArray JSON Math console document window Intl Collator DateTimeFormat NumberFormat fetch
-syntax keyword jsGlobalNodeObjects  module exports global process
-syntax match   jsGlobalNodeObjects  /require/ containedin=jsFuncCall
+syntax keyword jsGlobalNodeObjects  module exports global process __dirname __filename
+syntax match   jsGlobalNodeObjects  /\<require\>/ containedin=jsFuncCall
 syntax keyword jsExceptions         Error EvalError InternalError RangeError ReferenceError StopIteration SyntaxError TypeError URIError
 syntax keyword jsBuiltins           decodeURI decodeURIComponent encodeURI encodeURIComponent eval isFinite isNaN parseFloat parseInt uneval
 " DISCUSS: How imporant is this, really? Perhaps it should be linked to an error because I assume the keywords are reserved?
@@ -135,29 +140,29 @@ syntax keyword jsDomNodeConsts  ELEMENT_NODE ATTRIBUTE_NODE TEXT_NODE CDATA_SECT
 syntax keyword jsHtmlEvents     onblur onclick oncontextmenu ondblclick onfocus onkeydown onkeypress onkeyup onmousedown onmousemove onmouseout onmouseover onmouseup onresize
 
 " Code blocks
-syntax region  jsBracket                      matchgroup=jsBrackets            start=/\[/ end=/\]/ contains=@jsExpression extend fold
-syntax region  jsParen                        matchgroup=jsParens              start=/(/  end=/)/  contains=@jsAll extend fold
-syntax region  jsParenDecorator     contained matchgroup=jsParensDecorator     start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentMisc extend fold
-syntax region  jsParenIfElse        contained matchgroup=jsParensIfElse        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentMisc,jsIfElseBlock extend fold
-syntax region  jsParenRepeat        contained matchgroup=jsParensRepeat        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentMisc,jsRepeatBlock extend fold
+syntax region  jsBracket                      matchgroup=jsBrackets            start=/\[/ end=/\]/ contains=@jsExpression,jsSpreadExpression extend fold
+syntax region  jsParen                        matchgroup=jsParens              start=/(/  end=/)/  contains=@jsExpression extend fold nextgroup=jsFlowDefinition
+syntax region  jsParenDecorator     contained matchgroup=jsParensDecorator     start=/(/  end=/)/  contains=@jsAll extend fold
+syntax region  jsParenIfElse        contained matchgroup=jsParensIfElse        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentIfElse,jsIfElseBlock extend fold
+syntax region  jsParenRepeat        contained matchgroup=jsParensRepeat        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsCommentRepeat,jsRepeatBlock extend fold
 syntax region  jsParenSwitch        contained matchgroup=jsParensSwitch        start=/(/  end=/)/  contains=@jsAll skipwhite skipempty nextgroup=jsSwitchBlock extend fold
 syntax region  jsParenCatch         contained matchgroup=jsParensCatch         start=/(/  end=/)/  skipwhite skipempty nextgroup=jsTryCatchBlock extend fold
-syntax region  jsFuncArgs           contained matchgroup=jsFuncParens          start=/(/  end=/)/  contains=jsFuncArgCommas,jsComment,jsFuncArgExpression,jsDestructuringBlock,jsRestExpression,jsFlowArgumentDef skipwhite skipempty nextgroup=jsCommentFunction,jsFuncBlock,jsFlowReturn extend fold
-syntax region  jsClassBlock         contained matchgroup=jsClassBraces         start=/{/  end=/}/  contains=jsClassFuncName,jsClassMethodType,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator,jsClassProperty,jsClassPropertyComputed,jsClassStringKey,jsNoise extend fold
-syntax region  jsFuncBlock          contained matchgroup=jsFuncBraces          start=/{/  end=/}/  contains=@jsAll extend fold
-syntax region  jsIfElseBlock        contained matchgroup=jsIfElseBraces        start=/{/  end=/}/  contains=@jsAll extend fold
-syntax region  jsBlock              contained matchgroup=jsBraces              start=/{/  end=/}/  contains=@jsAll extend fold
-syntax region  jsTryCatchBlock      contained matchgroup=jsTryCatchBraces      start=/{/  end=/}/  contains=@jsAll skipwhite skipempty nextgroup=jsCatch,jsFinally extend fold
-syntax region  jsFinallyBlock       contained matchgroup=jsFinallyBraces       start=/{/  end=/}/  contains=@jsAll extend fold
-syntax region  jsSwitchBlock        contained matchgroup=jsSwitchBraces        start=/{/  end=/}/  contains=@jsAll,jsLabel,jsSwitchColon extend fold
-syntax region  jsRepeatBlock        contained matchgroup=jsRepeatBraces        start=/{/  end=/}/  contains=@jsAll extend fold
-syntax region  jsDestructuringBlock contained matchgroup=jsDestructuringBraces start=/{/  end=/}/  contains=jsDestructuringProperty,jsDestructuringAssignment,jsDestructuringNoise,jsDestructuringPropertyComputed,jsSpreadExpression extend fold
-syntax region  jsDestructuringArray contained matchgroup=jsDestructuringBraces start=/\[/ end=/\]/ contains=jsDestructuringPropertyValue,jsNoise,jsDestructuringProperty,jsSpreadExpression extend fold
-syntax region  jsObject                       matchgroup=jsObjectBraces        start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsDecorator extend fold
-syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?/  end=/\%(:\|[\}]\@=\)/  contains=@jsExpression
+syntax region  jsFuncArgs           contained matchgroup=jsFuncParens          start=/(/  end=/)/  contains=jsFuncArgCommas,jsComment,jsFuncArgExpression,jsDestructuringBlock,jsDestructuringArray,jsRestExpression,jsFlowArgumentDef skipwhite skipempty nextgroup=jsCommentFunction,jsFuncBlock,jsFlowReturn extend fold
+syntax region  jsClassBlock         contained matchgroup=jsClassBraces         start=/{/  end=/}/  contains=jsClassFuncName,jsClassMethodType,jsArrowFunction,jsArrowFuncArgs,jsComment,jsGenerator,jsDecorator,jsClassProperty,jsClassPropertyComputed,jsClassStringKey,jsAsyncKeyword,jsNoise extend fold
+syntax region  jsFuncBlock          contained matchgroup=jsFuncBraces          start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
+syntax region  jsIfElseBlock        contained matchgroup=jsIfElseBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
+syntax region  jsTryCatchBlock      contained matchgroup=jsTryCatchBraces      start=/{/  end=/}/  contains=@jsAll,jsBlock skipwhite skipempty nextgroup=jsCatch,jsFinally extend fold
+syntax region  jsFinallyBlock       contained matchgroup=jsFinallyBraces       start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
+syntax region  jsSwitchBlock        contained matchgroup=jsSwitchBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock,jsSwitchCase extend fold
+syntax region  jsRepeatBlock        contained matchgroup=jsRepeatBraces        start=/{/  end=/}/  contains=@jsAll,jsBlock extend fold
+syntax region  jsDestructuringBlock contained matchgroup=jsDestructuringBraces start=/{/  end=/}/  contains=jsDestructuringProperty,jsDestructuringAssignment,jsDestructuringNoise,jsDestructuringPropertyComputed,jsSpreadExpression,jsComment extend fold
+syntax region  jsDestructuringArray contained matchgroup=jsDestructuringBraces start=/\[/ end=/\]/ contains=jsDestructuringPropertyValue,jsNoise,jsDestructuringProperty,jsSpreadExpression,jsComment extend fold
+syntax region  jsObject             contained matchgroup=jsObjectBraces        start=/{/  end=/}/  contains=jsObjectKey,jsObjectKeyString,jsObjectKeyComputed,jsObjectSeparator,jsObjectFuncName,jsObjectMethodType,jsGenerator,jsComment,jsObjectStringKey,jsSpreadExpression,jsDecorator,jsAsyncKeyword extend fold
+syntax region  jsBlock                        matchgroup=jsBraces              start=/{/  end=/}/  contains=@jsAll,jsSpreadExpression extend fold
+syntax region  jsModuleGroup        contained matchgroup=jsModuleBraces        start=/{/ end=/}/   contains=jsModuleKeyword,jsModuleComma,jsModuleAs,jsComment,jsFlowTypeKeyword skipwhite skipempty nextgroup=jsFrom fold
 syntax region  jsSpreadExpression   contained matchgroup=jsSpreadOperator      start=/\.\.\./ end=/[,}\]]\@=/ contains=@jsExpression
 syntax region  jsRestExpression     contained matchgroup=jsRestOperator        start=/\.\.\./ end=/[,)]\@=/
-syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?/  end=/\%(:\|[\}]\@=\)/  contains=@jsExpression
+syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?/  end=/\%(:\|[\}]\@=\)/  contains=@jsExpression extend skipwhite skipempty nextgroup=@jsExpression
 
 syntax match   jsGenerator            contained /\*/ skipwhite skipempty nextgroup=jsFuncName,jsFuncArgs
 syntax match   jsFuncName             contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>/ skipwhite skipempty nextgroup=jsFuncArgs,jsFlowFunctionGroup
@@ -173,13 +178,16 @@ syntax match   jsArrowFuncArgs  /([^()]*)\s*\(=>\)\@=/ contains=jsFuncArgs skipe
 
 exe 'syntax match jsFunction /\<function\>/ skipwhite skipempty nextgroup=jsGenerator,jsFuncName,jsFuncArgs skipwhite '.(exists('g:javascript_conceal_function')       ? 'conceal cchar='.g:javascript_conceal_function : '')
 exe 'syntax match jsArrowFunction /=>/      skipwhite skipempty nextgroup=jsFuncBlock,jsCommentFunction               '.(exists('g:javascript_conceal_arrow_function') ? 'conceal cchar='.g:javascript_conceal_arrow_function : '')
+exe 'syntax match jsArrowFunction /()\s*\(=>\)\@=/   skipwhite skipempty nextgroup=jsArrowFunction                    '.(exists('g:javascript_conceal_noarg_arrow_function') ? 'conceal cchar='.g:javascript_conceal_noarg_arrow_function : '').(' contains=jsArrowFuncArgs')
+exe 'syntax match jsArrowFunction /_\s*\(=>\)\@=/    skipwhite skipempty nextgroup=jsArrowFunction                    '.(exists('g:javascript_conceal_underscore_arrow_function') ? 'conceal cchar='.g:javascript_conceal_underscore_arrow_function : '')
 
 " Classes
-syntax keyword jsClassKeywords          contained extends class
+syntax keyword jsClassKeyword           contained class
+syntax keyword jsExtendsKeyword         contained extends skipwhite skipempty nextgroup=@jsExpression
 syntax match   jsClassNoise             contained /\./
-syntax match   jsClassMethodType        contained /\%(get\|set\|static\|async\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsFuncName,jsClassProperty
-syntax match   jsClassDefinition        /\<class\>\%( [a-zA-Z_$][0-9a-zA-Z_$ \n.]*\)*/ contains=jsClassKeywords,jsClassNoise skipwhite skipempty nextgroup=jsCommentClass,jsClassBlock,jsFlowClassGroup
-syntax match   jsClassProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsClassValue
+syntax match   jsClassMethodType        contained /\%(get\|set\|static\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsAsyncKeyword,jsFuncName,jsClassProperty
+syntax region  jsClassDefinition                  start=/\<class\>/ end=/\(\<extends\>\s\+\)\@<!{\@=/ contains=jsClassKeyword,jsExtendsKeyword,jsClassNoise,@jsExpression,jsFlowClassGroup skipwhite skipempty nextgroup=jsCommentClass,jsClassBlock,jsFlowClassGroup
+syntax match   jsClassProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*[=:]\)\@=/ skipwhite skipempty nextgroup=jsClassValue,jsFlowClassDef
 syntax region  jsClassValue             contained start=/=/ end=/\%(;\|}\|\n\)\@=/ contains=@jsExpression
 syntax region  jsClassPropertyComputed  contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsFuncArgs,jsClassValue extend
 syntax match   jsClassFuncName          contained /\<[a-zA-Z_$][0-9a-zA-Z_$]*\>\%(\s*(\)\@=/ skipwhite skipempty nextgroup=jsFuncArgs
@@ -208,8 +216,10 @@ syntax region  jsCommentFunction    contained start=/\/\// end=/$/    contains=j
 syntax region  jsCommentFunction    contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn fold extend keepend
 syntax region  jsCommentClass       contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup extend keepend
 syntax region  jsCommentClass       contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsClassBlock,jsFlowClassGroup fold extend keepend
-syntax region  jsCommentMisc        contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsBlock extend keepend
-syntax region  jsCommentMisc        contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsBlock fold extend keepend
+syntax region  jsCommentIfElse      contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock extend keepend
+syntax region  jsCommentIfElse      contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsIfElseBlock fold extend keepend
+syntax region  jsCommentRepeat      contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock extend keepend
+syntax region  jsCommentRepeat      contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsRepeatBlock fold extend keepend
 
 " Decorators
 syntax match   jsDecorator                    /^\s*@/ nextgroup=jsDecoratorFunction
@@ -227,8 +237,8 @@ if exists("javascript_plugin_flow")
   runtime extras/flow.vim
 endif
 
-syntax cluster jsExpression  contains=jsBracket,jsParen,jsObject,jsBlock,jsTernaryIf,jsTaggedTemplate,jsTemplateString,jsString,jsRegexpString,jsNumber,jsFloat,jsOperator,jsBooleanTrue,jsBooleanFalse,jsNull,jsFunction,jsArrowFunction,jsGlobalObjects,jsExceptions,jsFutureKeys,jsDomErrNo,jsDomNodeConsts,jsHtmlEvents,jsFuncCall,jsUndefined,jsNan,jsPrototype,jsBuiltins,jsNoise,jsClassDefinition,jsArrowFunction,jsArrowFuncArgs,jsParensError,jsComment,jsArguments,jsThis,jsSuper,jsDo
-syntax cluster jsAll         contains=@jsExpression,jsExportContainer,jsImportContainer,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsStatement,jsException,jsTry,jsAsyncKeyword
+syntax cluster jsExpression  contains=jsBracket,jsParen,jsObject,jsTernaryIf,jsTaggedTemplate,jsTemplateString,jsString,jsRegexpString,jsNumber,jsFloat,jsOperator,jsBooleanTrue,jsBooleanFalse,jsNull,jsFunction,jsArrowFunction,jsGlobalObjects,jsExceptions,jsFutureKeys,jsDomErrNo,jsDomNodeConsts,jsHtmlEvents,jsFuncCall,jsUndefined,jsNan,jsPrototype,jsBuiltins,jsNoise,jsClassDefinition,jsArrowFunction,jsArrowFuncArgs,jsParensError,jsComment,jsArguments,jsThis,jsSuper,jsDo,jsForAwait,jsAsyncKeyword
+syntax cluster jsAll         contains=@jsExpression,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsStatement,jsException,jsTry,jsNoise,jsBlockLabel
 
 " Define the default highlighting.
 " For version 5.7 and earlier: only when not done already
@@ -290,7 +300,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsOperator             Operator
   HiLink jsOf                   Operator
   HiLink jsStorageClass         StorageClass
-  HiLink jsClassKeywords        Keyword
+  HiLink jsClassKeyword         Keyword
+  HiLink jsExtendsKeyword       Keyword
   HiLink jsThis                 Special
   HiLink jsSuper                Constant
   HiLink jsNan                  Number
@@ -309,30 +320,32 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsFuncParens           Noise
   HiLink jsClassBraces          Noise
   HiLink jsClassNoise           Noise
-  HiLink jsIfElseBraces         jsBraces
-  HiLink jsTryCatchBraces       jsBraces
-  HiLink jsModuleBraces         jsBraces
+  HiLink jsIfElseBraces         Noise
+  HiLink jsTryCatchBraces       Noise
+  HiLink jsModuleBraces         Noise
   HiLink jsObjectBraces         Noise
   HiLink jsObjectSeparator      Noise
-  HiLink jsFinallyBraces        jsBraces
-  HiLink jsRepeatBraces         jsBraces
-  HiLink jsSwitchBraces         jsBraces
-  HiLink jsExportBraces         jsBraces
+  HiLink jsFinallyBraces        Noise
+  HiLink jsRepeatBraces         Noise
+  HiLink jsSwitchBraces         Noise
   HiLink jsSpecial              Special
-  HiLink jsTemplateVar          Special
-  HiLink jsTemplateBraces       jsBraces
+  HiLink jsTemplateBraces       Noise
   HiLink jsGlobalObjects        Constant
   HiLink jsGlobalNodeObjects    Constant
   HiLink jsExceptions           Constant
   HiLink jsBuiltins             Constant
-  HiLink jsModuleKeywords       Include
-  HiLink jsModuleOperators      Include
-  HiLink jsModuleDefault        Include
+  HiLink jsImport               Include
+  HiLink jsExport               Include
+  HiLink jsExportDefault        StorageClass
+  HiLink jsExportDefaultGroup   jsExportDefault
+  HiLink jsModuleAs             Include
+  HiLink jsModuleComma          jsNoise
+  HiLink jsModuleAsterisk       Noise
+  HiLink jsFrom                 Include
   HiLink jsDecorator            Special
   HiLink jsDecoratorFunction    Function
   HiLink jsParensDecorator      jsParens
   HiLink jsFuncArgOperator      jsFuncArgs
-  HiLink jsModuleAsterisk       Noise
   HiLink jsClassProperty        jsObjectKey
   HiLink jsSpreadOperator       Operator
   HiLink jsRestOperator         Operator
@@ -341,6 +354,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
   HiLink jsClassMethodType      Type
   HiLink jsObjectMethodType     Type
   HiLink jsClassDefinition      jsFuncName
+  HiLink jsBlockLabel           Identifier
+  HiLink jsBlockLabelKey        jsBlockLabel
 
   HiLink jsDestructuringBraces     Noise
   HiLink jsDestructuringProperty   jsFuncArgs
@@ -349,7 +364,8 @@ if version >= 508 || !exists("did_javascript_syn_inits")
 
   HiLink jsCommentFunction      jsComment
   HiLink jsCommentClass         jsComment
-  HiLink jsCommentMisc          jsComment
+  HiLink jsCommentIfElse        jsComment
+  HiLink jsCommentRepeat        jsComment
 
   HiLink jsDomErrNo             Constant
   HiLink jsDomNodeConsts        Constant
@@ -366,7 +382,7 @@ if version >= 508 || !exists("did_javascript_syn_inits")
 endif
 
 " Define the htmlJavaScript for HTML syntax html.vim
-syntax cluster  htmlJavaScript       contains=@jsAll
+syntax cluster  htmlJavaScript       contains=@jsAll,jsImport,jsExport
 syntax cluster  javaScriptExpression contains=@jsAll
 
 " Vim's default html.vim highlights all javascript as 'Special'