diff --git a/ISSUE_TEMPLATE.md b/ISSUE_TEMPLATE.md
index 155ea8d..b1ddccb 100644
--- a/ISSUE_TEMPLATE.md
+++ b/ISSUE_TEMPLATE.md
@@ -1,12 +1,13 @@
-If you are reporting an issue that involves any JSX (e.g.
-<div>{`${example}`}</div>), PLEASE PLEASE PLEASE make sure you have properly
+*Requisite minimal reproducible example, formatted as plain text :*
+
+<hr>
+
+#### Optional: concerning jsx.
+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 b60614f..b9ac49f 100644
--- a/README.md
+++ b/README.md
@@ -51,14 +51,16 @@ Default Value: 0
 
 -----------------
 
-```
-set foldmethod=syntax
+```vim
+augroup javascript_folding
+    au!
+    au FileType javascript setlocal foldmethod=syntax
+augroup END
 ```
 
-Enables code folding based on our syntax file.
+Enables code folding for javascript based on our syntax file.
 
-Please note this can have a dramatic effect on performance and because it is a
-global vim option, we do not set it ourselves.
+Please note this can have a dramatic effect on performance.
 
 
 ## Concealing Characters
diff --git a/indent/javascript.vim b/indent/javascript.vim
index e7334bf..d0ac384 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: August 12, 2017
+" Last Change: December 4, 2017
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -10,10 +10,6 @@ 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
@@ -25,13 +21,6 @@ setlocal indentkeys+=0],0)
 
 let b:undo_indent = 'setlocal indentexpr< smartindent< autoindent< indentkeys<'
 
-" 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')
   finish
@@ -40,6 +29,23 @@ endif
 let s:cpo_save = &cpo
 set cpo&vim
 
+" indent correctly if inside <script>
+" vim/vim@690afe1 for the switch from cindent
+" overridden with b:html_indent_script1
+call extend(g:,{'html_indent_script1': 'inc'},'keep')
+
+" Regex of syntax group names that are or delimit string or are comments.
+let s:bvars = {
+      \ 'syng_strcom': 'string\|comment\|regex\|special\|doc\|template\%(braces\)\@!',
+      \ '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'
+
+function s:GetVars()
+  call extend(b:,extend(s:bvars,{'js_cache': [0,0,0]}),'keep')
+endfunction
+
 " Get shiftwidth value
 if exists('*shiftwidth')
   function s:sw()
@@ -55,20 +61,19 @@ endif
 " matches before pos.
 let s:z = has('patch-7.4.984') ? 'z' : ''
 
-let s:syng_com = 'comment\|doc'
 " Expression used to check whether we should skip a match with searchpair().
 let s:skip_expr = "s:SynAt(line('.'),col('.')) =~? b:syng_strcom"
+let s:in_comm = s:skip_expr[:-14] . "'comment\\|doc'"
 
+let s:rel = has('reltime')
 " searchpair() wrapper
-if has('reltime')
-  function s:GetPair(start,end,flags,skip,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)
+if s:rel
+  function s:GetPair(start,end,flags,skip)
+    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,s:l1,a:skip ==# 's:SkipFunc()' ? 2000 : 200)
   endfunction
 else
-  function s:GetPair(start,end,flags,skip,...)
-    return searchpair('\m'.(a:start == '[' ? '\[' : a:start),'','\m'.a:end,
-          \ a:flags,a:skip,max([prevnonblank(v:lnum) - 1000,0,get(a:000,1)]))
+  function s:GetPair(start,end,flags,skip)
+    return searchpair('\m'.a:start,'','\m'.a:end,a:flags,a:skip,s:l1)
   endfunction
 endif
 
@@ -82,60 +87,55 @@ function s:SynAt(l,c)
 endfunction
 
 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:]]
+  let [divider, n, cstr] = [0] + matchlist(&cino,
+        \ '\%(.*,\)\=\%(\%d'.char2nr(a:f).'\(-\)\=\([.s0-9]*\)\)\=')[1:2]
   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()
+      if n !~ '\d'
+        return n . s:sw() + 0
       endif
+      let n = str2nr(n) * s:sw()
       break
-    elseif c =~ '\d'
-      let [n, divider] .= [c, 0]
     else
-      break
+      let [n, divider] .= [c, 0]
     endif
   endfor
-  return sign * str2nr(n) / max([str2nr(divider),1])
+  return str2nr(n) / max([str2nr(divider),1])
 endfunction
 
 " Optimized {skip} expr, only callable from the search loop which
-" GetJavascriptIndent does to find the containing [[{(] (relies on s:vars)
+" GetJavascriptIndent does to find the containing [[{(] (side-effects)
 function s:SkipFunc()
   if s:top_col == 1
     throw 'out of bounds'
-  endif
-  let s:top_col = 0
-  if s:check_in
+  elseif 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
+  elseif search('\m`\|\${\|\*\/','nW'.s:z,s:looksyn)
+    if eval(s:skip_expr)
+      let s:check_in = 1
+      return 1
+    endif
+  else
+    let s:synid_cache[:] += [[line2byte('.') + col('.') - 1], ['']]
   endif
   let [s:looksyn, s:top_col] = getpos('.')[1:2]
 endfunction
 
 function s:AlternatePair()
   let [pat, l:for] = ['[][(){};]', 2]
-  while s:SearchLoop('\m'.pat,'bW',s:script_tag,'s:SkipFunc()')
+  while s:SearchLoop(pat,'bW','s:SkipFunc()')
     if s:LookingAt() == ';'
       if !l:for
-        if s:GetPair('{','}','bW','s:SkipFunc()',2000,s:script_tag)
+        if s:GetPair('{','}','bW','s:SkipFunc()')
           return
         endif
         break
@@ -146,7 +146,7 @@ function s:AlternatePair()
       let idx = stridx('])}',s:LookingAt())
       if idx == -1
         return
-      elseif !s:GetPair('[({'[idx],'])}'[idx],'bW','s:SkipFunc()',2000,s:script_tag)
+      elseif !s:GetPair(['\[','(','{'][idx],'])}'[idx],'bW','s:SkipFunc()')
         break
       endif
     endif
@@ -166,61 +166,64 @@ function s:Token()
   return s:LookingAt() =~ '\k' ? expand('<cword>') : s:LookingAt()
 endfunction
 
-function s:PreviousToken()
-  let l:pos = getpos('.')
+function s:PreviousToken(...)
+  let [l:pos, tok] = [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()
+    if getline('.')[col('.')-2:col('.')-1] == '*/'
+      if eval(s:in_comm) && !s:SearchLoop('\S\ze\_s*\/[/*]','bW',s:in_comm)
+        call setpos('.',l:pos)
+      else
+        let tok = s:Token()
       endif
-      call setpos('.',l:pos)
     else
-      return s:Token()
+      let two = a:0 || line('.') != l:pos[1] ? strridx(getline('.')[:col('.')],'//') + 1 : 0
+      if two && eval(s:in_comm)
+        call cursor(0,two)
+        let tok = s:PreviousToken(1)
+        if tok is ''
+          call setpos('.',l:pos)
+        endif
+      else
+        let tok = s:Token()
+      endif
     endif
   endif
-  return ''
+  return tok
 endfunction
 
 function s:Pure(f,...)
-  let l:pos = getpos('.')
-  let ret = call(a:f,a:000)
-  call setpos('.',l:pos)
-  return ret
+  return eval("[call(a:f,a:000),cursor(a:firstline,".col('.').")][0]")
 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)
+function s:SearchLoop(pat,flags,expr)
+  return s:GetPair(a:pat,'\_$.',a:flags,a:expr)
 endfunction
 
 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)
+  let bal = 0
+  while s:SearchLoop('[{}?:]','bW',s:skip_expr)
     if s:LookingAt() == ':'
-      let bal -= strpart(getline('.'),col('.')-2,3) !~ '::'
+      if getline('.')[col('.')-2] == ':'
+        call cursor(0,col('.')-1)
+        continue
+      endif
+      let bal -= 1
     elseif s:LookingAt() == '?'
-      let bal += 1
-      if bal == 1
-        break
+      if getline('.')[col('.'):col('.')+1] =~ '^\.\d\@!'
+        continue
+      elseif !bal
+        return 1
       endif
+      let bal += 1
     elseif s:LookingAt() == '{'
-      let bal = !s:IsBlock()
-      break
-    elseif !s:GetPair('{','}','bW',s:skip_expr,200)
+      return !s:IsBlock()
+    elseif !s:GetPair('{','}','bW',s:skip_expr)
       break
     endif
   endwhile
-  call setpos('.',l:pos)
-  return s:Nat(bal)
 endfunction
 
 " configurable regexes that define continuation lines, not including (, {, or [.
@@ -229,167 +232,146 @@ let s:opfirst = '^' . get(g:,'javascript_opfirst',
 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)
+function s:Continues()
+  let tok = matchstr(strpart(getline('.'),col('.')-15,15),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 s:SynAt(a:ln, len(a:con)) !~? (tok == '>' ? 'jsflow\|^html' : 'regex')
-endfunction
-
-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: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
-    break
-  endwhile
-  call setpos('.',l:pos)
-  return l:n
+  return s:SynAt(line('.'),col('.')) !~? (tok == '>' ? 'jsflow\|^html' : 'regex')
 endfunction
 
 " Check if line 'lnum' has a balanced amount of parentheses.
-function s:Balanced(lnum)
-  let [l:open, l:line] = [0, getline(a:lnum)]
-  let pos = match(l:line, '[][(){}]')
+function s:Balanced(lnum,line)
+  let l:open = 0
+  let pos = match(a:line, '[][(){}]')
   while pos != -1
     if s:SynAt(a:lnum,pos + 1) !~? b:syng_strcom
-      let l:open += match(' ' . l:line[pos],'[[({]')
+      let l:open += matchend(a:line[pos],'[[({]')
       if l:open < 0
         return
       endif
     endif
-    let pos = match(l:line, l:open ?
-          \ matchstr(['[][]','[()]','[{}]'],l:line[pos]) :
-          \ '[][(){}]', pos + 1)
+    let pos = match(a:line, !l:open ? '[][(){}]' : '()' =~ a:line[pos] ?
+          \ '[()]' : '{}' =~ a: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)
+function s:OneScope()
+  if s:LookingAt() == ')' && s:GetPair('(', ')', 'bW', s:skip_expr)
     let tok = s:PreviousToken()
-    return (tok =~# '^\%(for\|if\|let\|while\|with\)$' ||
+    return (count(split('for if let while with'),tok) ||
           \ tok =~# '^await$\|^each$' && s:PreviousToken() ==# 'for') &&
           \ s:Pure('s:PreviousToken') != '.' && !(tok == 'while' && s:DoWhile())
   elseif s:Token() =~# '^else$\|^do$'
     return s:Pure('s:PreviousToken') != '.'
+  elseif strpart(getline('.'),col('.')-2,2) == '=>'
+    call cursor(0,col('.')-1)
+    return s:PreviousToken() != ')' || s:GetPair('(', ')', 'bW', s:skip_expr)
   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
+  while s:SearchLoop('\C[{}]\|\<\%(do\|while\)\>','bW',s:skip_expr)
+    if s:LookingAt() =~ '\a'
+      if s:Pure('s:IsBlock')
+        if s:LookingAt() ==# 'd'
+          return 1
+        endif
+        break
+      endif
+    elseif s:LookingAt() != '}' || !s:GetPair('{','}','bW',s:skip_expr)
+      break
     endif
-    call call('cursor',cpos)
-  endif
+  endwhile
+  call call('cursor',cpos)
 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)
+" returns total offset from braceless contexts. 'num' is the lineNr which
+" encloses the entire context, 'cont' if whether a:firstline is a continued
+" expression, which could have started in a braceless context
+function s:IsContOne(cont)
+  let [l:num, pind] = b:js_cache[1] ?
+        \ [b:js_cache[1], indent(b:js_cache[1]) + s:sw()] : [1,0]
+  let [ind, b_l] = [indent('.') + !a:cont, 0]
+  while line('.') > l:num && ind > pind || line('.') == l:num
+    if indent('.') < ind && s:OneScope()
       let b_l += 1
-      let l:i = line('.')
-    elseif !a:cont || b_l || ind < indent(a:i)
+    elseif !a:cont || b_l || ind < indent(a:firstline)
+      break
+    else
+      call cursor(0,1)
+    endif
+    let ind = min([ind, indent('.')])
+    if s:PreviousToken() is ''
       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$' || s:PreviousToken() == '.'))
+  return search('\m\C\%'.join(b:js_cache[1:],'l\%').
+        \ 'c{\_s*\%(\%(\/\/.*\_$\|\/\*\_.\{-}\*\/\)\@>\_s*\)*\%(case\|default\)\>','nW'.s:z)
 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'
+  if join(s:stack) =~? 'xml\|jsx' && s:SynAt(line('.'),col('.')-1) =~? 'xml\|jsx'
+    let s:in_jsx = 1
     return tok != '{'
   elseif tok =~ '\k'
     if tok ==# 'type'
       return s:Pure('eval',"s:PreviousToken() !~# '^\\%(im\\|ex\\)port$' || s:PreviousToken() == '.'")
+    elseif tok ==# 'of'
+      return s:Pure('eval',"!s:GetPair('[[({]','[])}]','bW',s:skip_expr) || s:LookingAt() != '(' ||"
+            \ ."s:{s:PreviousToken() ==# 'await' ? 'Previous' : ''}Token() !=# 'for' || s:PreviousToken() == '.'")
     endif
-    return index(split('return const let import export extends yield default delete var await void typeof throw case new of in instanceof')
-          \ ,tok) < (line('.') != l:n) || s:Pure('s:PreviousToken') == '.'
+    return index(split('return const let import export extends yield default delete var await void typeof throw case new in instanceof')
+          \ ,tok) < (line('.') != a:firstline) || s:Pure('s:PreviousToken') == '.'
   elseif tok == '>'
     return getline('.')[col('.')-2] == '=' || s:SynAt(line('.'),col('.')) =~? 'jsflow\|^html'
   elseif tok == '*'
     return s:Pure('s:PreviousToken') == ':'
   elseif tok == ':'
-    return !s:ExprCol()
+    return s:Pure('eval',"s:PreviousToken() =~ '^\\K\\k*$' && !s:ExprCol()")
   elseif tok == '/'
     return s:SynAt(line('.'),col('.')) =~? 'regex'
   elseif tok !~ '[=~!<,.?^%|&([]'
-    return tok !~ '[-+]' || l:n != line('.') && getline('.')[col('.')-2] == tok
+    return tok !~ '[-+]' || line('.') != a:firstline && getline('.')[col('.')-2] == tok
   endif
 endfunction
 
 function GetJavascriptIndent()
-  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')"),
-        \ ]
+  call s:GetVars()
+  let s:synid_cache = [[],[]]
+  let l:line = getline(v:lnum)
   " use synstack as it validates syn state and works in an empty line
-  let syns = get(s:stack,-1,'')
+  let s:stack = [''] + map(synstack(v:lnum,1),"synIDattr(v:val,'name')")
 
   " start with strings,comments,etc.
-  if syns =~? s:syng_com
-    if l:line =~ '^\s*\*'
-      return cindent(v:lnum)
-    elseif l:line !~ '^\s*\/[/*]'
-      return -1
+  if s:stack[-1] =~? 'comment\|doc'
+    if l:line !~ '^\s*\/[/*]'
+      return l:line =~ '^\s*\*' ? cindent(v:lnum) : -1
     endif
-  elseif syns =~? b:syng_str
-    if b:js_cache[0] == v:lnum - 1 && s:Balanced(v:lnum-1)
+  elseif s:stack[-1] =~? b:syng_str
+    if b:js_cache[0] == v:lnum - 1 && s:Balanced(v:lnum-1,getline(v:lnum-1))
       let b:js_cache[0] = v:lnum
     endif
     return -1
   endif
-  let l:lnum = s:PrevCodeLine(v:lnum - 1)
-  if !l:lnum
+
+  let s:l1 = max([0,prevnonblank(v:lnum) - (s:rel ? 2000 : 1000),
+        \ get(get(b:,'hi_indent',{}),'blocklnr')])
+  call cursor(v:lnum,1)
+  if s:PreviousToken() is ''
     return
   endif
+  let [l:lnum, lcol, pline] = getpos('.')[1:2] + [getline('.')[:col('.')-1]]
 
   let l:line = substitute(l:line,'^\s*','','')
   let l:line_raw = l:line
@@ -401,34 +383,34 @@ function GetJavascriptIndent()
   endif
 
   " 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]) ]
+  call cursor(v:lnum,1)
+  let idx = 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])
+        \ b:js_cache[0] == l:lnum && s:Balanced(l:lnum,pline)
+    call call('cursor',b:js_cache[1:])
   else
-    call cursor(v:lnum,1)
-    let [s:looksyn, s:check_in, s:top_col] = [v:lnum - 1, 0, 0]
+    let [s:looksyn, s:top_col, s:check_in, s:l1] = [v:lnum - 1,0,0,
+          \ max([s:l1, &smc ? search('\m^.\{'.&smc.',}','nbW',s:l1 + 1) + 1 : 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)
+        call s:GetPair(['\[','(','{'][idx],'])}'[idx],'bW','s:SkipFunc()')
+      elseif getline(v:lnum) !~ '^\S' && s:stack[-1] =~? 'block\|^jsobject$'
+        call s:GetPair('{','}','bW','s:SkipFunc()')
       else
         call s:AlternatePair()
       endif
-    catch
+    catch /^\Cout of bounds$/
       call cursor(v:lnum,1)
     endtry
+    let b:js_cache[1:] = line('.') == v:lnum ? [0,0] : getpos('.')[1:2]
   endif
 
-  let b:js_cache = [v:lnum] + (line('.') == v:lnum ? [s:script_tag,0] : getpos('.')[1:2])
-  let num = b:js_cache[1]
+  let [b:js_cache[0], num] = [v:lnum, b:js_cache[1]]
 
-  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)
+  let [num_ind, is_op, b_l, l:switch_offset, s:in_jsx] = [s:Nat(indent(num)),0,0,0,0]
+  if !num || s:LookingAt() == '{' && s:IsBlock()
+    let ilnum = line('.')
+    if num && !s:in_jsx && s:LookingAt() == ')' && s:GetPair('(',')','bW',s:skip_expr)
       if ilnum == num
         let [num, num_ind] = [line('.'), indent('.')]
       endif
@@ -442,20 +424,26 @@ function GetJavascriptIndent()
       endif
     endif
     if idx == -1 && pline[-1:] !~ '[{;]'
+      call cursor(l:lnum, lcol)
       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()
+      if sol is '' || sol == '/' && s:SynAt(v:lnum,
+            \ 1 + len(getline(v:lnum)) - len(l:line)) =~? 'regex'
+        if s:Continues()
+          let is_op = s:sw()
         endif
-        let is_op = s:sw()
-      elseif sol isnot '' || s:Continues(l:lnum,pline)
+      elseif num && sol =~# '^\%(in\%(stanceof\)\=\|\*\)$' &&
+            \ s:LookingAt() == '}' && s:GetPair('{','}','bW',s:skip_expr) &&
+            \ s:PreviousToken() == ')' && s:GetPair('(',')','bW',s:skip_expr) &&
+            \ (s:PreviousToken() == ']' || s:LookingAt() =~ '\k' &&
+            \ s:{s:PreviousToken() == '*' ? 'Previous' : ''}Token() !=# 'function')
+        return num_ind + s:sw()
+      else
         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()
+      call cursor(l:lnum, lcol)
+      let b_l = s:Nat(s:IsContOne(is_op) - (!is_op && l:line =~ '^{')) * s:sw()
     endif
-  elseif idx == -1 && getline(b:js_cache[1])[b:js_cache[2]-1] == '(' && &cino =~ '(' &&
+  elseif idx == -1 && s:LookingAt() == '(' && &cino =~ '(' &&
         \ (search('\m\S','nbW',num) || s:ParseCino('U'))
     let pval = s:ParseCino('(')
     if !pval
@@ -465,15 +453,15 @@ function GetJavascriptIndent()
       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())
+    return s:Nat(num_ind + pval + searchpair('\m(','','\m)','nbrmW',s:skip_expr,num) * s:sw())
   endif
 
   " main return
   if l:line =~ '^[])}]\|^|}'
-    if l:line_raw[0] == ')' && getline(b:js_cache[1])[b:js_cache[2]-1] == '('
+    if l:line_raw[0] == ')'
       if s:ParseCino('M')
         return indent(l:lnum)
-      elseif &cino =~# 'm' && !s:ParseCino('m')
+      elseif num && &cino =~# 'm' && !s:ParseCino('m')
         return virtcol('.') - 1
       endif
     endif
@@ -481,6 +469,10 @@ function GetJavascriptIndent()
   elseif num
     return s:Nat(num_ind + get(l:,'case_offset',s:sw()) + l:switch_offset + b_l + is_op)
   endif
+  let nest = get(get(b:,'hi_indent',{}),'blocklnr')
+  if nest
+    return indent(nest) + s:sw() + b_l + is_op
+  endif
   return b_l + is_op
 endfunction
 
diff --git a/syntax/javascript.vim b/syntax/javascript.vim
index a238c8e..7aa799d 100644
--- a/syntax/javascript.vim
+++ b/syntax/javascript.vim
@@ -24,17 +24,17 @@ syntax sync fromstart
 " syntax case ignore
 syntax case match
 
-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   jsNoise          /[:,;]/
+syntax match   jsNoise          /\./ skipwhite skipempty nextgroup=jsObjectProp,jsFuncCall,jsPrototype,jsTaggedTemplate
+syntax match   jsObjectProp     contained /\<\K\k*/
+syntax match   jsFuncCall       /\<\K\k*\ze\s*(/
 syntax match   jsParensError    /[)}\]]/
 
 " Program Keywords
 syntax keyword jsStorageClass   const var let skipwhite skipempty nextgroup=jsDestructuringBlock,jsDestructuringArray,jsVariableDef
-syntax match   jsVariableDef    contained /\k\+/ skipwhite skipempty nextgroup=jsFlowDefinition
+syntax match   jsVariableDef    contained /\<\K\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 match   jsOperator       /::/ skipwhite skipempty nextgroup=@jsExpression
 syntax keyword jsBooleanTrue    true
 syntax keyword jsBooleanFalse   false
@@ -42,7 +42,7 @@ syntax keyword jsBooleanFalse   false
 " Modules
 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 match   jsModuleKeyword      contained /\<\K\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
@@ -51,44 +51,37 @@ syntax keyword jsFrom               contained from skipwhite skipempty nextgroup
 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=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 region  jsString           start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  contains=jsSpecial,@Spell extend
+syntax region  jsTemplateString   start=+`+  skip=+\\`+  end=+`+     contains=jsTemplateExpression,jsSpecial,@Spell extend
+syntax match   jsTaggedTemplate   /\<\K\k*\ze`/ nextgroup=jsTemplateString
+syntax match   jsNumber           /\c\<\%(\d\+\%(e[+-]\=\d\+\)\=\|0b[01]\+\|0o\o\+\|0x\x\+\)\>/
 syntax keyword jsNumber           Infinity
-syntax match   jsFloat            /\<\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%([eE][+-]\=\d\+\)\=\>/
+syntax match   jsFloat            /\c\<\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%(e[+-]\=\d\+\)\=\>/
 
 " Regular Expressions
-syntax match   jsSpecial            contained "\v\\%(0|\\x\x\{2\}\|\\u\x\{4\}\|\c[A-Z]|.)"
+syntax match   jsSpecial            contained "\v\\%(x\x\x|u%(\x{4}|\{\x{4,5}})|c\u|.)"
 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=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
-else
-  syntax region  jsRegexpString   start=+\%(\%(\%(return\|case\)\s\+\)\@<=\|\%(\%([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\.\|\[\%(\\.\|[^]]\)*\]+ end=+/[gimyu]\{,5}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
-endif
+syntax region  jsRegexpCharClass    contained start=+\[+ skip=+\\.+ end=+\]+ contains=jsSpecial
+syntax match   jsRegexpBoundary     contained "\v\c[$^]|\\b"
+syntax match   jsRegexpBackRef      contained "\v\\[1-9]\d*"
+syntax match   jsRegexpQuantifier   contained "\v[^\\]%([?*+]|\{\d+%(,\d*)?})\??"lc=1
+syntax match   jsRegexpOr           contained "|"
+syntax match   jsRegexpMod          contained "\v\(\?[:=!>]"lc=1
+syntax region  jsRegexpGroup        contained start="[^\\]("lc=1 skip="\\.\|\[\(\\.\|[^]]\+\)\]" end=")" contains=jsRegexpCharClass,@jsRegexpSpecial keepend
+syntax region  jsRegexpString   start=+\%(\%(\<return\|\<typeof\|\_[^)\]'"[:blank:][:alnum:]_$]\)\s*\)\@<=/\ze[^*/]+ skip=+\\.\|\[[^]]\{1,}\]+ end=+/[gimyus]\{,6}+ contains=jsRegexpCharClass,jsRegexpGroup,@jsRegexpSpecial oneline keepend extend
 syntax cluster jsRegexpSpecial    contains=jsSpecial,jsRegexpBoundary,jsRegexpBackRef,jsRegexpQuantifier,jsRegexpOr,jsRegexpMod
 
 " Objects
-syntax match   jsObjectKey         contained /\<[0-9a-zA-Z_$]*\>\(\s*:\)\@=/ contains=jsFunctionKey skipwhite skipempty nextgroup=jsObjectValue
+syntax match   jsObjectKey         contained /\<\k*\ze\s*:/ contains=jsFunctionKey skipwhite skipempty nextgroup=jsObjectValue
 syntax match   jsObjectColon       contained /:/ skipwhite skipempty
-syntax region  jsObjectKeyString   contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell skipwhite skipempty nextgroup=jsObjectValue
-syntax region  jsObjectKeyString   contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell skipwhite skipempty nextgroup=jsObjectValue
+syntax region  jsObjectKeyString   contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  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 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\)\%( \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
+syntax region  jsObjectValue       contained matchgroup=jsNoise start=/:/ end=/[,}]\@=/ contains=@jsExpression extend
+syntax match   jsObjectFuncName    contained /\<\K\k*\ze\_s*(/ skipwhite skipempty nextgroup=jsFuncArgs
+syntax match   jsFunctionKey       contained /\<\K\k*\ze\s*:\s*function\>/
+syntax match   jsObjectMethodType  contained /\<[gs]et\ze\s\+\K\k*/ skipwhite skipempty nextgroup=jsObjectFuncName
+syntax region  jsObjectStringKey   contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  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     : '').' skipwhite skipempty nextgroup=@jsExpression'
@@ -99,25 +92,25 @@ 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 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 match   jsBlockLabel              /\<\K\k*\s*::\@!/    contains=jsNoise skipwhite skipempty nextgroup=jsBlock
+syntax match   jsBlockLabelKey contained /\<\K\k*\ze\s*\_[;]/
+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 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 jsGlobalObjects      Array Boolean Date Function Iterator Number Object Symbol Map WeakMap Set WeakSet 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 __dirname __filename
 syntax match   jsGlobalNodeObjects  /\<require\>/ containedin=jsFuncCall
 syntax keyword jsExceptions         Error EvalError InternalError RangeError ReferenceError StopIteration SyntaxError TypeError URIError
@@ -162,68 +155,68 @@ syntax region  jsBlock                        matchgroup=jsBraces              s
 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 extend skipwhite skipempty nextgroup=@jsExpression
+syntax region  jsTernaryIf                    matchgroup=jsTernaryIfOperator   start=/?/  end=/\%(:\|}\@=\)/  contains=@jsExpression extend skipwhite skipempty nextgroup=@jsExpression
+syntax match   jsOperator       /?\.\ze\_D/
 
-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
+syntax match   jsGenerator            contained /\*/ skipwhite skipempty nextgroup=jsFuncName,jsFuncArgs,jsFlowFunctionGroup
+syntax match   jsFuncName             contained /\<\K\k*/ skipwhite skipempty nextgroup=jsFuncArgs,jsFlowFunctionGroup
 syntax region  jsFuncArgExpression    contained matchgroup=jsFuncArgOperator start=/=/ end=/[,)]\@=/ contains=@jsExpression extend
 syntax match   jsFuncArgCommas        contained ','
 syntax keyword jsArguments            contained arguments
 syntax keyword jsForAwait             contained await skipwhite skipempty nextgroup=jsParenRepeat
 
 " Matches a single keyword argument with no parens
-syntax match   jsArrowFuncArgs  /\k\+\s*\%(=>\)\@=/ skipwhite contains=jsFuncArgs skipwhite skipempty nextgroup=jsArrowFunction extend
+syntax match   jsArrowFuncArgs  /\<\K\k*\ze\s*=>/ skipwhite contains=jsFuncArgs skipwhite skipempty nextgroup=jsArrowFunction extend
 " Matches a series of arguments surrounded in parens
-syntax match   jsArrowFuncArgs  /([^()]*)\s*\(=>\)\@=/ contains=jsFuncArgs skipempty skipwhite nextgroup=jsArrowFunction extend
+syntax match   jsArrowFuncArgs  /([^()]*)\ze\s*=>/ contains=jsFuncArgs skipempty skipwhite nextgroup=jsArrowFunction extend
 
-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 : '')
+exe 'syntax match jsFunction /\<function\>/ skipwhite skipempty nextgroup=jsGenerator,jsFuncName,jsFuncArgs,jsFlowFunctionGroup 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 /()\ze\s*=>/   skipwhite skipempty nextgroup=jsArrowFunction                                        '.(exists('g:javascript_conceal_noarg_arrow_function') ? 'conceal cchar='.g:javascript_conceal_noarg_arrow_function : '')
+exe 'syntax match jsArrowFunction /_\ze\s*=>/    skipwhite skipempty nextgroup=jsArrowFunction                                        '.(exists('g:javascript_conceal_underscore_arrow_function') ? 'conceal cchar='.g:javascript_conceal_underscore_arrow_function : '')
 
 " Classes
 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\)\%( \k\+\)\@=/ skipwhite skipempty nextgroup=jsAsyncKeyword,jsFuncName,jsClassProperty
+syntax match   jsClassMethodType        contained /\<\%([gs]et\|static\)\ze\s\+\K\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 match   jsClassProperty          contained /\<\K\k*\ze\s*=/ skipwhite skipempty nextgroup=jsClassValue,jsFlowClassDef
+syntax region  jsClassValue             contained start=/=/ end=/\_[;}]\@=/ 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
-syntax region  jsClassStringKey         contained start=+"+  skip=+\\\("\|$\)+  end=+"\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs
-syntax region  jsClassStringKey         contained start=+'+  skip=+\\\('\|$\)+  end=+'\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs
+syntax match   jsClassFuncName          contained /\<\K\k*\ze\s*(/ skipwhite skipempty nextgroup=jsFuncArgs
+syntax region  jsClassStringKey         contained start=+\z(["']\)+  skip=+\\\%(\z1\|$\)+  end=+\z1\|$+  contains=jsSpecial,@Spell extend skipwhite skipempty nextgroup=jsFuncArgs
 
 " Destructuring
-syntax match   jsDestructuringPropertyValue     contained /\<[0-9a-zA-Z_$]*\>/
-syntax match   jsDestructuringProperty          contained /\<[0-9a-zA-Z_$]*\>\(\s*=\)\@=/ skipwhite skipempty nextgroup=jsDestructuringValue
-syntax match   jsDestructuringAssignment        contained /\<[0-9a-zA-Z_$]*\>\(\s*:\)\@=/ skipwhite skipempty nextgroup=jsDestructuringValueAssignment
+syntax match   jsDestructuringPropertyValue     contained /\k\+/
+syntax match   jsDestructuringProperty          contained /\k\+\ze\s*=/ skipwhite skipempty nextgroup=jsDestructuringValue
+syntax match   jsDestructuringAssignment        contained /\k\+\ze\s*:/ skipwhite skipempty nextgroup=jsDestructuringValueAssignment
 syntax region  jsDestructuringValue             contained start=/=/ end=/[,}\]]\@=/ contains=@jsExpression extend
 syntax region  jsDestructuringValueAssignment   contained start=/:/ end=/[,}=]\@=/ contains=jsDestructuringPropertyValue,jsDestructuringBlock,jsNoise,jsDestructuringNoise skipwhite skipempty nextgroup=jsDestructuringValue extend
-syntax match   jsDestructuringNoise             contained /[,\[\]]/
+syntax match   jsDestructuringNoise             contained /[,[\]]/
 syntax region  jsDestructuringPropertyComputed  contained matchgroup=jsBrackets start=/\[/ end=/]/ contains=@jsExpression skipwhite skipempty nextgroup=jsDestructuringValue,jsDestructuringNoise extend fold
 
 " Comments
 syntax keyword jsCommentTodo    contained TODO FIXME XXX TBD
-syntax region  jsComment        start=/\/\// end=/$/ contains=jsCommentTodo,@Spell extend keepend
-syntax region  jsComment        start=/\/\*/  end=/\*\// contains=jsCommentTodo,@Spell fold extend keepend
+syntax region  jsComment        start=+//+ end=/$/ contains=jsCommentTodo,@Spell extend keepend
+syntax region  jsComment        start=+/\*+  end=+\*/+ contains=jsCommentTodo,@Spell fold extend keepend
 syntax region  jsEnvComment     start=/\%^#!/ end=/$/ display
 
 " Specialized Comments - These are special comment regexes that are used in
 " odd places that maintain the proper nextgroup functionality. It sucks we
 " can't make jsComment a skippable type of group for nextgroup
-syntax region  jsCommentFunction    contained start=/\/\// end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn extend keepend
-syntax region  jsCommentFunction    contained start=/\/\*/ end=/\*\// contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn fold extend keepend
-syntax region  jsCommentClass       contained start=/\/\// end=/$/    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  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
+syntax region  jsCommentFunction    contained start=+//+ end=/$/    contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn extend keepend
+syntax region  jsCommentFunction    contained start=+/\*+ end=+\*/+ contains=jsCommentTodo,@Spell skipwhite skipempty nextgroup=jsFuncBlock,jsFlowReturn fold extend keepend
+syntax region  jsCommentClass       contained start=+//+ end=/$/    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  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
-syntax match   jsDecoratorFunction  contained /[a-zA-Z_][a-zA-Z0-9_.]*/ nextgroup=jsParenDecorator
+syntax match   jsDecoratorFunction  contained /\h[a-zA-Z0-9_.]*/ nextgroup=jsParenDecorator
 
 if exists("javascript_plugin_jsdoc")
   runtime extras/jsdoc.vim
@@ -237,8 +230,8 @@ if exists("javascript_plugin_flow")
   runtime extras/flow.vim
 endif
 
-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
+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,jsStatement
+syntax cluster jsAll         contains=@jsExpression,jsStorageClass,jsConditional,jsRepeat,jsReturn,jsException,jsTry,jsNoise,jsBlockLabel
 
 " Define the default highlighting.
 " For version 5.7 and earlier: only when not done already