diff --git a/dot_editorconfig b/dot_editorconfig
new file mode 100644
index 0000000..209cfd6
--- /dev/null
+++ b/dot_editorconfig
@@ -0,0 +1,20 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_size = 4
+indent_style = tab
+trim_trailing_whitespace = true
+
+[Makefile]
+indent_style = tab
+
+[*.{mjs,js,jsx,py,sh,bash,zsh}]
+indent_size = 4
+indent_style = space
+
+[*.{json,yml,yaml}]
+indent_style = space
+indent_size = 2
diff --git a/dot_eslintrc.js b/dot_eslintrc.js
new file mode 100644
index 0000000..db7e8c0
--- /dev/null
+++ b/dot_eslintrc.js
@@ -0,0 +1,78 @@
+module.exports = {
+    env: {
+        browser: true,
+        es2021: true,
+        node: true,
+    },
+    globals: {},
+    parser: null,
+    parserOptions: {
+        ecmaVersion: "latest",
+    },
+    plugins: [],
+    ignorePatterns: [],
+    settings: {},
+    rules: {
+        "constructor-super": ["error"],
+        "for-direction": ["error"],
+        "getter-return": ["error"],
+        "no-async-promise-executor": ["error"],
+        "no-case-declarations": ["error"],
+        "no-class-assign": ["error"],
+        "no-compare-neg-zero": ["error"],
+        "no-cond-assign": ["error"],
+        "no-const-assign": ["error"],
+        "no-constant-condition": ["error"],
+        "no-control-regex": ["error"],
+        "no-debugger": ["error"],
+        "no-delete-var": ["error"],
+        "no-dupe-args": ["error"],
+        "no-dupe-class-members": ["error"],
+        "no-dupe-else-if": ["error"],
+        "no-dupe-keys": ["error"],
+        "no-duplicate-case": ["error"],
+        "no-empty": ["error"],
+        "no-empty-character-class": ["error"],
+        "no-empty-pattern": ["error"],
+        "no-ex-assign": ["error"],
+        "no-extra-boolean-cast": ["error"],
+        "no-extra-semi": ["error"],
+        "no-fallthrough": ["error"],
+        "no-func-assign": ["error"],
+        "no-global-assign": ["error"],
+        "no-import-assign": ["error"],
+        "no-inner-declarations": ["error"],
+        "no-invalid-regexp": ["error"],
+        "no-irregular-whitespace": ["error"],
+        "no-loss-of-precision": ["error"],
+        "no-misleading-character-class": ["error"],
+        "no-mixed-spaces-and-tabs": ["error"],
+        "no-new-symbol": ["error"],
+        "no-nonoctal-decimal-escape": ["error"],
+        "no-obj-calls": ["error"],
+        "no-octal": ["error"],
+        "no-prototype-builtins": ["error"],
+        "no-redeclare": ["error"],
+        "no-regex-spaces": ["error"],
+        "no-self-assign": ["error"],
+        "no-setter-return": ["error"],
+        "no-shadow-restricted-names": ["error"],
+        "no-sparse-arrays": ["error"],
+        "no-this-before-super": ["error"],
+        "no-undef": ["error"],
+        "no-unexpected-multiline": ["error"],
+        "no-unreachable": ["error"],
+        "no-unsafe-finally": ["error"],
+        "no-unsafe-negation": ["error"],
+        "no-unsafe-optional-chaining": ["error"],
+        "no-unused-labels": ["error"],
+        "no-unused-vars": ["error"],
+        "no-useless-backreference": ["error"],
+        "no-useless-catch": ["error"],
+        "no-useless-escape": ["error"],
+        "no-with": ["error"],
+        "require-yield": ["error"],
+        "use-isnan": ["error"],
+        "valid-typeof": ["error"],
+    },
+};
diff --git a/dot_prettierrc.toml b/dot_prettierrc.toml
new file mode 100644
index 0000000..cfdfe78
--- /dev/null
+++ b/dot_prettierrc.toml
@@ -0,0 +1,7 @@
+# .prettierrc.toml
+printWidth = 80
+trailingComma = "all"
+useTabs = false
+tabWidth = 4
+semi = true
+singleQuote = false