Added files for demoing DWIM and linting.

.eslintrc.json

+{
+  "env": {
+    "es2020": true,
+    "browser": true,
+    "node": true,
+    "jest": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 2022,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "rules": {
+    "accessor-pairs": "warn",
+    "array-bracket-spacing": "warn",
+    "array-callback-return": "warn",
+    "arrow-body-style": "warn",
+    "arrow-parens": "warn",
+    "arrow-spacing": "warn",
+    "block-scoped-var": "warn",
+    "block-spacing": "warn",
+    "brace-style": "warn",
+    "camelcase": "warn",
+    "comma-dangle": ["warn", "always-multiline"],
+    "comma-spacing": "warn",
+    "comma-style": "warn",
+    "computed-property-spacing": "warn",
+    "consistent-return": "warn",
+    "consistent-this": "warn",
+    "constructor-super": "warn",
+    "curly": "warn",
+    "default-case": [
+      "warn"
+    ],
+    "dot-location": ["warn", "property"],
+    "dot-notation": "warn",
+    "eol-last": "warn",
+    "eqeqeq": "warn",
+    "func-call-spacing": "warn",
+    "func-name-matching": "warn",
+    "func-names": ["warn", "as-needed"],
+    "generator-star-spacing": ["warn", "neither"],
+    "getter-return": "warn",
+    "guard-for-in": "off", // see no-restricted-syntax
+    "id-blacklist": ["warn", "temp"],
+    "indent": ["warn", 2],
+    "init-declarations": "warn",
+    "jsx-quotes": "warn",
+    "key-spacing": "warn",
+    "keyword-spacing": "warn",
+    "linebreak-style": "warn",
+    "lines-around-directive": "warn",
+    "max-len": [
+      "warn",
+      {
+        "code": 120
+      }
+    ],
+    "max-statements-per-line": "warn",
+    "new-cap": "warn",
+    "new-parens": "warn",
+    "no-alert": "warn",
+    "no-array-constructor": "warn",
+    "no-caller": "warn",
+    "no-case-declarations": "warn",
+    "no-catch-shadow": "warn",
+    "no-class-assign": "warn",
+    "no-compare-neg-zero": "warn",
+    "no-cond-assign": "warn",
+    "no-const-assign": "warn",
+    "no-constant-condition": "warn",
+    "no-control-regex": "warn",
+    "no-debugger": "warn",
+    "no-delete-var": "warn",
+    "no-div-regex": "warn",
+    "no-dupe-args": "warn",
+    "no-dupe-class-members": "warn",
+    "no-dupe-keys": "warn",
+    "no-duplicate-case": "warn",
+    "no-duplicate-imports": "warn",
+    "no-else-return": "warn",
+    "no-empty": "warn",
+    "no-empty-character-class": "warn",
+    "no-empty-pattern": "warn",
+    "no-eq-null": "warn",
+    "no-eval": "warn",
+    "no-ex-assign": "warn",
+    "no-extend-native": "warn",
+    "no-extra-bind": "warn",
+    "no-extra-boolean-cast": "warn",
+    "no-extra-label": "warn",
+    "no-extra-parens": [
+      "warn",
+      "all",
+      {
+        "nestedBinaryExpressions": false
+      }
+    ],
+    "no-extra-semi": "warn",
+    "no-fallthrough": [
+      "warn"
+    ],
+    "no-floating-decimal": "warn",
+    "no-func-assign": "warn",
+    "no-global-assign": "warn",
+    "no-implicit-coercion": "warn",
+    "no-implied-eval": "warn",
+    "no-inner-declarations": "warn",
+    "no-invalid-regexp": "warn",
+    "no-irregular-whitespace": "warn",
+    "no-iterator": "warn",
+    "no-label-var": "warn",
+    "no-labels": [
+      "warn",
+      {
+        "allowLoop": true,
+        "allowSwitch": false
+      }
+    ],
+    "no-lone-blocks": "warn",
+    "no-lonely-if": "warn",
+    "no-loop-func": "warn",
+    "no-magic-numbers": ["warn", {
+      "ignore": [-1, -0.5, 0, 0.001, 0.5, 1, 2, 10, 100, 180, 360, 1000, "-1n", "0n", "1n", "2n", "4n"],
+      "detectObjects": true
+    }],
+    "no-mixed-operators": [
+      "warn",
+      {
+        "groups": [
+          ["&", "|", "^", "~", "<<", ">>", ">>>"],
+          ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
+          ["&&", "||"],
+          ["in", "instanceof"]
+        ],
+        "allowSamePrecedence": false
+      }
+    ],
+    "no-mixed-spaces-and-tabs": "warn",
+    "no-multi-assign": "warn",
+    "no-multi-spaces": "warn",
+    "no-multi-str": "warn",
+    "no-multiple-empty-lines": [
+      "warn",
+      {
+        "maxBOF": 0,
+        "max": 1,
+        "maxEOF": 0
+      }
+    ],
+    "no-native-reassign": "warn",
+    "no-negated-in-lhs": "warn",
+    "no-new": "warn",
+    "no-new-func": "warn",
+    "no-new-object": "warn",
+    "no-new-symbol": "warn",
+    "no-new-wrappers": "warn",
+    "no-obj-calls": "warn",
+    "no-octal": "warn",
+    "no-octal-escape": "warn",
+    "no-param-reassign": "warn",
+    "no-proto": "warn",
+    "no-prototype-builtins": "warn",
+    "no-redeclare": [
+      "warn",
+      {
+        "builtinGlobals": true
+      }
+    ],
+    "no-regex-spaces": "warn",
+    "no-restricted-globals": "warn",
+    "no-restricted-properties": "warn",
+    "no-restricted-syntax": [
+      "warn",
+      {
+        "selector": "ForInStatement",
+        "message": "for-in loop used (did you mean to write a for-of loop?)"
+      },
+      {
+        "selector": "BinaryExpression[operator=\"in\"]",
+        "message": "in operator used (did you mean to call a membership-testing method?)"
+      }
+    ],
+    "no-return-assign": "warn",
+    "no-return-await": "off",
+    "no-script-url": "warn",
+    "no-self-assign": "warn",
+    "no-self-compare": "warn",
+    "no-sequences": "warn",
+    "no-shadow": "warn",
+    "no-shadow-restricted-names": "warn",
+    "no-sparse-arrays": "warn",
+    "no-tabs": "warn",
+    "no-template-curly-in-string": "warn",
+    "no-this-before-super": "warn",
+    "no-throw-literal": "warn",
+    "no-trailing-spaces": "warn",
+    "no-undef": "warn",
+    "no-underscore-dangle": [
+      "warn",
+      {
+        "allowAfterThis": true,
+        "allowAfterSuper": true
+      }
+    ],
+    "no-unexpected-multiline": "warn",
+    "no-unmodified-loop-condition": "warn",
+    "no-unneeded-ternary": "warn",
+    "no-unreachable": "warn",
+    "no-unsafe-finally": "warn",
+    "no-unsafe-negation": "warn",
+    "no-unused-expressions": [
+      "warn",
+      {
+        "allowShortCircuit": false,
+        "allowTernary": false,
+        "allowTaggedTemplates": false
+      }
+    ],
+    "no-unused-labels": "warn",
+    "no-unused-vars": [
+      "warn",
+      {
+        "args": "none",
+        "ignoreRestSiblings": false,
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "no-use-before-define": [
+      "warn",
+      {
+        "functions": false,
+        "classes": true,
+        "variables": true
+      }
+    ],
+    "no-useless-call": "warn",
+    "no-useless-computed-key": "warn",
+    "no-useless-concat": "warn",
+    "no-useless-constructor": "warn",
+    "no-useless-escape": "warn",
+    "no-useless-rename": "warn",
+    "no-useless-return": "warn",
+    "no-var": "warn",
+    "no-void": "warn",
+    "no-warning-comments": "warn",
+    "no-whitespace-before-property": "warn",
+    "no-with": "warn",
+    "nonblock-statement-body-position": "off", // see curly
+    "object-curly-newline": "warn",
+    "object-curly-spacing": ["warn", "always"],
+    "object-property-newline": "warn",
+    "object-shorthand": "warn",
+    "one-var": ["warn", "never"],
+    "one-var-declaration-per-line": "warn",
+    "operator-assignment": "warn",
+    "operator-linebreak": ["warn", "after"],
+    "padded-blocks": ["warn", "never"],
+    "prefer-arrow-callback": "warn",
+    "prefer-const": "warn",
+    "prefer-numeric-literals": "warn",
+    "prefer-promise-reject-errors": "warn",
+    "prefer-rest-params": "warn",
+    "prefer-spread": "warn",
+    "prefer-template": "warn",
+    "quote-props": ["warn", "as-needed"],
+    "quotes": ["warn", "single"],
+    "radix": "warn",
+    "require-await": "warn",
+    "require-yield": "warn",
+    "rest-spread-spacing": "warn",
+    "semi": "warn",
+    "semi-spacing": "warn",
+    "space-before-function-paren": ["warn", "never"],
+    "space-in-parens": "warn",
+    "space-infix-ops": "warn",
+    "space-unary-ops": "warn",
+    "spaced-comment": "warn",
+    "strict": ["warn", "never"],
+    "symbol-description": "warn",
+    "template-curly-spacing": "warn",
+    "unicode-bom": "warn",
+    "use-isnan": "warn",
+    "valid-jsdoc": "warn",
+    "valid-typeof": "warn",
+    "wrap-iife": "warn",
+    "yield-star-spacing": "warn",
+    "yoda": "warn"
+  },
+  "overrides": [
+    {
+      "files": "*.test.js",
+      "rules": {
+        "dot-notation": "off",
+        "import/first": "off",
+        "no-underscore-dangle": "off",
+        "quote-props": "off",
+        "require-await": "off",
+        "no-magic-numbers": "off"
+      }
+    }
+  ],
+  "reportUnusedDisableDirectives": true
+}

.gitignore

+# dependencies
+/node_modules
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
 # misc
 *~
 .DS_Store

dwim-example.js

+// Example of problematic DWIM:
+function dwim() {
+  return
+    computeSomeNumber() +
+    computeAnotherNumber() +
+    computeYetAnotherNumber() +
+    computeTheLastNumber();
+}

package.json

+{
+  "dependencies": {
+    "eslint": "^8.47.0"
+  }
+}