- Enhancement: Add ESM distribution, with module property in package.json

- Refactoring: Add Rollup/Babel/Terser
- Build: Have generator file produce consumable source files directly rather than logging to console
- Linting: Switch from JSHint to ESLint (using rules, e.g., `indent` and `prefer-const`, in place on other estools project)
- Testing: Convert coffeescript test files to ES6
- Testing: Add nyc
- Testing: Check unmatched high surrogates and full coverage for AST
    expressions (further true `isExpression` and `isStatement`'s and
    false `isProblematicIfStatement`), bringing to 100% coverage
- Travis: Drop previous versions for 10, 12, 14
- Docs: Use heading nesting consistently; rmv trailing spaces

Author: brettz9

.babelrc.json

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    ["@babel/preset-env"]
+  ]
+}

.eslintignore

@@ -0,0 +1,8 @@
+node_modules
+dist
+
+!.eslintrc.js
+coverage
+
+src/es5-identifier.js
+src/es6-identifier.js

.eslintrc.js

@@ -0,0 +1,48 @@
+'use strict';
+module.exports = {
+    env: {
+        browser: true,
+        commonjs: true,
+        es6: true,
+        node: true
+    },
+    extends: 'eslint:recommended',
+    globals: {
+        Atomics: 'readonly',
+        SharedArrayBuffer: 'readonly'
+    },
+    overrides: [{
+        files: '.eslintrc.js',
+        parserOptions: {
+            sourceType: 'script'
+        },
+        rules: {
+            strict: 'error'
+        }
+    }, {
+        files: 'test/**',
+        globals: {
+            expect: true
+        },
+        env: {
+            mocha: true
+        }
+    }],
+    parserOptions: {
+        sourceType: 'module',
+        ecmaVersion: 2018
+    },
+    rules: {
+        semi: ['error'],
+        indent: ['error', 4, { SwitchCase: 1 }],
+        'prefer-const': ['error'],
+        'no-var': ['error'],
+        'prefer-destructuring': ['error'],
+        'object-shorthand': ['error'],
+        'object-curly-spacing': ['error', 'always'],
+        quotes: ['error', 'single'],
+        'quote-props': ['error', 'as-needed'],
+        'brace-style': ['error', '1tbs', { allowSingleLine: true }],
+        'prefer-template': ['error']
+    }
+};

.gitignore

@@ -1 +1,3 @@
 node_modules
+dist
+coverage

.jshintrc

@@ -1,8 +1,5 @@
 language: node_js
 node_js:
-    - "0.10"
-    - "0.11"
-
-matrix:
-    allow_failures:
-        - node_js: "0.11"
+  - 10
+  - 12
+  - 14

.travis.yml

@@ -4,29 +4,29 @@ utility box for ECMAScript language tools.
 
 ## API
 
-## `ast` 
+## `ast`
 
-### `ast.isExpression(node)` 
+### `ast.isExpression(node)`
 
 Returns `true` if `node` is an `Expression` as defined in ECMA262 edition 5.1 section
 [11](https://es5.github.io/#x11).
 
-### `ast.isStatement(node)` 
+### `ast.isStatement(node)`
 
 Returns `true` if `node` is a `Statement` as defined in ECMA262 edition 5.1 section
 [12](https://es5.github.io/#x12).
 
-### `ast.isIterationStatement(node)` 
+### `ast.isIterationStatement(node)`
 
 Returns `true` if `node` is an `IterationStatement` as defined in ECMA262 edition
 5.1 section [12.6](https://es5.github.io/#x12.6).
 
-### `ast.isSourceElement(node)` 
+### `ast.isSourceElement(node)`
 
 Returns `true` if `node` is a `SourceElement` as defined in ECMA262 edition 5.1
 section [14](https://es5.github.io/#x14).
 
-### `ast.trailingStatement(node)` 
+### `ast.trailingStatement(node)`
 
 Returns `Statement?` if `node` has trailing `Statement`.
 ```js
@@ -35,7 +35,7 @@ if (cond)
 ```
 When taking this `IfStatement`, returns `consequent;` statement.
 
-### `ast.isProblematicIfStatement(node)` 
+### `ast.isProblematicIfStatement(node)`
 
 Returns `true` if `node` is a problematic `IfStatement`. If `node` is a problematic `IfStatement`, `node` cannot be represented as an one-to-one JavaScript code.
 ```js
@@ -54,101 +54,101 @@ Returns `true` if `node` is a problematic `IfStatement`. If `node` is a problema
 The above node cannot be represented as a JavaScript code, since the top level `else` alternate belongs to an inner `IfStatement`.
 
 
-## `code` 
+## `code`
 
-### `code.isDecimalDigit(code)` 
+### `code.isDecimalDigit(code)`
 
 Return `true` if provided code is decimal digit.
 
-### `code.isHexDigit(code)` 
+### `code.isHexDigit(code)`
 
 Return `true` if provided code is hexadecimal digit.
 
-### `code.isOctalDigit(code)` 
+### `code.isOctalDigit(code)`
 
 Return `true` if provided code is octal digit.
 
-### `code.isWhiteSpace(code)` 
+### `code.isWhiteSpace(code)`
 
-Return `true` if provided code is white space. 
+Return `true` if provided code is white space.
 White space characters are formally defined in ECMA262.
 
-### `code.isLineTerminator(code)` 
+### `code.isLineTerminator(code)`
 
-Return `true` if provided code is line terminator. 
+Return `true` if provided code is line terminator.
 Line terminator characters are formally defined in ECMA262.
 
-### `code.isIdentifierStart(code)` 
+### `code.isIdentifierStart(code)`
 
-Return `true` if provided code can be the first character of ECMA262 `Identifier`. 
+Return `true` if provided code can be the first character of ECMA262 `Identifier`.
 They are formally defined in ECMA262.
 
-### `code.isIdentifierPart(code)` 
+### `code.isIdentifierPart(code)`
 
-Return `true` if provided code can be the trailing character of ECMA262 `Identifier`. 
+Return `true` if provided code can be the trailing character of ECMA262 `Identifier`.
 They are formally defined in ECMA262.
 
-## `keyword` 
+## `keyword`
 
-### `keyword.isKeywordES5(id, strict)` 
+### `keyword.isKeywordES5(id, strict)`
 
 Returns `true` if provided identifier string is a Keyword or Future Reserved Word
-in ECMA262 edition 5.1. 
+in ECMA262 edition 5.1.
 They are formally defined in ECMA262 sections
 [7.6.1.1](http://es5.github.io/#x7.6.1.1) and [7.6.1.2](http://es5.github.io/#x7.6.1.2),
-respectively. 
+respectively.
 If the `strict` flag is truthy, this function additionally checks whether
 `id` is a `Keyword` or `FutureReservedWord` under strict mode.
 
-### `keyword.isKeywordES6(id, strict)` 
+### `keyword.isKeywordES6(id, strict)`
 
 Returns `true` if provided identifier string is a `Keyword` or `FutureReservedWord`
-in ECMA262 edition 6. 
+in ECMA262 edition 6.
 They are formally defined in ECMA262 sections
 [11.6.2.1](http://ecma-international.org/ecma-262/6.0/#sec-keywords) and
 [11.6.2.2](http://ecma-international.org/ecma-262/6.0/#sec-future-reserved-words),
-respectively. 
+respectively.
 If the `strict` flag is truthy, this function additionally checks whether
 `id` is a `Keyword` or `FutureReservedWord` under strict mode.
 
-### `keyword.isReservedWordES5(id, strict)` 
+### `keyword.isReservedWordES5(id, strict)`
 
 Returns `true` if provided identifier string is a `ReservedWord` in ECMA262 edition 5.1.
 They are formally defined in ECMA262 section [7.6.1](http://es5.github.io/#x7.6.1).
 If the `strict` flag is truthy, this function additionally checks whether `id`
 is a `ReservedWord` under strict mode.
 
-### `keyword.isReservedWordES6(id, strict)` 
+### `keyword.isReservedWordES6(id, strict)`
 
 Returns `true` if provided identifier string is a `ReservedWord` in ECMA262 edition 6.
 They are formally defined in ECMA262 section [11.6.2](http://ecma-international.org/ecma-262/6.0/#sec-reserved-words).
 If the `strict` flag is truthy, this function additionally checks whether `id`
 is a `ReservedWord` under strict mode.
 
-### `keyword.isRestrictedWord(id)` 
+### `keyword.isRestrictedWord(id)`
 
 Returns `true` if provided identifier string is one of `eval` or `arguments`.
 They are restricted in strict mode code throughout ECMA262 edition 5.1 and
 in ECMA262 edition 6 section [12.1.1](http://ecma-international.org/ecma-262/6.0/#sec-identifiers-static-semantics-early-errors).
 
-### `keyword.isIdentifierNameES5(id)` 
+### `keyword.isIdentifierNameES5(id)`
 
 Return `true` if provided identifier string is an `IdentifierName` as specified in
 ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6).
 
-### `keyword.isIdentifierNameES6(id)` 
+### `keyword.isIdentifierNameES6(id)`
 
 Return `true` if provided identifier string is an `IdentifierName` as specified in
 ECMA262 edition 6 section [11.6](http://ecma-international.org/ecma-262/6.0/#sec-names-and-keywords).
 
-### `keyword.isIdentifierES5(id, strict)` 
+### `keyword.isIdentifierES5(id, strict)`
 
 Return `true` if provided identifier string is an `Identifier` as specified in
-ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6). 
-If the `strict` flag is truthy, this function additionally checks whether `id` 
+ECMA262 edition 5.1 section [7.6](https://es5.github.io/#x7.6).
+If the `strict` flag is truthy, this function additionally checks whether `id`
 is an `Identifier` under strict mode.
 
-### `keyword.isIdentifierES6(id, strict)` 
+### `keyword.isIdentifierES6(id, strict)`
 
 Return `true` if provided identifier string is an `Identifier` as specified in
 ECMA262 edition 6 section [12.1](http://ecma-international.org/ecma-262/6.0/#sec-identifiers).