The first implementation.

.eslintignore

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+# Coverage directory used by tools like istanbul
+coverage
+
+# webidl2js generates automatically
+src/idl/generated

.eslintrc

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+{
+  "env": {
+    "node": true,
+    "es6": true
+  },
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  },
+  "rules": {
+    "array-bracket-spacing": "error",
+    "block-spacing": "error",
+    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
+    "camelcase": "error",
+    "comma-dangle": ["error", "only-multiline"],
+    "comma-spacing": ["error", { "before": false, "after": true }],
+    "comma-style": ["error", "last"],
+    "computed-property-spacing": ["error", "never"],
+    "eol-last": ["error"],
+    "func-call-spacing": ["error", "never"],
+    "key-spacing": ["error", { "afterColon": true }],
+    "keyword-spacing": ["error"],
+    "linebreak-style": ["error", "unix"],
+    "max-depth": ["error", 4],
+    "max-len": ["error", 80],
+    "max-nested-callbacks": ["error", 3],
+    "max-statements": ["error", 40],
+    "no-trailing-spaces": "error",
+    "object-curly-spacing": ["error", "always"],
+    "one-var-declaration-per-line": "error",
+    "operator-linebreak": ["error", "after"],
+    "quote-props": ["error", "as-needed"],
+    "quotes": ["error", "single", {
+      "allowTemplateLiterals": true,
+      "avoidEscape": true
+    }],
+    "semi": ["error", "never"],
+    "semi-spacing": "error",
+    "space-before-blocks": "error",
+    "space-before-function-paren": "error",
+    "space-in-parens": ["error", "never"],
+    "space-infix-ops": "error",
+    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
+    "arrow-body-style": ["error", "as-needed", {
+      "requireReturnForObjectLiteral": false
+    }],
+    "arrow-parens": ["error", "as-needed"],
+    "no-class-assign": "error",
+    "no-const-assign": "error",
+    "no-dupe-class-members": "error",
+    "no-duplicate-imports": "error",
+    "no-new-symbol": "error",
+    "no-useless-rename": "error",
+    "no-var": "error",
+    "object-shorthand": "error",
+    "prefer-arrow-callback": ["error", {
+      "allowNamedFunctions": true,
+      "allowUnboundThis": true
+    }],
+    "prefer-const": "error",
+    "prefer-rest-params": "error",
+    "prefer-template": "error",
+    "template-curly-spacing": "error"
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Coveralls private repository token
+.coveralls.yml
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Files generated by platform
+.DS_Store
+
+# npm lock file
+package-lock.json
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+# web-platform-tests
+test/wpt/tests/
+

.npmrc

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+package-lock=false

.nycrc

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+{
+  "include": [
+    "src"
+  ],
+  "exclude": [
+    "src/idl",
+    "test"
+  ]
+}

.travis.yml

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+sudo: false
+
+language: node_js
+
+node_js:
+  - '10'
+  - '9'
+  - '8'
+  - '7'
+  - '6'
+
+after_success: 'npm run coveralls'
+
+os:
+  - linux
+
+matrix:
+  include:
+  - name: "web-platform-test"
+    node_js: stable
+    before_script: npm run wpt:install
+    script: npx gulp wpt