Migrate to TypeScript and add type definitions

.eslintrc.js

@@ -1,13 +1,17 @@
 module.exports = {
-  extends: 'google',
-  env: {
-    node: true,
-    mocha: true
-  },
+  root: true,
+  parser: '@typescript-eslint/parser',
   plugins: [
-    'pabigot'
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
   ],
   rules: {
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-unused-vars': 'off',
     'guard-for-in': 'off',
     'prefer-rest-params': 'off',
     'prefer-spread': 'off',
@@ -23,12 +27,6 @@ module.exports = {
     'no-irregular-whitespace': ['error', {skipComments: true}],
     'no-multi-spaces': ['error', {ignoreEOLComments: true}],
     'operator-linebreak': ['error', 'before'],
-    'pabigot/affixed-ids': ['error', {
-      allowedSuffixes: [
-        '_dCel',
-        '_ppt'
-      ]
-    }],
     quotes: ['error', 'single', {
       avoidEscape: true,
       allowTemplateLiterals: true
@@ -40,6 +38,6 @@ module.exports = {
     yoda: ['error', 'always', {exceptRange: true}]
   },
   parserOptions: {
-    sourceType: 'module'
+    project: './tsconfig.json',
   }
-}
+};

.gitignore

@@ -1,3 +1,4 @@
 /CHANGELOG.html
 /coverage/
 /node_modules/
+/lib/

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Change Log
 
+## [3.0.0] - 2021-07-08
+
+* **API** Renamed `const` function to [constant][doc:constant].
+* Migrate to TypeScript and make type definitions available from npm.
+
 ## [2.0.0] - 2021-07-08
 
 * Improve [browser compatibility][pr#28] by adding a browser polyfill

package.json

@@ -1,6 +1,6 @@
 {
   "name": "buffer-layout",
-  "version": "2.0.0",
+  "version": "3.0.0",
   "description": "Translation between JavaScript values and Buffers",
   "keywords": [
     "Buffer",
@@ -17,27 +17,34 @@
   "license": "MIT",
   "author": "Peter A. Bigot <[email protected]>",
   "main": "./lib/Layout.js",
+  "types": "./lib/Layout.d.ts",
+  "files": [
+    "/lib"
+  ],
   "dependencies": {
     "buffer": "~6.0.3"
   },
   "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^4.28.2",
+    "@typescript-eslint/parser": "^4.28.2",
     "coveralls": "^3.0.0",
-    "eslint": "~4.18.2",
-    "eslint-config-google": "~0.9.1",
-    "eslint-plugin-pabigot": "~1.1.0",
+    "eslint": "~7.30.0",
     "istanbul": "~0.4.5",
     "jsdoc": "~3.5.5",
     "lodash": "~4.17.5",
-    "mocha": "~5.0.4"
+    "mocha": "~5.0.4",
+    "typescript": "~4.3.5"
   },
   "engines": {
     "node": ">=5.10"
   },
   "scripts": {
-    "coverage": "istanbul cover _mocha -- -u tdd",
-    "coveralls": "istanbul cover _mocha --report lcovonly -- -u tdd && cat ./coverage/lcov.info | coveralls",
-    "eslint": "eslint lib/ test/",
+    "build": "tsc",
+    "coverage": "npm run build && istanbul cover _mocha -- -u tdd",
+    "coveralls": "npm run build && istanbul cover _mocha --report lcovonly -- -u tdd && cat ./coverage/lcov.info | coveralls",
+    "eslint": "eslint src/ --ext .ts",
     "jsdoc": "jsdoc -c jsdoc/conf.json",
-    "test": "mocha -u tdd"
+    "prepare": "npm run build",
+    "test": "npm run build && mocha -u tdd"
   }
 }