Migrate to TypeScript

.circleci/scripts/deps-install.sh

@@ -5,4 +5,4 @@ set -e
 set -u
 set -o pipefail
 
-yarn --frozen-lockfile --ignore-scripts --har
+yarn --frozen-lockfile --har

.eslintignore

@@ -0,0 +1,3 @@
+*.js
+*.d.ts
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,21 @@
+module.exports = {
+  root: true,
+  extends: [
+    '@metamask/eslint-config',
+    '@metamask/eslint-config/config/typescript',
+  ],
+  rules: {
+    '@typescript-eslint/no-extra-parens': 'off',
+  },
+  overrides: [{
+    files: [
+      '.eslintrc.js',
+    ],
+    parserOptions: {
+      sourceType: 'script',
+    },
+    extends: [
+      '@metamask/eslint-config/config/nodejs',
+    ],
+  }],
+};

.gitignore

@@ -1,3 +1,6 @@
+*.js
+*.map
+*.d.ts
 
 # misc
 .DS_Store

package.json

@@ -2,13 +2,13 @@
   "name": "eth-json-rpc-errors",
   "version": "2.0.2",
   "description": "Ethereum JSON RPC and Provider errors.",
-  "main": "index.js",
+  "main": "src/index.js",
   "scripts": {
-    "build": "echo",
-    "test": "node test",
-    "test:coverage": "nyc tape test",
-    "lint": "eslint index.js",
-    "lint:fix": "eslint index.js --fix"
+    "build": "tsc --project .",
+    "test": "yarn build && tape test/**/*.js",
+    "test:coverage": "yarn build && nyc tape test/**/*.js",
+    "lint": "eslint --ext .ts,.js .",
+    "lint:fix": "eslint --ext .ts,.js --fix ."
   },
   "repository": {
     "type": "git",
@@ -28,10 +28,16 @@
   },
   "homepage": "https://github.com/MetaMask/eth-json-rpc-errors#readme",
   "devDependencies": {
-    "eslint": "^6.1.0",
+    "@metamask/eslint-config": "^2.0.0",
+    "@types/tape": "^4.2.34",
+    "@typescript-eslint/eslint-plugin": "^2.20.0",
+    "@typescript-eslint/parser": "^2.20.0",
+    "eslint": "^6.8.0",
+    "eslint-plugin-import": "^2.20.1",
     "fast-deep-equal": "^2.0.1",
     "nyc": "^14.1.1",
-    "tape": "^4.11.0"
+    "tape": "^4.11.0",
+    "typescript": "^3.8.2"
   },
   "dependencies": {
     "fast-safe-stringify": "^2.0.6"