add(CI): eslint, prettier, typescript for npm related install scripts

.eslintignore

@@ -0,0 +1,3 @@
+# don't ever lint node_modules
+node_modules
+.eslintrc.js

.eslintrc.js

@@ -0,0 +1,29 @@
+module.exports = {
+  root: true,
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    sourceType: "module",
+    project: "./tsconfig.json",
+  },
+  plugins: ["@typescript-eslint", "import"],
+  settings: {},
+  env: {
+    node: true,
+  },
+  rules: {
+    "import/no-duplicates": "error",
+    "no-unneeded-ternary": ["error", { defaultAssignment: false }],
+    "@typescript-eslint/no-non-null-assertion": "error",
+    "@typescript-eslint/no-explicit-any": "error",
+    "init-declarations": ["error", "always"],
+    "no-lonely-if": "error",
+    "object-shorthand": ["error", "always"],
+    "@typescript-eslint/consistent-type-assertions": [
+      "error",
+      {
+        assertionStyle: "never",
+      },
+    ],
+    eqeqeq: ["error", "smart"],
+  },
+}

.github/workflows/main.yml

@@ -92,3 +92,42 @@ jobs:
 
       - name: Test
         run: ./s/test
+
+  typescript:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Install dependencies
+        run: yarn --frozen-lockfile
+      - name: Typescript
+        run: ./s/tsc
+
+  eslint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Install dependencies
+        run: yarn --frozen-lockfile
+      - name: Lint JS
+        run: ./s/eslint
+
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Install dependencies
+        run: yarn --frozen-lockfile
+      - name: Check Formatting
+        run: ./s/prettier

.prettierignore

@@ -0,0 +1,8 @@
+build/
+node_modules/
+coverage/
+.venv/
+.mypy_cache/
+.terraform/
+.pytest_cache/
+target/

package.json

@@ -21,6 +21,11 @@
   "devDependencies": {
     "@types/node": "^14.0.13",
     "@types/node-fetch": "^2.5.7",
+    "@typescript-eslint/eslint-plugin": "^3.3.0",
+    "@typescript-eslint/parser": "^3.3.0",
+    "eslint": "^7.2.0",
+    "eslint-plugin-import": "^2.21.2",
+    "prettier": "^2.0.5",
     "typescript": "^3.9.5"
   },
   "dependencies": {

s/eslint

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -ex
+
+./node_modules/.bin/eslint 'js/*.js'

s/prettier

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -ex
+
+./node_modules/.bin/prettier --check '**/*.{js,md,yml,json}'

s/tsc

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -ex
+
+./node_modules/.bin/tsc --noEmit --project tsconfig.json