chore: add ESLint plugins for Jest, TypeScript (#550)

.eslintrc.js

@@ -0,0 +1,42 @@
+module.exports = {
+  root: true,
+  env: {
+    es6: true,
+    node: true,
+    browser: true,
+  },
+  extends: ["eslint:recommended"],
+  parserOptions: {
+    ecmaVersion: 2022,
+    sourceType: "module",
+  },
+  globals: {
+    jestPuppeteer: "readonly",
+    page: "readonly",
+  },
+  overrides: [
+    {
+      files: ["*.test.?(m|t)js"],
+      env: {
+        "jest/globals": true,
+      },
+      plugins: ["jest"],
+    },
+    {
+      files: ["*.ts"],
+      extends: "plugin:@typescript-eslint/recommended",
+      parser: "@typescript-eslint/parser",
+      parserOptions: {
+        project: [
+          "./tsconfig.json",
+          "./packages/expect-puppeteer/tsconfig.json",
+          "./packages/jest-dev-server/tsconfig.json",
+          "./packages/jest-environment-server/tsconfig.json",
+          "./packages/jest-puppeteer/tsconfig.json",
+        ],
+        tsconfigRootDir: __dirname,
+      },
+      plugins: ["@typescript-eslint"],
+    },
+  ],
+};