Add eslint

.eslintrc.yml

@@ -0,0 +1,43 @@
+extends:
+  - "eslint:recommended"
+  - "airbnb-typescript/base"
+parserOptions:
+  project: './tsconfig.json'
+env:
+  browser: true
+  node: true
+  jest: true
+rules:
+  "@typescript-eslint/no-misused-promises":
+    - "error"
+  "@typescript-eslint/no-unused-vars":
+    - "error"
+    - argsIgnorePattern: "type|_*"
+  class-methods-use-this: "off"
+  consistent-return: off
+  func-names: "off"
+  global-require: "off"
+  import/no-cycle: "off"
+  import/prefer-default-export: "off"
+  import/extensions: "off"
+  import/no-extraneous-dependencies: "off"
+  max-classes-per-file: "off"
+  max-len:
+    - "error"
+    - code: 120
+  no-bitwise:
+    - "error"
+    - allow:
+        - "^"
+  no-param-reassign: "off"
+  no-unused-vars: "off"
+  object-curly-newline:
+    - "error"
+    - consistent: true
+overrides:
+- files:
+    - "tests/*.test.ts"
+  rules:
+    no-await-in-loop: "off"
+ignorePatterns:
+    - "build/"

.vscode/settings.json

@@ -0,0 +1,14 @@
+{
+    "editor.codeActionsOnSave": {
+        "source.fixAll.eslint": "always"
+    },
+    "files.exclude": {
+        "**/.git": true,
+        "**/build": true,
+        "**/node_modules": true
+    },
+    "files.trimTrailingWhitespace": true,
+    "prettier.singleQuote": true,
+    "prettier.trailingComma": "all",
+    "editor.tabSize": 2
+}

index.ts

@@ -1 +1 @@
-console.log("Hello World!");
+console.log('Hello World!');

package.json

@@ -7,6 +7,11 @@
   "author": "Eric Chang <[email protected]>",
   "dependencies": {},
   "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^7.0.0",
+    "@typescript-eslint/parser": "^7.0.0",
+    "eslint": "^8.57.1",
+    "eslint-config-airbnb-typescript": "^18.0.0",
+    "eslint-plugin-import": "^2.31.0",
     "typescript": "^5.6.3"
   }
 }