Add linting

Author: toddbaert

.eslintignore

@@ -0,0 +1,2 @@
+node_modules
+dist

.eslintrc.json

@@ -0,0 +1,33 @@
+{
+	"env":{
+		 "browser":true,
+		 "es2021":true
+	},
+	"extends":[
+		 "eslint:recommended",
+		 "plugin:@typescript-eslint/recommended",
+		 "prettier"
+	],
+	"parser":"@typescript-eslint/parser",
+	"parserOptions":{
+		 "ecmaVersion":"latest",
+		 "sourceType":"module"
+	},
+	"plugins":[
+		 "@typescript-eslint"
+	],
+	"rules":{
+		 "linebreak-style":[
+				"error",
+				"unix"
+		 ],
+		 "quotes":[
+				"error",
+				"single"
+		 ],
+		 "semi":[
+				"error",
+				"always"
+		 ]
+	}
+}

.prettierrc

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "nrwl.angular-console",
+    "esbenp.prettier-vscode",
+    "firsttris.vscode-jest-runner",
+    "dbaeumer.vscode-eslint"
+  ]
+}

jest.config.ts

@@ -23,15 +23,15 @@ export default {
   // collectCoverageFrom: undefined,
 
   // The directory where Jest should output its coverage files
-  coverageDirectory: "coverage",
+  coverageDirectory: 'coverage',
 
   // An array of regexp pattern strings used to skip coverage collection
   // coveragePathIgnorePatterns: [
   //   "/node_modules/"
   // ],
 
   // Indicates which provider should be used to instrument code for coverage
-  coverageProvider: "v8",
+  coverageProvider: 'v8',
 
   // A list of reporter names that Jest uses when writing coverage reports
   // coverageReporters: [
@@ -100,7 +100,7 @@ export default {
   // notifyMode: "failure-change",
 
   // A preset that is used as a base for Jest's configuration
-  preset: "ts-jest",
+  preset: 'ts-jest',
 
   // Run tests from one or more projects
   // projects: undefined,
@@ -144,7 +144,7 @@ export default {
   // snapshotSerializers: [],
 
   // The test environment that will be used for testing
-  testEnvironment: "node",
+  testEnvironment: 'node',
 
   // Options that will be passed to the testEnvironment
   // testEnvironmentOptions: {},

package-lock.json

@@ -6,6 +6,7 @@
   "types": "./dist/types/index.d.ts",
   "scripts": {
     "test": "jest",
+    "lint": "eslint ./",
     "postbuild": "cp ./package.esm.json ./dist/esm/package.json",
     "build": "rm -R ./dist && tsc --project tsconfig.json && tsc --project tsconfig.cjs.json"
   },
@@ -38,6 +39,8 @@
   "devDependencies": {
     "@types/jest": "^27.5.0",
     "@types/node": "^17.0.31",
+    "@typescript-eslint/eslint-plugin": "^5.23.0",
+    "@typescript-eslint/parser": "^5.23.0",
     "eslint": "^8.14.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-jest": "^26.1.5",

package.json

@@ -1,8 +1,8 @@
-import { greet } from "../src/index";
+import { greet } from '../src/index';
 
-describe("greet", () => {
-  it("should return greeting", () => {
-    const result = greet("hi");
-    expect(result).toEqual("hi");
+describe('greet', () => {
+  it('should return greeting', () => {
+    const result = greet('hi');
+    expect(result).toEqual('hi');
   });
 });