1. 安装依赖

   λ yarn add typescript types/node concurrently nodemon wait-on -D

2. 初始化一个 tsconfig.json

   λ ./node_modules/.bin/tsc --init

3. 编写 tsconfig.json

   {
   "compilerOptions": {
   "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. /, "module": "commonjs" / Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. /, "outDir": "./dist" / Redirect output structure to the directory. /, "rootDir": "./" / Specify the root directory of input files. Use to control the output directory structure with --outDir. /, "baseUrl": "./", "removeComments": true / 不要向输出发出注释。 /, "strict": true / Enable all strict type-checking options. /, "esModuleInterop": true / Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. /, "experimentalDecorators": true / 为ES7装饰器提供实验支持。 /, "emitDecoratorMetadata": true / 装饰器支持. */
   },
   "exclude": ["node_modules"]
   }

4. 创建 tsconfig.build.json

   {
   "extends": "./tsconfig.json",
   "exclude": ["node_modules", "dist"]
   }

5. 创建 nodemon.json

   {
   "watch": ["dist"],
   "ext": "js",
   "exec": "node dist/index"
   }

6. package.json

   {
   "scripts": {
   "start": "concurrently --handle-input \"wait-on ./dist/index.js && nodemon\" \"tsc -w -p tsconfig.build.json\" "
   },
   "devDependencies": {
   "@types/node": "^12.0.7",
   "typescript": "^3.5.1",
   "wait-on": "^3.2.0",
   "concurrently": "^4.1.0",
   "nodemon": "^1.19.1"
   }
   }

   λ npm start

• 安装jest的vscode插件也行

1. 安装依赖

   λ npm i -D @types/jest jest ts-jest ts-node

2. 增加scripts

   "scripts": {
   …
   "test": "jest",
   "coverage": "jest --coverage"
   }

3. 设置VScode的launch.json

   {
   "version": "0.2.0",
   "configurations": [
   {
   "type": "node",
   "request": "launch",
   "name": "Jest Current File",
   "skipFiles": [
   "/" ], "program": "${workspaceFolder}/node_modules/.bin/jest", "args": [ "${relativeFile}" ], "console": "integratedTerminal", "internalConsoleOptions": "neverOpen", "outFiles": [ "${workspaceFolder}//*.js"
   ],
   "windows": {
   "program": "${workspaceFolder}/node_modules/jest/bin/jest"
   }
   }
   ]
   }

4. 设置配置文件jest.config.js

   module.exports = {
   transform: { "^.+\.ts?$": "ts-jest" },
   testEnvironment: "node",
   testRegex: "/test/.*\.(test|spec)?\.(ts|tsx)$",
   moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"]
   };

5. 添加测试脚本 /test/test.test.ts

   it("tobe", () => {
   expect("asd").toBe("asd");
   });

6. 运行测试

   npm t

可以单独的运行ts文件，而无需编译

λ npm i -g ts-node
λ ts-node index.ts
hello ts