初始化 NPM 项目mkdir project-namecd project-namenpm init添加开发基础包添加 TypeScript
yarn add typescript -D添加 Jest 测试工具
yarn add jest ts-jest @types/jest -D添加 @types/node
yarn add @types/node -D初始化 TypeScript 配置./node_modules/.bin/tsc --init这会在你的项目根目录新建一个 tsconfig.json 文件
现在的目录结构如下：
.├── node_modules├── package.json├── tsconfig.json└── yarn.lock文件解析tsconfig.json这是 TypeScript 的配置文件，默认仅启用了几项，我一般的配置如下：
{ "compilerOptions": { /* Basic Options */ "target": "es5" /* 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'. */, "lib": [ "es6" ] /* Specify library files to be included in the compilation. */, // "allowJs": true, /* Allow javascript files to be compiled. */ // "checkJs": true, /* Report errors in .js files. */ // "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */ "declaration": true /* Generates corresponding '.d.ts' file. */, "declarationMap": true /* Generates a sourcemap for each corresponding '.d.ts' file. */, // "sourceMap": true, /* Generates corresponding '.map' file. */ // "outFile": "./", /* Concatenate and emit output to single file. */ "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. */ // "composite": true, /* Enable project compilation */ // "incremental": true, /* Enable incremental compilation */ // "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */ // "removeComments": true, /* Do not emit comments to output. */ // "noEmit": true, /* Do not emit outputs. */ // "importHelpers": true, /* Import emit helpers from 'tslib'. */ // "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */ // "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */ /* Strict Type-Checking Options */ "strict": true /* Enable all strict type-checking options. */, "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */, "strictNullChecks": true /* Enable strict null checks. */, "strictFunctionTypes": true /* Enable strict checking of function types. */, "strictBindCallApply": true /* Enable strict 'bind', 'call', and 'apply' methods on functions. */, "strictPropertyInitialization": true /* Enable strict checking of property initialization in classes. */, "noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */, "alwaysStrict": true /* Parse in strict mode and emit "use strict" for each source file. */, /* Additional Checks */ "noUnusedLocals": true /* Report errors on unused locals. */, "noUnusedParameters": true /* Report errors on unused parameters. */, "noImplicitReturns": true /* Report error when not all code paths in function return a value. */, "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */, /* Module Resolution Options */ // "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */ // "baseUrl": "./", /* Base directory to resolve non-absolute module names. */ // "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */ // "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */ // "typeRoots": [], /* List of folders to include type definitions from. */ // "types": [], /* Type declaration files to be included in compilation. */ // "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */ "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */ // "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */ /* Source Map Options */ // "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */ // "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */ // "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */ // "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */ /* Experimental Options */ // "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */ // "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */ }, "include": ["./src/**/*"], "exclude": ["node_modules", "src/__tests__"]}package.json添加了几条 scripts：
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