webpack

• 重新温习下webpack

// 引入一个包
const path = require('path');

// 自动构建html文件
const HTMLWebpackPlugin = require('html-webpack-plugin')

module.exports = {
    // 入口文件
    entry: '/src/index.ts',

    // 指定打包文件所在目录
    output: {
        // 指定目录
        path: path.resolve(__dirname, 'dist'),
        // 打包后的文件名称
        filename: 'bundle.js'
    },

    //指定webpack打包时要是用的模块
    module: {
        // 指定要加在的规则
        rules: [
            {
                // test指定规则生效的文件
                test: /\.ts/,
        // 要使用的loader
        use: 'ts-loader',
        // 要排除的文件
        exclude: /node_modules/
            }
        ]
    },

    // 配置webpack插件
    plugins: [
        new HTMLWebpackPlugin(),
    ],

    // 设置项目运行环境
    mode: 'development'
};

typescript

初始化 typescript

• tsc --init 命令行生成 tsconfig.json 文件

// tsconfig.json

{
  /* 
      tsconfig.json  是ts编译器的配置文件，ts编译器可以根据它的信息对代码进行编译
      "include" 指定需要编译的文件
      "exclude" 指定不需要变异的文件
  */
    "include": [
        "./src/**/*" // **所有目录 *所有文件
  ],
  
    // "exclude": [
    //   "./src/hello/**/*"
  // ]
  

  "compilerOptions": {
    /* Visit https://aka.ms/tsconfig.json to read more about this file */

    /* Basic Options */
    // "incremental": true,                         /* Enable incremental compilation */
    "target": "es5",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */
    "module": "commonjs",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    // "lib": [],                                   /* Specify library files to be included in the compilation. */
    
    // 是否对js文件编译
    // "allowJs": true,                             /* Allow javascript files to be compiled. */

    // 是否检查js代码
    // "checkJs": true,                             /* Report errors in .js files. */

    // "jsx": "preserve",                           /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */
    // "declaration": true,                         /* Generates corresponding '.d.ts' file. */
    // "declarationMap": true,                      /* Generates a sourcemap for each corresponding '.d.ts' file. */
    // "sourceMap": true,                           /* Generates corresponding '.map' file. */

    // 编译后将代码合并为一个的文件
    // 设置outFile后，所有全局做哦永玉中的代码会合并到同一文件中
    // "outFile": "./app.js",                             /* 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 */
    // "tsBuildInfoFile": "./",                     /* Specify file to store incremental compilation information */

    // 是否删除注释
    // "removeComments": true,                      /* Do not emit comments to output. */

    // 是否生成编译后的文件
    // "noEmit": true,                              /* Do not emit outputs. */

    // 错误时是否生成编译后文件
    // "noEmitOnError": true,

    // "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'). */

    
    // 严格检查总开关
    /* Strict Type-Checking Options */
    "strict": true,                                 /* Enable all strict type-checking options. */

    // 是否允许有隐式any
    // "noImplicitAny": true,                       /* Raise error on expressions and declarations with an implied 'any' type. */

    // 是否严格的检查空值
    // "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. */

    // 是否允许有不明确类型的this
    // "noImplicitThis": true,                      /* Raise error on 'this' expressions with an implied 'any' type. */

    // 是否启用严格模式
    // "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. */
    // "noUncheckedIndexedAccess": true,            /* Include 'undefined' in index signature results */
    // "noImplicitOverride": true,                  /* Ensure overriding members in derived classes are marked with an 'override' modifier. */
    // "noPropertyAccessFromIndexSignature": true,  /* Require undeclared properties from index signatures to use element accesses. */

    /* 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. */
    // "allowUmdGlobalAccess": true,                /* Allow accessing UMD globals from modules. */

    /* 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. */

    /* Advanced Options */
    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
  }
}