再续前缘
之前已经对ts进行了一个基础的认识，ta的基本类型以及声明方式，同时也对接口这个概念进行了一个简单的说明。那和用其他语言进行项目开发的时候，也是存在进行文件编译配置的。
初识tsconfig.json文件
以自己当前实际项目为例，你可以通过命令行：
tsc --init //初始化一个编译配置文件
运行完成之后，就能看到一个tsconfig.json文件，这个用于编译配置。简单看一下(下面看一下我现在的编译配置)：
{
// "files": ["demo.ts"],
// "exclude": ["demo.ts"],
// "include": ["demo.ts"],
"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', 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. */
// "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. */
"rootDir":"./src", //ts文件
"outDir":"./build", //编译后的文件
// "outFile": "./", /* Concatenate and emit output to single file. */
// "outDir": "./", /* 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 */
"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. */
// "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
/* 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. */
}
}
以上是初始化的ts配置文件，可以看到有很多的相关配置，说一下初级阶段常用的有哪些呢?
.json最外层属性
include
项目目录下哪些文件是需要进行编译的，路径表示：
["./项目自定义文件夹/**/*"]
* **：表示目标文件夹
* *：表示目标文件夹下的所有文件
ps：这里只是对ts文件进行编译o
exclude
项目目录下哪些文件是需要进行编译的，路径表示：
["./项目自定义文件夹/**/*"] 和include相似，功能相反；
“exclude”默认情况下会排除node_modules，bower_components，jspm_packages和
compilerOptions
该属性为编译器选项，重要的是ta下的子属性是你编译时所需要进行配置的；可以看到初始化文件下是存在很多的，简单说明一下：
* target: “es2015″ //ts编译成的js版本 如果你灭有进行配置* 默认值为：”es3”
* module: “” //模块化规范设置 默认es2015,一般也不修改
* outDir: “./dist” //输出目录 设置编译后的文件所在的目录
* rootDir:”” //目标文件目录
* outFile:”./dist/xxx” //设置将所有编译后文件合并
* lib: “” //项目所需使用的库 通常不设置，使用默认值
- “allowJs”:true //是否允许对写入js文件进行编译
- “checkJs”:true //检查js文件是否符合模块化规范
-
“removeComments” :true //编译后的文件是否移除注释
- “noEmit”:true //不生成编译后的文件，默认为false
-
“noEmitOnError”:true //报错后不生成编译文件
-
“strict”: true //是否启用严格 建议设置为true
- “alwaysStrict”:false //编译文件是否使用严格模式
- “noImplicitAny”:true //不允许隐式类型any
- “noImplicitThis”:false //不允许不明确类型的this
- “strictNullChecks”:false //严格是否为空
详细请去官网编译选项
转载请注明原文链接：TypeScript之配置文件(tsconfig.json)
