文章目录
- 前言
- 一、明确需求
- 粗略设计
- 二、创建项目
- 1. 新建文件夹
- 2. 初始化项目
- 3. 安装依赖
- 4. 创建项目结构
- 5. 配置ts
- 6. 配置项目启动命令
- 7. 运行项目
- 8. 测试多模块
前言
试想一下这么一个情况，你想要对一些数据或文件进行批量处理，但是你用的编程语言比较顺手的或者工作使用的编程语言是Typescript或者Javascript，因此想要使用Typescript来实现这些操作。
当然，要想完成这个工作，哪怕你使用python,shell也是可以完成的，但是这里只谈论使用Typescript.
现在就是这个情况，我想要写一个nodejs的TS项目，能够编译我写的代码，并且执行代码，得到我想要的结果。
一、明确需求
既然知道了目标，那么就要先明确一下需求。
现在就是这个情况，我想要写一个nodejs的TS项目，能够编译我写的代码，并且执行代码，得到我想要的结果。
从这里可得到以下信息：
- 项目是使用nodejs，编程语言是Typescript
- 要能编译ts代码
- 最后执行ts代码，得到想要的输出结果。
粗略设计
- 首先定义一个build输出目录，遵从一般的项目标准，使用
./dist - 定义一个入口文件，ts编译后是js，那么入口文件就是
./dist/index.js - 使用命令来执行操作，一个
build用来编译代码，一个dev来编译和执行。 - 源码的入口文件是
src/index.ts
二、创建项目
使用你的包管理工具（我使用的是pnpm，如果你使用的是npm、yarn或者其他包管理工具，则执行相同的操作即可），初始化一个项目
1. 新建文件夹
mkdir my_project
cd my_project
2. 初始化项目
pnpm init
然后就是输入各种项目信息，创建完毕后当前目录会多出一个package.json文件，内容如下
{
"name": "my_project",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC"
}
3. 安装依赖
这里主要是安装typescript的编译依赖和支持nodejs库的一些依赖。
pnpm install typescript @types/node
然后使用npx来初始化一下typescript的配置文件
npx tsc --init
此时当前目录下会多出一个tsconfig.json，这个是全局的ts配置文件，内容如下
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
// "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
// "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
// "rootDir": "./", /* Specify the root folder within your source files. */
// "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */
// "allowImportingTsExtensions": true, /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
// "resolvePackageJsonExports": true, /* Use the package.json 'exports' field when resolving package imports. */
// "resolvePackageJsonImports": true, /* Use the package.json 'imports' field when resolving imports. */
// "customConditions": [], /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
// "noUncheckedSideEffectImports": true, /* Check side effect imports. */
// "resolveJsonModule": true, /* Enable importing .json files. */
// "allowArbitraryExtensions": true, /* Enable importing files with any extension, provided a declaration file is present. */
// "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
// "outDir": "./", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
/* Interop Constraints */
// "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "verbatimModuleSyntax": true, /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
// "isolatedDeclarations": true, /* Require sufficient annotation on exports so other tools can trivially generate declaration files. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "strictBuiltinIteratorReturn": true, /* Built-in iterators are instantiated with a 'TReturn' type of 'undefined' instead of 'any'. */
// "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */
// "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
}
}
文件中有一些注释，读者可自行观看，我们这里只实现我们的目的。
4. 创建项目结构
接下来创建项目的目录结构，其实最主要的就是创建src目录，然后在src目录下新建个index.ts，至于其他的目录我们还是要用代码去创建。目录结构创建好后，如下图所示
5. 配置ts
ts的配置的话主要是以下内容
- 保存时编译
- 语法用最新的
- 开启sourceMap,方便调试
- 设置输出目录
- 设置源码目录
- 设置包含的ts文件
- 设置排除的ts文件
如果你有兴趣可以到上面的文档或者ts官方学习一下如何配置，我这里给出完整配置
{
"compileOnSave": true,
"compilerOptions": {
"module": "ES2022",
"noImplicitAny": true,
"removeComments": true,
"preserveConstEnums": true,
"sourceMap": true,
"declaration": false,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "ES2023",
"moduleResolution": "Node",
"outDir": "./dist",
"lib": ["ESNext"],
"esModuleInterop": true,
"rootDir": "./src"
},
"files": ["./src/index.ts"],
"include": ["src/**/*.ts"],
"exclude": ["node_modules", "tmp"]
}
6. 配置项目启动命令
按照之前的需求，来编写项目启动命令。
{
"name": "schemas",
"version": "1.0.0",
"description": "",
"main": "index.js",
"type": "module",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"dev": "tsc && node dist/index.js"
},
"keywords": [],
"type": "module",
"author": "",
"license": "ISC",
"dependencies": {
"typescript": "^5.6.3"
},
"devDependencies": {
"@types/node": "^22.7.5"
}
}
在工程的package.json中，scripts字段是定义执行的命令的，后面的命令代表两个意思
tsc编译当前项目node dist/index.js执行dist/index.js文件（这是因为编译了以后，输出的就是那个地方的index.js文件，这个在package.json和tsconfig.json中写了的，如果你不理解可以返回去看看）
7. 运行项目
在经过以上操作后，运行以下命令即可看到ts被编译执行了。
pnpm run dev
8. 测试多模块
对于一个ts项目来说，能创建多个ts文件是至关重要的，本来就是想着这么点便利的地方。
此时创建个test.ts文件，里面导出个test方法
const test_hello = (data: string) => {
return `hello ${data}`;
}
export default test_hello;
然后在index.ts中测试
当前只能以js后缀导入，还是感觉不太舒服的，但是这就需要集成打包工具了，这就很麻烦。
