无法解析另一个文件中的 Typescript 模块

Question

我正在将我的 React 应用程序迁移到 typescript。它现在工作正常，但是在添加 typescript 编译器并将文件重命名为 .ts 和 .tsx 之后，找不到它的投掷模块。 任何线索都会有所帮助。 我有以下目录结构。

| src
  | select.tsx
  | index.ts
  | WindowedSelect.tsx
  | MenuList.tsx
| demo
  | index.tsx
| webpack.config.demo.js
| webpack.config.js
| tsconfig.json
| package.json

我为npm start命令运行 demo/index ( webpack.config.demo )，为npm run build命令运行 src/index.tsx (webpack.config)。 但是在两者中都找不到 Moddule Not found 错误。

错误（npm 启动）：

ERROR in ./demo/index.tsx
Module not found: Error: Can't resolve '../src/WindowedSelect'

错误（npm 运行构建）：

ERROR in ./src/index.ts
Module not found: Error: Can't resolve './MenuList'

ERROR in ./src/index.ts
Module not found: Error: Can't resolve './WindowedSelect'

IntelliSense 工作正常并在单击时导航到相应的文件。 我不明白这里的问题是什么。

PS：除了module not found错误，还有几个类型错误，因为这是一个js项目。 计划是逐步迁移到typescript。那么如何设置类型错误的默认严重性为“警告”呢？

webpack.config.js

const path = require('path');

module.exports = {
  entry: './src/index.ts',
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist'),
    libraryTarget: 'commonjs2',
  },
  module: {
    rules: [
      {
        test: /\.(ts|tsx)$/,
        exclude: /node_modules/,
        use: {
          loader: "ts-loader"
        }
      }
    ]
  },
  externals: {
    react: 'commonjs react',
    'react-dom': 'commonjs react-dom'
  },
};

编辑：tsconfig.json

{
  "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. */
      "DOM",
      "DOM.Iterable",
      "ESNext"
    ],
    "allowJs": true,                          /* Allow javascript files to be compiled. */
    // "checkJs": true,                       /* Report errors in .js files. */
    "jsx": "react",                           /* 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": "./",                        /* 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": false,                           /* Enable all strict type-checking options. */
    "noImplicitAny": false,                 /* Raise error on expressions and declarations with an implied 'any' type. */
    "strictNullChecks": false,              /* Enable strict null checks. */
    "strictFunctionTypes": false,           /* Enable strict checking of function types. */
    "strictBindCallApply": false,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
    "strictPropertyInitialization": false,  /* Enable strict checking of property initialization in classes. */
    "noImplicitThis": false,                /* Raise error on 'this' expressions with an implied 'any' type. */
    "alwaysStrict": false,                  /* 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. */
    // "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. */
  }
}

Answer 1

听起来这个问题很可能是因为缺少指出webpack.config中的解析扩展。 尝试添加更多该属性：

resolve: {
  extensions: ['.ts', '.tsx', '.js', '.jsx'],    
},

Answer 2

经过几个小时的搜索，这对我有用：

npm install --save-dev typescript @types/node @types/react @types/react-dom @types/jest --force

然后我创建了一个tsconfig.json文件并粘贴了以下代码：

{
  "compilerOptions": {
    "target": "es5",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": ["src"]
}

最后，我重新启动了应用程序。