Typescript 和 Node.js 错误“语法错误:无法在模块外使用导入语句”

运行 rpm run start 后,打印错误:语法错误:无法在模块外使用导入语句。 注意:我将它与 GCP Cloud Run 一起使用。

package.json

import React,{ useState,useEffect } from 'react';

const App = () => {
  const [matchs,setMatchs] = useState(window.matchMedia("(min-width: 768px)").matches)

  useEffect(() => {
    const handler = (e) => setMatchs( e.matches );
    window.matchMedia("(min-width: 768px)").addListener(handler);
  },[]);

  return (
    <div >
      {matchs && (<h1>Big Screen</h1>)}
      {!matchs && (<h3>Small Screen</h3>)}
    </div>
  );
}

export default App;

然后我有一个名为 src 的文件夹,其中包含 index.ts 中的导入语句的文件(请参阅文件结构的屏幕截图)。

Typescript 和 Node.js 错误“语法错误:无法在模块外使用导入语句”

这是导入语句代码:

 {
  "name": "auth-api-public","version": "0.0.1","main": "src/index.ts","type": "module","scripts": {
    "start": "node src/index.ts","lint": "eslint src/**.ts","fix": "eslint --fix *.ts"
  },"author": "Jacob Miller","engines": {
    "node": ">=12.0.0"
  },"dependencies": {
    "@google-cloud/secret-manager": "^3.9.0","express": "^4.17.1","firebase-admin": "^9.11.0","stytch": "^3.0.2"
  },"devDependencies": {
    "@typescript-eslint/eslint-plugin": "^3.9.1","@typescript-eslint/parser": "^3.8.0","eslint": "^7.30.0","eslint-config-google": "^0.14.0","eslint-config-prettier": "8.3.0","eslint-plugin-import": "^2.23.4","eslint-plugin-node": "11.1.0","eslint-plugin-promise": "5.1.0"
  }
}

这是 tsconfig.json

import * as express from "express";
import * as stytch from "stytch";
import * as admin from "firebase-admin";

“编译器选项”:{ "目标": "es5","module": "commonjs",“声明”:真实, "outDir": "./dist",“严格”:真实, "esModuleInterop": 真,"forceConsistentCasingInFileNames": 真 } }

{

然后是运行 npm run start 后的错误信息截图:

Typescript 和 Node.js 错误“语法错误:无法在模块外使用导入语句”

chenelaine 回答:Typescript 和 Node.js 错误“语法错误:无法在模块外使用导入语句”

我希望 Typescript 是全局安装的 (npm i -g typescript)。除了安装 JavaScript npm,你还应该安装 Typescript 版本。下面是一个例子,如何做到这一点,
npm install express @types/express
对存在 Typescript 版本的所有 npm 模块执行此操作。在这里分享 tsconfig.json 的配置。确保你在那里使用 commonjs。

检查以下配置是否适合您。

{
  "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. */
    // "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 */
    // "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. */
    // "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. */
  }
}                                                                                                                 ```
,

您可以查看 Stackoverflow Questions 12,其中 OP 也遇到过类似的错误。

在上述两种情况下,问题都已通过在 package.json 文件中的 Type 字段中添加值“module”得到解决。

语法:

            {
               “Type” : “module”
           
            }

请检查是否正确添加了类型值,并确保您正在使用 Nodejs 的最新版本,如果版本在 13 之前,那么您还必须在 package.json 文件中添加一个标志以及以上变化。

语法:

         node --experimental-modules program.js
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