node.js - typescript + Node 15.5.1，不能在模块外使用import语句

Question

我用打字稿构建我的快速服务器，它完成得很好，但是用最新的 nodejs 运行构建会产生以下错误。这个项目在节点 14 上运行良好。我已经尝试过 nodejs 15.4.0 和 15.5.1 ，但两者都不起作用。将 "type": "module" 添加到 package.json 会产生新错误，它使用 commonjs 进行打字稿。

import { Max } from 'class-validator'
^^^^^^

SyntaxError: Cannot use import statement outside a module

我的 package.json

{
    "name": "fleet-server",
    "version": "1.0.0",
    "main": "index.js",
    "license": "MIT",
    "scripts": {
        "start": "tsc && node build/src/index.js",
        "build": "tsc",
        "dev": "ts-node-dev --respawn src/index.ts"
    },
    "dependencies": {
        "@hapi/joi": "^17.1.1",
        "bcryptjs": "^2.4.3",
        "class-validator": "^0.12.2",
        "cookie-parser": "^1.4.5",
        "cors": "^2.8.5",
        "dotenv": "^8.2.0",
        "esm": "^3.2.25",
        "express": "^4.17.1",
        "helmet": "^4.2.0",
        "http-status-codes": "^2.1.4",
        "jsonwebtoken": "^8.5.1",
        "morgan": "^1.10.0",
        "reflect-metadata": "^0.1.13",
        "sqlite3": "^5.0.0",
        "typeorm": "^0.2.29"
    },
    "devDependencies": {
        "@types/bcryptjs": "^2.4.2",
        "@types/cookie-parser": "^1.4.2",
        "@types/cors": "^2.8.8",
        "@types/esm": "^3.2.0",
        "@types/express": "^4.17.9",
        "@types/hapi__joi": "^17.1.6",
        "@types/helmet": "^4.0.0",
        "@types/jsonwebtoken": "^8.5.0",
        "@types/morgan": "^1.9.2",
        "@types/sqlite3": "^3.1.6",
        "ts-node": "^9.0.0",
        "ts-node-dev": "^1.1.1",
        "typescript": "^4.1.2"
    }
}

tsconfig.json

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

        /* Basic Options */
        // "incremental": true,                   /* Enable incremental compilation */
        "target": "ES6" /* 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": "./build/index.js" /* Concatenate and emit output to single file. */,
        "outDir": "./build" /* 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": false /* 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": ["@types", "./node_modules/@types"] /* 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. */,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true
    },

    "include": ["src/**/*"],
    "exclude": ["node_modules"]
}

标签： node.jstypescriptes6-modules