这更多是我在使用 AJV 和 Typescript 时面临的一个问题。我在 ajv 存储库中提出了类似的问题，但找不到真正的解决方案。
我正在尝试从 ajv 导入 Ajv 模块，如下所示:
从“ajv;导入Ajv;
并且，像我以前在纯 JavaScript 中那样使用它。
const ajv = new Ajv({ allErrors: true });
但是，我从 ts 编译器收到一个错误，如下所示:
error TS2351: This expression is not constructable.
Type 'typeof import("/Users/username/Documents/node_modules/ajv/dist/ajv")' has no construct signatures.
const ajv = new Ajv({ allErrors: true });
我在导入过程中是否做错了什么？
我的TS配置文件如下:
`{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
/* Language and Environment */
"target": "ES6", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
/* Modules */
"module": "Node16", /* Specify what module code is generated. */
"moduleResolution": "Node16", /* Specify how TypeScript looks up a file from a given module specifier. */
/* JavaScript Support */
/* Emit */
"outDir": "./dist", /* Specify an output folder for all emitted files. */
/* Interop Constraints */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true, /* Skip type checking all .d.ts files. */
"sourceMap": true,
"rootDir": "src",
"declaration": true,
"types": ["node", "mocha"]
},
"include": ["src/**/*", ".env"],
"exclude": ["dist/**/*", "node_modules", "test/**/*"]
}
`
如果有帮助，我们将不胜感激。非常感谢....
我期望 TS 编译器不会出现错误，因为我在部署过程中构建 JS 文件。
最佳答案
这是 CommonJS 与 ES 模块的错误。
像这样更改导入:
import _Ajv from "ajv";
const Ajv = _Ajv as unknown as typeof _Ajv.default;
现在它应该是可构造的:
const ajv = new Ajv();
我在这里找到了解决方案:https://github.com/ajv-validator/ajv/issues/2132#issuecomment-1290409907
关于javascript - 错误 TS2351 : This expression is not constructable.(带有 TypeScript 的 AJV)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/75228565/