尝试在javascript express应用程序中使用typescript库

Question

我正在尝试使用像this这样的typescript库来创建一个现有的express nodejs应用程序。但它不起作用。当我导入库函数时，它给出了一些错误，比如不能读取未定义的属性‘构造函数’。

我也正在将ts文件编译成js文件。有没有其他方法可以在现有的node js应用程序中使用typescript？

下面是错误堆栈

"stack": "TypeError: Cannot read property 'constructor' of undefined\n    at MetadataStorage.getAncestors (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/metadata/MetadataStorage.js:199:73)\n    at MetadataStorage.getMetadata (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/metadata/MetadataStorage.js:146:36)\n    at MetadataStorage.getExposedMetadatas (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/metadata/MetadataStorage.js:91:21)\n    at MetadataStorage.getExposedProperties (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/metadata/MetadataStorage.js:97:21)\n    at TransformOperationExecutor.getKeys (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/TransformOperationExecutor.js:328:70)\n    at TransformOperationExecutor.transform (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/TransformOperationExecutor.js:110:29)\n    at ClassTransformer.plainToClass (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/ClassTransformer.js:17:25)\n    at plainToClass (/Users/saurabhkumar/platform/rest-api-service/node_modules/class-transformer/index.js:20:29)\n    at Object.<anonymous> (/Users/saurabhkumar/platform/rest-api-service/build/src/api/controllers/source.controller.js:67:22)\n    at Generator.next (<anonymous>)\n    at /Users/saurabhkumar/platform/rest-api-service/build/src/api/controllers/source.controller.js:7:71\n    at new Promise (/Users/saurabhkumar/platform/rest-api-service/node_modules/es6-shim/es6-shim.js:2393:11)\n    at __awaiter (/Users/saurabhkumar/platform/rest-api-service/build/src/api/controllers/source.controller.js:3:12)\n    at exports.create (/Users/saurabhkumar/platform/rest-api-service/build/src/api/controllers/source.controller.js:58:38)\n    at Layer.handle [as handle_request] (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/layer.js:95:5)\n    at next (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/route.js:137:13)\n    at /Users/saurabhkumar/platform/rest-api-service/build/src/api/controllers/auth.controller.js:12:13\n    at Layer.handle [as handle_request] (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/layer.js:95:5)\n    at next (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/route.js:137:13)\n    at Route.dispatch (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/route.js:112:3)\n    at Layer.handle [as handle_request] (/Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/layer.js:95:5)\n    at /Users/saurabhkumar/platform/rest-api-service/node_modules/express/lib/router/index.js:281:22"

Answer 1

如果你只想要这里和前面的打字脚本，而不关心已经写好的js文件，你可以把它作为js文件……

确保使用allowJs: true配置了tsconfig，或者只使用此选项运行tsc。

查看allowJs选项，首先是编译器选项：https://www.typescriptlang.org/docs/handbook/compiler-options.html#compiler-options