I’m currently developing an extension for JupyterLab. As part of this process, I’m utilizing the InversifyJS library from npm. To use it, I have to import ‘reflect-metadata’ in my index.ts file, which I have done. However, when I create an injectable class and use it in my extension, I encounter the following error:

TypeError: getOwnMetadataKeys is not a function
    at Object.isProviderFor (Reflect.js:1135:1)
    at getProviderNoCache (Reflect.js:941:1)
    at Object.getProvider (Reflect.js:955:1)
    at GetMetadataProvider (Reflect.js:1158:1)
    at OrdinaryDefineOwnMetadata (Reflect.js:611:1)
    at decorator (Reflect.js:195:1)
    at DecorateConstructor (Reflect.js:549:1)
    at Reflect.decorate (Reflect.js:143:1)
    at push.../shared/components/localTelemetry.ts.__decorate (icons.ts:4:72)
    at ../shared/components/localTelemetry.ts (localTelemetry.ts:7:28)

This is part of my code

@injectable()
export class LocalTelemetry implements TelemetryService {
  constructor(
    @inject(NAMES.customerId)
    private customerId: string = '',
    @inject(NAMES.outputChannelTelemetry)
    private outputChannel: Logger
  ) {}

And I have imported the reflect-metadata at the index.ts 1st line.

Upon researching a solution for this error, the majority of sources suggest importing reflect-metadata at the root level file, which I have already done. I wrote Jest test cases for the Injectable class and the test cases are passing when I run them in the terminal. I’m uncertain about what I might be doing incorrectly.