Cannot find module './evaluation-context' or its corresponding type declarations.

[ramtinsoltani]

I'm trying to setup Flagsmith in my Angular project and I cannot get the project compiled after installing flagsmith package from NPM and initializing it like below after following the documentation:

import { Injectable } from '@angular/core';
import flagsmith from 'flagsmith';
import { IFlags, IRetrieveInfo, LoadingState } from 'flagsmith/types';
import { environment } from 'src/environments/environment';

@Injectable({
  providedIn: 'root'
})
export class FlagsmithService {

  constructor() { }

  public init(): void {

    flagsmith.init({
      environmentID: environment.FLAGSMITH_ENV_ID,
      api: environment.FLAGSMITH_API,
      cacheFlags: true,
      enableAnalytics: true,
      onChange: this.onChange.bind(this)
    });

  }

  private onChange(oldFlags: IFlags<string> | null, params: IRetrieveInfo, loadingState: LoadingState): void {

    // ...

  }

}

The error is:

Error: node_modules/flagsmith/types.d.ts:1:86 - error TS2307: Cannot find module './evaluation-context' or its corresponding type declarations.

1 import { EvaluationContext, IdentityEvaluationContext, TraitEvaluationContext } from "./evaluation-context";

I can't find evaluation-context.ts in the installed package, but I see it in this repository. This is the documentation I have followed: https://docs.flagsmith.com/clients/javascript

Any idea why I'm getting this error and why this file is missing from the NPM package? I have tried the latest version as well as v8.* to no avail.

I'm also a bit confused about the documentation as the NPM package has marked environmentID in IInitConfig interface deprecated (@deprecated — Please consider using evaluationContext.identity: IInitConfig.evaluationContext.) while I can't find anything in the documentation about this.

[matthewelwell]

Hi @ramtinsoltani , can you please confirm which version of the client you are using?

[tiagoapolo]

Fixed on https://github.com/Flagsmith/flagsmith-js-client/releases/tag/9.0.1

[ramtinsoltani]

@tiagoapolo @matthewelwell I just updated to the latest version 9.0.1 (was using 9.0.0 previously) and the problem is still there when running the application using ng serve or building it with ng build --aot:

Error: node_modules/flagsmith/types.d.ts:1:86 - error TS2307: Cannot find module './evaluation-context' or its corresponding type declarations.

1 import { EvaluationContext, IdentityEvaluationContext, TraitEvaluationContext } from "./evaluation-context";

I'm using npm install flagsmith (installed "flagsmith": "^9.0.1", in package.json) with Angular 18.2 and TypeScript 5.5.4

[kyle-ssg]

Hi @ramtinsoltani although I cannot replicate this in an angular project, I can see why it would occur. Also you are correct to question the evaluation context - we've un-deprecated its predecessors whilst we document it further.

If you're able, could you confirm that flagsmith@9.0.2-beta.1 resolves your issue? This version will also un-deprecate the fields mentioned as they were missed in our previous build.

Thanks

[ramtinsoltani]

@kyle-ssg Thank you for your response. I just tried flagsmith@9.0.2-beta.1 and the Angular build went through successfully.

[kyle-ssg]

@ramtinsoltani This is now released in flagsmith@9.0.2, thanks for raising!