Typescript and RxJS: Resolving Incompatibility Issues

In my development setup, I work with two repositories known as web-common and A-frontend. Typically, I use npm link web-common from within A-frontend. Both repositories share various dependencies such as React, Typescript, Google Maps, MobX, etc. Up until recently, this workflow has been seamless for me. However, after introducing RxJS, I started encountering errors like the following:

TS2345: Argument of type 'import("/Users/fharvey/code/monolith/A-frontend/node_modules/rxjs/internal/types").OperatorFunction<import("/Users/fharvey/code/monolith/web-common/services/scaffold/replay_pb").ReplayAllMessagesResult, import("/Users/fharvey/code/monolith/A-frontend/src/app/components/pages/RobotReporting/index").TypeSiloCollec...' is not assignable to parameter of type 'import("/Users/fharvey/code/monolith/web-common/node_modules/rxjs/internal/types").OperatorFunction<import("/Users/fharvey/code/monolith/web-common/services/scaffold/replay_pb").ReplayAllMessagesResult, import("/Users/fharvey/code/monolith/A-frontend/src/app/components/pages/RobotReporting/index").TypeSiloCollecti...'.
  Types of parameters 'source' and 'source' are incompatible.

This essentially points out that 

~"A-frontend/node_modules/rxjs/internal/types".OperatorFunction
does not match with 
~"web-common/node_modules/rxjs/internal/types".OperatorFunction
. While there are resources addressing this issue:

The tricky part here is that this discrepancy only occurs in my production build, not in the development environment.

Common Webpack Configuration

// Includes common webpack configuration settings
// To be filled in later...

Development Webpack Configuration

// Contains webpack settings specific to the development environment
// To be completed soon...

Production Webpack Configuration

// Consists of webpack configurations tailored for production deployment
// More details coming shortly...

tsconfig Setup

// Displaying the tsconfig file contents for reference
// Stay tuned for more information...

I have shared a lot of information above, as I am currently puzzled by these issues and wanted to provide all relevant details. Notably, I do not utilize any import ... from "rxjs/internal", yet it seems to be happening behind the scenes. This behavior is unique to RxJS and has not occurred with any other dependency. I tried installing web-common directly instead of linking it, but unfortunately, that did not resolve the problem.

typescriptnpmwebpackrxjs

Answer №1

I believe there may be an issue in your development build, but it should not cause a failure due to a TypeScript error. This is because you have set transpileOnly: true in the ts-loader configuration for development.

The mismatched types are likely due to having two separate installations of RxJS, each coming from different modules. One potential solution is to physically install web-common into your project before running a production build.

This error is specific to TypeScript, and if the versions of RxJS being used are compatible, the JavaScript code generated should still function properly.

However, webpack might include both versions of RxJS in the bundle - one from web-common and another from A-frontend.

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