Need Help with Bulk Refactoring of Deprecated .subscribe() in Angular 18 with RxJS 7.8.1 Hi RxJS Community

[yugandher2000]

I'm struggling with .subscribe() deprecation warnings across a large Angular 18 project using RxJS 7.8.1. Our codebase has thousands of instances of the old .subscribe() style:

this.usersService.getUserList(this.attributeTypeList).subscribe(
  data => {
    // Handle success
  },
  error => {
    // Handle error
  }
);

I want to migrate to the new object-style .subscribe():

this.usersService.getUserList(this.attributeTypeList).subscribe({
  next: (data) => {
    // Handle success
  },
  error: (error) => {
    // Handle error
  },
  complete: () => {
    // Handle completion
  }
});

Manual refactoring isn't practical since it is used in thousands of functions. I've tried a few approaches, but nothing has worked so far:

TS-Morph: I attempted to write a custom script using TS-Morph for automated refactoring, but I faced errors like "Property 'getExpression' does not exist on type 'Node'" and "Unknown file extension '.ts'".
ESLint: I enabled eslint-plugin-rxjs and tried using "rxjs/no-deprecated" to catch these cases, but it didn't detect the .subscribe() deprecations.
Codemods: I searched for codemods or CLI-based tools to handle the refactor, but I didn't find a working solution.

What I'm Looking For:

• Are there reliable tools or scripts that can help me automate the refactor?
• Is there a way to configure ESLint or a codemod to detect and refactor deprecated .subscribe() patterns?
• Any best practices for handling and validating large-scale code changes like this?
• I’d be extremely grateful for any advice or resources you can share.

Environment Details:

Angular 18
RxJS 7.8.1
TypeScript 5.x

[jakovljevic-mladen]

Did you try prefer-observer fix from eslint-plugin-rxjs?