Steer clear of mentioning unbound methods, as they can lead to accidental scoping errors with 'this' when invoking static methods

I've been working on a method map based on a query from the Stack Overflow post linked here to assist me in dynamically calling a static method. But, I keep encountering this error message:

Avoid referencing unbound methods that could lead to unintentional scoping issues with this

Any ideas on how to resolve this?

  addCourseContentElementMethodMap = {
    [CourseContentElementMethodMap.ADD_COURSE_CONTENT_ELEMENT_AUDIO]:
      CourseContentElementAudioService.addCourseContentElement,
                  
                  // Other mappings go here...
                  
  };

This error persists for each line listed above:

   55:7   error  Avoid referencing unbound methods which may cause unintentional scoping of `this`  @typescript-eslint/unbound-method
   57:7   error  Avoid referencing unbound methods which may cause unintentional scoping of `this`  @typescript-eslint/unbound-method
      
                  // More errors listed here...
      

The problematic methods are defined as follows:

export class CourseContentElementAudioService {
  constructor(private courseContentElementService: CourseContentElementsService) {}
}

Here's an example of one of these methods:

  static addCourseContentElement(
    courseContents: ICourseContent[],
    selectedCourseContentElementUid: string,
    selectedCourseContentUid: string | undefined
  ): ICourseContent[] {
    return CourseContentElementsService.addCourseContentElement(
      courseContents,
      selectedCourseContentUid,
      {
        uid: selectedCourseContentElementUid,
        url: initialState.courseMedia.audio[0].url,
      },
      CourseContentElementType.AUDIO
    );
  }

Answer №1

Here are a few choices for you:

  1. Disable this lint rule for the entire project

  2. Turn off this lint rule for this specific file/block of code

  3. Bind methods to ensure they are no longer unbound

[CourseContentElementMethodMap.ADD_COURSE_CONTENT_ELEMENT_AUDIO]:
 CourseContentElementEditorService.addCourseContentElement.bind(CourseContentElementEditorService)
  1. Use short one-time use arrow wrappers to bind your functions
 [CourseContentElementMethodMap.ADD_COURSE_CONTENT_ELEMENT_AUDIO]:
 (...args) => CourseContentElementEditorService.addCourseContentElement(...args)

Answer №2

Include the following option in the configuration:

     "@typescript-eslint/unbound-method": ["error", {
      "ignoreStatic": true
    }],

Refer to

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