Leverage enumerations as the keys within an object literal

An error keeps popping up at this specific line:

TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'ICourseContent'.   No index signature with a parameter of type 'string' was found on type 'ICourseContent'.

let elementsRemaining = 0;
[
  CourseContentElementType.AUDIO,
  CourseContentElementType.VIDEO,
  CourseContentElementType.IMAGE,
  CourseContentElementType.DOCUMENT,
  CourseContentElementType.CODE,
  CourseContentElementType.QUIZ,
  CourseContentElementType.EMBED,
].forEach((elementType) => {
  if (
    // The issue is here
    courseContents[this.getCourseContentIndex(courseContents, selectedCourseContentUid) - 1][
      elementType as string
    ] != null
  ) {
    elementsRemaining++;
  }
});

The object structure is detailed below:

export interface ICourseContent {
  id: number;
  uid?: string;
  text: ICourseContentElementText;
  button: ICourseContentElementButton[];
  audio?: ICourseContentElementMedia;
  embed?: ICourseContentElementEmbed;
  video?: ICourseContentElementMedia;
  image?: ICourseContentElementImage;
  quiz?: ICourseContentElementQuiz;
  code?: ICourseContentElementCode;
  document?: ICourseContentElementDocuments;
  camera?: ICourseContentElementCamera;
}

This is the enum in use:

export enum CourseContentElementType {
  CARD = 'card',
  TEXT = 'text',
  BUTTON = 'button',
  CODE = 'code',
  DOCUMENT = 'document',
  AUDIO = 'audio',
  VIDEO = 'video',
  IMAGE = 'image',
  QUIZ = 'quiz',
  EMBED = 'embed',
}

How can I set up the index signature for ICourseContent to easily access content by using the enum?

I attempted the following approach:

export interface ICourseContent {
  id: number;
  uid?: string;
  [key: string]: string;
  text: ICourseContentElementText;
  button: ICourseContentElementButton[];
  audio?: ICourseContentElementMedia;
  embed?: ICourseContentElementEmbed;
  video?: ICourseContentElementMedia;
  image?: ICourseContentElementImage;
  quiz?: ICourseContentElementQuiz;
  code?: ICourseContentElementCode;
  document?: ICourseContentElementDocuments;
  camera?: ICourseContentElementCamera;
}

However, it resulted in the following errors:

TS2411: Property 'id' of type 'number' is not assignable to string index type 'string'.

TS2411: Property 'uid' of type 'string | undefined' is not assignable to string index type 'string'.

TS2411: Property 'text' of type 'ICourseContentElementText' is not assignable to string index type 'string'.

TS2411: Property 'button' of type 'ICourseContentElementButton[]' is not assignable to string index type 'string'.

angulartypescript

Answer №1

I implemented this solution and successfully resolved the error:

  static checkCourseContentElementsPresent(
    courseContents: ICourseContent[],
    selectedCourseContentUid: string,
    elementsRequired = 1
  ): boolean {
    let remainingElements = 0;
    [
      CourseContentElementType.AUDIO,
      CourseContentElementType.VIDEO,
      CourseContentElementType.IMAGE,
      CourseContentElementType.DOCUMENT,
      CourseContentElementType.CODE,
      CourseContentElementType.QUIZ,
      CourseContentElementType.EMBED,
    ].forEach((elementType) => {
      if (
        courseContents[this.getCourseContentIndex(courseContents, selectedCourseContentUid) - 1][
          elementType as
            | CourseContentElementType.AUDIO
            | CourseContentElementType.VIDEO
            | CourseContentElementType.IMAGE
            | CourseContentElementType.DOCUMENT
            | CourseContentElementType.CODE
            | CourseContentElementType.QUIZ
            | CourseContentElementType.EMBED
        ] != null
      ) {
        remainingElements++;
      }
    });
    if (
      courseContents[this.getCourseContentIndex(courseContents, selectedCourseContentUid) - 1].text
        .html != null
    ) {
      remainingElements++;
    }
    return remainingElements === elementsRequired;
  }

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