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@returns

Tag type: block tag

TSDoc standardization: core

The @returns tag is used to document the return type of a function or method parameter. Being a block tag, @returns introduces a TSDoc section that contains all comment text up until the next block tag.

NOTE: JSDoc’s version of the @returns tag optionally allows type information to be specified in curly braces. For example:

// NOT SUPPORTED BY API EXTRACTOR

/**
 * Returns the sum of a and b
 * @param {number} a
 * @param {number} b
 * @param {boolean} retArr If set to true, the function will return an array
 * @returns {(number|Array)} Sum of a and b or an array
 */
function sum(a, b, retArr) {
 if (retArr) {
   return [a, b, a + b];
 }
 return a + b;
}

API Extractor does not support this {(number|Array)} notation, since its grammar is complex, and the type system it implements is fairly rudimentary compared to TypeScript’s. For TypeScript source code, the return type information is already fully expressed in the code, and thus it would be redundant to try to express it in a doc comment.

Usage example:

/** @public */
export class Statistics {
  /**
   * Returns the average of two numbers.
   *
   * @remarks
   * This method is part of the {@link core-library#Statistics | Statistics subsystem}.
   *
   * @param x - The first input number
   * @param y - The second input number
   * @returns The arithmetic mean of `x` and `y`
   */
  public static getAverage(x: number, y: number): number {
    return (x + y) / 2.0;
  }
}

See also