typescript-functional-extensions/dist/esm/api.js

A TypeScript implementation of synchronous and asynchronous Maybe and Result monads

import { ResultAsync } from './resultAsync.js';
/**
 * Wraps a fetch request generated Promise in a ResultAsync,
 * ensuring both connection errors and Http status code errors
 * are converted into failed Results.
 * The JSON response is unwrapped as object type specified by TValue. Use this for JSON responses.
 * @param request A Promise<Response> generated by a fetch() request
 * @param errorHandler Handles connection and Http status code errors. Can be asynchronous to enable evaluation of the Response body.
 * @returns ResultAsync representing the success/failure of the request
 */
export function fetchJsonResponse(request, errorHandler) {
    return ResultAsync.try(request, errorHandler)
        .ensure((resp) => resp.ok, errorHandler)
        .map((resp) => resp.json());
}
/**
 * Wraps a fetch request generated Promise in a ResultAsync,
 * ensuring both connection errors and Http status code errors
 * are converted into failed Results.
 * The raw Response object is returned as the Result success value.
 * @param request A Promise<Response> generated by a fetch() request
 * @param errorHandler Handles connection and Http status code errors. Can be asynchronous to enable evaluation of the Response body.
 * @returns ResultAsync representing the success/failure of the request
 */
export function fetchResponse(request, errorHandler) {
    return ResultAsync.try(request, errorHandler).ensure((resp) => resp.ok, errorHandler);
}