upstream-gitea/web_src/js/modules/fetch.ts

import {isObject} from '../utils.ts';
import type {RequestOpts} from '../types.ts';

// fetch wrapper, use below method name functions and the `data` option to pass in data
// which will automatically set an appropriate headers. For JSON content, only object
// and array types are currently supported.
export function request(url: string, {method = 'GET', data, headers = {}, ...other}: RequestOpts = {}): Promise<Response> {
  let body: string | FormData | URLSearchParams | undefined;
  let contentType: string | undefined;
  if (data instanceof FormData || data instanceof URLSearchParams) {
    body = data;
  } else if (isObject(data) || Array.isArray(data)) {
    contentType = 'application/json';
    body = JSON.stringify(data);
  }

  headers = new Headers(headers);
  if (!headers.has('content-type') && contentType) {
    headers.set('content-type', contentType);
  }
  return fetch(url, { // eslint-disable-line no-restricted-globals -- this is the wrapper the rule points to
    method,
    headers,
    ...other,
    ...(body && {body}),
  });
}

export const GET = (url: string, opts?: RequestOpts) => request(url, {method: 'GET', ...opts});
export const POST = (url: string, opts?: RequestOpts) => request(url, {method: 'POST', ...opts});
export const PATCH = (url: string, opts?: RequestOpts) => request(url, {method: 'PATCH', ...opts});
export const PUT = (url: string, opts?: RequestOpts) => request(url, {method: 'PUT', ...opts});
export const DELETE = (url: string, opts?: RequestOpts) => request(url, {method: 'DELETE', ...opts});