Fix Chrome 105 compatibility (#451)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Author: karol-f

source/core/Ky.ts

@@ -155,6 +155,11 @@ export class Ky {
 
 		this.request = new globalThis.Request(this._input as RequestInfo, this._options as RequestInit);
 
+		if (supportsStreams) {
+			// @ts-expect-error - Types are outdated.
+			this.request.duplex = 'half';
+		}
+
 		if (this._options.searchParams) {
 			// eslint-disable-next-line unicorn/prevent-abbreviations
 			const textSearchParams = typeof this._options.searchParams === 'string'

source/core/constants.ts

@@ -1,8 +1,27 @@
 import type {Expect, Equal} from '@type-challenges/utils';
 import {HttpMethod} from '../types/options.js';
 
+export const supportsStreams = (() => {
+	let duplexAccessed = false;
+	let hasContentType = false;
+	const supportsReadableStream = typeof globalThis.ReadableStream === 'function';
+
+	if (supportsReadableStream) {
+		hasContentType = new globalThis.Request('', {
+			body: new globalThis.ReadableStream(),
+			method: 'POST',
+			// @ts-expect-error - Types are outdated.
+			get duplex() {
+				duplexAccessed = true;
+				return 'half';
+			},
+		}).headers.has('Content-Type');
+	}
+
+	return duplexAccessed && !hasContentType;
+})();
+
 export const supportsAbortController = typeof globalThis.AbortController === 'function';
-export const supportsStreams = typeof globalThis.ReadableStream === 'function';
 export const supportsFormData = typeof globalThis.FormData === 'function';
 
 export const requestMethods = ['get', 'post', 'put', 'patch', 'head', 'delete'] as const;