style: Fix type-linter warnings

Dependency "node-fetch" has been hoisted and therefore now takes
presendence over the "@types/node-fetch" dependency referenced by
make-fetch-happen. The new types exposed through that are not compatible
with make-fetch-happen and therefore required some adjustments.

Also see DefinitelyTyped/DefinitelyTyped#59314 (comment)

Author: RandomByte

scripts/docs/downloadHelper.ts

@@ -6,7 +6,7 @@ import {pipeline} from "node:stream/promises";
 
 export async function downloadFile(url: string, targetDir: string) {
 	const response = await fetch(url);
-	if (!response.ok) {
+	if (!response.ok || !response.body) {
 		if (response.status === 404) {
 			throw new Error(`The requested version does not exist`);
 		} else {

src/tools/create_ui5_app/ODataMetadata.ts

@@ -114,7 +114,7 @@ export default class ODataMetadata {
 		try {
 			this.serviceUrl = new URL(serviceUrl);
 			const url = `${this.serviceUrl.toString()}$metadata`;
-			const response = await fetch(url, {signal: AbortSignal.timeout(10000)} as fetch.FetchOptions);
+			const response = await fetch(url, {signal: AbortSignal.timeout(10000)} as unknown as fetch.FetchOptions);
 			if (!response.ok) {
 				if (response.status === 404) {
 					log.info(`The requested resource does not exist: ${url}`);

src/tools/get_api_reference/lib/apiReferenceResources.ts

@@ -143,7 +143,7 @@ export async function _createApiIndex(targetDir: string, apiJsonPaths: string[])
 export async function _fetchApiJson(targetPath: string, url: string) {
 	const response = await fetchCdnRaw(url);
 	await pipeline(
-		response.body,
+		response.body!,
 		createWriteStream(targetPath)
 	);
 	return targetPath;

src/utils/cdnHelper.ts

@@ -32,7 +32,7 @@ export async function fetchCdnRaw(url: string) {
 	try {
 		const response = await fetch(url);
 
-		if (!response.ok) {
+		if (!response.ok || !response.body) {
 			if (response.status === 404) {
 				throw new Error(`The requested resource does not exist`);
 			} else {
@@ -53,5 +53,5 @@ export async function fetchCdnRaw(url: string) {
 
 export async function fetchCdn(url: string): Promise<object> {
 	const res = await fetchCdnRaw(url);
-	return await res.json() as unknown as object;
+	return await res.json() as object;
 }