Convert mocha tests to jest for all packages (#150)

.changeset/big-feet-beam.md

@@ -0,0 +1,15 @@
+---
+'data-uri-to-buffer': patch
+'https-proxy-agent': patch
+'socks-proxy-agent': patch
+'http-proxy-agent': patch
+'pac-proxy-agent': patch
+'pac-resolver': patch
+'degenerator': patch
+'proxy-agent': patch
+'agent-base': patch
+'get-uri': patch
+'proxy': patch
+---
+
+Convert mocha tests to jest for all packages

packages/agent-base/package.json

@@ -11,8 +11,7 @@
     "build": "tsc",
     "test": "jest --env node --verbose --bail",
     "lint": "eslint . --ext .ts",
-    "pack": "node ../../scripts/pack.mjs",
-    "prepublishOnly": "npm run build"
+    "pack": "node ../../scripts/pack.mjs"
   },
   "repository": {
     "type": "git",

packages/agent-base/src/helpers.ts

@@ -2,6 +2,10 @@ import * as http from 'http';
 import * as https from 'https';
 import type { Readable } from 'stream';
 
+export type ThenableRequest = http.ClientRequest & {
+	then: Promise<http.IncomingMessage>['then'];
+};
+
 export async function toBuffer(stream: Readable): Promise<Buffer> {
 	let length = 0;
 	const chunks: Buffer[] = [];
@@ -28,12 +32,15 @@ export async function json(stream: Readable): Promise<any> {
 export function req(
 	url: string | URL,
 	opts: https.RequestOptions = {}
-): Promise<http.IncomingMessage> {
-	return new Promise((resolve, reject) => {
+): ThenableRequest {
+	let req!: ThenableRequest;
+	const promise = new Promise<http.IncomingMessage>((resolve, reject) => {
 		const href = typeof url === 'string' ? url : url.href;
-		(href.startsWith('https:') ? https : http)
+		req = (href.startsWith('https:') ? https : http)
 			.request(url, opts, resolve)
 			.once('error', reject)
-			.end();
+			.end() as ThenableRequest;
 	});
+	req.then = promise.then.bind(promise);
+	return req;
 }