Merge pull request #8639 from webpack/memory/limit-parallelism

Change forEach to forEachLimit when emitting assets

declarations.d.ts

@@ -77,6 +77,13 @@ declare module "neo-async" {
 		callback?: ErrorCallback<E>
 	): void;
 
+	export function eachLimit<T, E>(
+		arr: IterableCollection<T>,
+		limit: number,
+		iterator: AsyncIterator<T, E>,
+		callback?: ErrorCallback<E>
+	): void;
+
 	export function map<T, R, E>(
 		arr: T[] | IterableIterator<T>,
 		iterator: AsyncResultIterator<T, R, E>,
@@ -98,6 +105,7 @@ declare module "neo-async" {
 	): void;
 
 	export const forEach: typeof each;
+	export const forEachLimit: typeof eachLimit;
 }
 
 // There are no typings for @webassemblyjs/ast

lib/Compiler.js

@@ -312,8 +312,9 @@ class Compiler extends Tapable {
 		const emitFiles = err => {
 			if (err) return callback(err);
 
-			asyncLib.forEach(
+			asyncLib.forEachLimit(
 				compilation.assets,
+				15,
 				(source, file, callback) => {
 					let targetFile = file;
 					const queryStringIdx = targetFile.indexOf("?");