perf: cache compilation.entrypoints (#7059)

perf: cache

packages/rspack/src/Compilation.ts

@@ -40,7 +40,6 @@ import { Stats, StatsAsset, StatsError, StatsModule } from "./Stats";
 import { LogType, Logger } from "./logging/Logger";
 import { StatsFactory } from "./stats/StatsFactory";
 import { StatsPrinter } from "./stats/StatsPrinter";
-import { concatErrorMsgAndStack } from "./util";
 import { type AssetInfo, JsAssetInfo } from "./util/AssetInfo";
 import MergeCaller from "./util/MergeCaller";
 import { createFakeCompilationDependencies } from "./util/fake";
@@ -142,7 +141,8 @@ export type NormalizedStatsOptions = KnownNormalizedStatsOptions &
 
 export class Compilation {
 	#inner: JsCompilation;
-	#cachedAssets: Record<string, Source>;
+	#cachedAssets?: Record<string, Source>;
+	#cachedEntrypoints?: ReadonlyMap<string, Entrypoint>;
 
 	hooks: Readonly<{
 		processAssets: liteTapable.AsyncSeriesHook<Assets>;
@@ -224,7 +224,6 @@ export class Compilation {
 
 	constructor(compiler: Compiler, inner: JsCompilation) {
 		this.#inner = inner;
-		this.#cachedAssets = this.#createCachedAssets();
 		this.#customModules = {};
 
 		const processAssetsHook = new liteTapable.AsyncSeriesHook<Assets>([
@@ -342,19 +341,25 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 	 * Get a map of all assets.
 	 */
 	get assets(): Record<string, Source> {
+		if (!this.#cachedAssets) {
+			this.#cachedAssets = this.#createCachedAssets();
+		}
 		return this.#cachedAssets;
 	}
 
 	/**
 	 * Get a map of all entrypoints.
 	 */
 	get entrypoints(): ReadonlyMap<string, Entrypoint> {
-		return new Map(
-			Object.entries(this.#inner.entrypoints).map(([n, e]) => [
-				n,
-				Entrypoint.__from_binding(e, this.#inner)
-			])
-		);
+		if (!this.#cachedEntrypoints) {
+			this.#cachedEntrypoints = new Map(
+				Object.entries(this.#inner.entrypoints).map(([n, e]) => [
+					n,
+					Entrypoint.__from_binding(e, this.#inner)
+				])
+			);
+		}
+		return this.#cachedEntrypoints;
 	}
 
 	get modules(): ReadonlySet<Module> {