delay rewriting chunks

sokra · sokra · commit bb5eb9384229 · 2017-11-24T18:14:27.000+01:00
diff --git a/lib/Module.js b/lib/Module.js
@@ -87,10 +87,14 @@ class Module extends DependenciesBlock {
 		this.usedExports = null;
 		this.providedExports = null;
 		this.optimizationBailout = [];
+
+		// delayed operations
+		this._rewriteChunkInReasons = undefined;
 	}
 
 	disconnect() {
 		this.reasons.length = 0;
+		this._rewriteChunkInReasons = undefined;
 		this._chunks.clear();
 
 		this.id = null;
@@ -196,6 +200,11 @@ class Module extends DependenciesBlock {
 	}
 
 	hasReasonForChunk(chunk) {
+		if(this._rewriteChunkInReasons) {
+			for(const operation of this._rewriteChunkInReasons)
+				this._doRewriteChunkInReasons(operation.oldChunk, operation.newChunks);
+			this._rewriteChunkInReasons = undefined;
+		}
 		for(let i = 0; i < this.reasons.length; i++) {
 			if(this.reasons[i].hasChunk(chunk))
 				return true;
@@ -208,6 +217,16 @@ class Module extends DependenciesBlock {
 	}
 
 	rewriteChunkInReasons(oldChunk, newChunks) {
+		// This is expensive. Delay operation until we really need the data
+		if(this._rewriteChunkInReasons === undefined)
+			this._rewriteChunkInReasons = [];
+		this._rewriteChunkInReasons.push({
+			oldChunk,
+			newChunks
+		});
+	}
+
+	_doRewriteChunkInReasons(oldChunk, newChunks) {
 		for(let i = 0; i < this.reasons.length; i++) {
 			this.reasons[i].rewriteChunks(oldChunk, newChunks);
 		}
