1 files changed, 88 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/optimize/EnsureChunkConditionsPlugin.js b/node_modules/webpack/lib/optimize/EnsureChunkConditionsPlugin.js
new file mode 100644
index 00000000..8a32cc25
--- /dev/null
+++ b/node_modules/webpack/lib/optimize/EnsureChunkConditionsPlugin.js
@@ -0,0 +1,88 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const { STAGE_BASIC } = require("../OptimizationStages");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGroup")} ChunkGroup */
+/** @typedef {import("../Compiler")} Compiler */
+
+class EnsureChunkConditionsPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			"EnsureChunkConditionsPlugin",
+			compilation => {
+				/**
+				 * @param {Iterable<Chunk>} chunks the chunks
+				 */
+				const handler = chunks => {
+					const chunkGraph = compilation.chunkGraph;
+					// These sets are hoisted here to save memory
+					// They are cleared at the end of every loop
+					/** @type {Set<Chunk>} */
+					const sourceChunks = new Set();
+					/** @type {Set<ChunkGroup>} */
+					const chunkGroups = new Set();
+					for (const module of compilation.modules) {
+						if (!module.hasChunkCondition()) continue;
+						for (const chunk of chunkGraph.getModuleChunksIterable(module)) {
+							if (!module.chunkCondition(chunk, compilation)) {
+								sourceChunks.add(chunk);
+								for (const group of chunk.groupsIterable) {
+									chunkGroups.add(group);
+								}
+							}
+						}
+						if (sourceChunks.size === 0) continue;
+						/** @type {Set<Chunk>} */
+						const targetChunks = new Set();
+						chunkGroupLoop: for (const chunkGroup of chunkGroups) {
+							// Can module be placed in a chunk of this group?
+							for (const chunk of chunkGroup.chunks) {
+								if (module.chunkCondition(chunk, compilation)) {
+									targetChunks.add(chunk);
+									continue chunkGroupLoop;
+								}
+							}
+							// We reached the entrypoint: fail
+							if (chunkGroup.isInitial()) {
+								throw new Error(
+									"Cannot fullfil chunk condition of " + module.identifier()
+								);
+							}
+							// Try placing in all parents
+							for (const group of chunkGroup.parentsIterable) {
+								chunkGroups.add(group);
+							}
+						}
+						for (const sourceChunk of sourceChunks) {
+							chunkGraph.disconnectChunkAndModule(sourceChunk, module);
+						}
+						for (const targetChunk of targetChunks) {
+							chunkGraph.connectChunkAndModule(targetChunk, module);
+						}
+						sourceChunks.clear();
+						chunkGroups.clear();
+					}
+				};
+				compilation.hooks.optimizeChunks.tap(
+					{
+						name: "EnsureChunkConditionsPlugin",
+						stage: STAGE_BASIC
+					},
+					handler
+				);
+			}
+		);
+	}
+}
+module.exports = EnsureChunkConditionsPlugin;