chore: Allow passing a typePrefix to ContextElementDependency

This is needed to tell different usages apart. The added information is
used by the lazy compilation feature.

Author: bebraw

lib/ContextModule.js

@@ -54,6 +54,7 @@ const makeSerializable = require("./util/makeSerializable");
  * @property {RegExp=} include
  * @property {RegExp=} exclude
  * @property {RawChunkGroupOptions=} groupOptions
+ * @property {string=} typePrefix
  * @property {string=} category
  * @property {string[][]=} referencedExports exports referenced from modules (won't be mangled)
  */

lib/ContextModuleFactory.js

@@ -273,7 +273,8 @@ module.exports = class ContextModuleFactory extends ModuleFactory {
 			include,
 			exclude,
 			referencedExports,
-			category
+			category,
+			typePrefix
 		} = options;
 		if (!regExp || !resource) return callback(null, []);
 
@@ -346,6 +347,7 @@ module.exports = class ContextModuleFactory extends ModuleFactory {
 													const dep = new ContextElementDependency(
 														obj.request + resourceQuery + resourceFragment,
 														obj.request,
+														typePrefix,
 														category,
 														referencedExports
 													);

lib/dependencies/ContextElementDependency.js

@@ -14,9 +14,10 @@ const ModuleDependency = require("./ModuleDependency");
 /** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */
 
 class ContextElementDependency extends ModuleDependency {
-	constructor(request, userRequest, category, referencedExports) {
+	constructor(request, userRequest, typePrefix, category, referencedExports) {
 		super(request);
 		this.referencedExports = referencedExports;
+		this._typePrefix = typePrefix;
 		this._category = category;
 
 		if (userRequest) {
@@ -25,6 +26,10 @@ class ContextElementDependency extends ModuleDependency {
 	}
 
 	get type() {
+		if (this._typePrefix) {
+			return `${this._typePrefix} context element`;
+		}
+
 		return "context element";
 	}
 

lib/dependencies/ImportParserPlugin.js

@@ -248,6 +248,7 @@ class ImportParserPlugin {
 						namespaceObject: parser.state.module.buildMeta.strictHarmonyModule
 							? "strict"
 							: true,
+						typePrefix: "import()",
 						category: "esm",
 						referencedExports: exports
 					},

lib/hmr/LazyCompilationPlugin.js

@@ -351,6 +351,7 @@ class LazyCompilationPlugin {
 								dep =>
 									IGNORED_DEPENDENCY_TYPES.has(dep.type) ||
 									(this.imports && dep.type === "import()") ||
+									(this.imports && dep.type === "import() context element") ||
 									(this.entries && dep.type === "entry")
 							) &&
 							!/webpack[/\\]hot[/\\]|webpack-dev-server[/\\]client/.test(