feat(target): support electron preload async chunk loading

declarations/WebpackOptions.d.ts

@@ -390,7 +390,8 @@ export interface WebpackOptions {
 				| "async-node"
 				| "node-webkit"
 				| "electron-main"
-				| "electron-renderer")
+				| "electron-renderer"
+				| "electron-preload")
 		| ((compiler: import("../lib/Compiler")) => void);
 	/**
 	 * Enter watch mode, which rebuilds on file change.

lib/WebpackOptionsApply.js

@@ -156,11 +156,19 @@ class WebpackOptionsApply extends OptionsApply {
 					new LoaderTargetPlugin(options.target).apply(compiler);
 					break;
 				case "electron-renderer":
-					JsonpTemplatePlugin = require("./web/JsonpTemplatePlugin");
+				case "electron-preload":
 					FetchCompileWasmTemplatePlugin = require("./web/FetchCompileWasmTemplatePlugin");
 					NodeTargetPlugin = require("./node/NodeTargetPlugin");
 					ExternalsPlugin = require("./ExternalsPlugin");
-					new JsonpTemplatePlugin().apply(compiler);
+					if (options.target === "electron-renderer") {
+						JsonpTemplatePlugin = require("./web/JsonpTemplatePlugin");
+						new JsonpTemplatePlugin().apply(compiler);
+					} else if (options.target === "electron-preload") {
+						NodeTemplatePlugin = require("./node/NodeTemplatePlugin");
+						new NodeTemplatePlugin({
+							asyncChunkLoading: true
+						}).apply(compiler);
+					}
 					new FetchCompileWasmTemplatePlugin({
 						mangleImports: options.optimization.mangleWasmImports
 					}).apply(compiler);

schemas/WebpackOptions.json

@@ -2128,7 +2128,8 @@
             "async-node",
             "node-webkit",
             "electron-main",
-            "electron-renderer"
+            "electron-renderer",
+            "electron-preload"
           ]
         },
         {