allow to disable compareBeforeEmit

declarations/WebpackOptions.d.ts

@@ -1180,6 +1180,10 @@ export interface OutputOptions {
 	 * Number of milliseconds before chunk request expires
 	 */
 	chunkLoadTimeout?: number;
+	/**
+	 * Check if to be emitted file already exists and have the same content before writing to output filesystem
+	 */
+	compareBeforeEmit?: boolean;
 	/**
 	 * This option enables cross-origin loading of chunks.
 	 */

lib/Compiler.js

@@ -581,15 +581,19 @@ class Compiler {
 							}
 						}
 
-						this.outputFileSystem.stat(targetPath, (err, stats) => {
-							const exists = !err && stats.isFile();
+						if (this.options.output.compareBeforeEmit) {
+							this.outputFileSystem.stat(targetPath, (err, stats) => {
+								const exists = !err && stats.isFile();
 
-							if (exists) {
-								processExistingFile(stats);
-							} else {
-								processMissingFile();
-							}
-						});
+								if (exists) {
+									processExistingFile(stats);
+								} else {
+									processMissingFile();
+								}
+							});
+						} else {
+							processMissingFile();
+						}
 					};
 
 					if (targetFile.match(/\/|\\/)) {

lib/WebpackOptionsDefaulter.js

@@ -232,6 +232,7 @@ class WebpackOptionsDefaulter extends OptionsDefaulter {
 		this.set("output.webassemblyModuleFilename", "[hash].module.wasm");
 		this.set("output.library", "");
 		this.set("output.publicPath", "");
+		this.set("output.compareBeforeEmit", true);
 		this.set("output.hotUpdateFunction", "make", options => {
 			return Template.toIdentifier(
 				"webpackHotUpdate" + Template.toIdentifier(options.output.library)

schemas/WebpackOptions.json

@@ -1123,6 +1123,10 @@
           "description": "Number of milliseconds before chunk request expires",
           "type": "number"
         },
+        "compareBeforeEmit": {
+          "description": "Check if to be emitted file already exists and have the same content before writing to output filesystem",
+          "type": "boolean"
+        },
         "crossOriginLoading": {
           "description": "This option enables cross-origin loading of chunks.",
           "enum": [false, "anonymous", "use-credentials"]