Fix ProfilingPlugin for watch scenarios

lib/debug/ProfilingPlugin.js

@@ -123,9 +123,7 @@ class Profiler {
  * @returns {Trace} The trace object
  */
 const createTrace = (fs, outputPath) => {
-	const trace = new Tracer({
-		noStream: true
-	});
+	const trace = new Tracer();
 	const profiler = new Profiler(inspector);
 	if (/\/|\\/.test(outputPath)) {
 		const dirPath = dirname(fs, outputPath);
@@ -173,6 +171,7 @@ const createTrace = (fs, outputPath) => {
 		counter,
 		profiler,
 		end: callback => {
+			trace.push("]");
 			// Wait until the write stream finishes.
 			fsStream.on("close", () => {
 				callback();
@@ -242,10 +241,10 @@ class ProfilingPlugin {
 				stage: Infinity
 			},
 			(stats, callback) => {
+				if (compiler.watchMode) return callback();
 				tracer.profiler.stopProfiling().then(parsedResults => {
 					if (parsedResults === undefined) {
 						tracer.profiler.destroy();
-						tracer.trace.flush();
 						tracer.end(callback);
 						return;
 					}
@@ -293,7 +292,6 @@ class ProfilingPlugin {
 					});
 
 					tracer.profiler.destroy();
-					tracer.trace.flush();
 					tracer.end(callback);
 				});
 			}

test/WatchTestCases.template.js

@@ -396,7 +396,7 @@ const describeCases = config => {
 																done
 															)
 														) {
-															compiler.close();
+															compiler.close(() => {});
 															return;
 														}
 														compiler.close(done);

test/watchCases/plugins/profiling-plugin/0/index.js

@@ -0,0 +1,3 @@
+it("compiles", function() {
+	expect(WATCH_STEP).toBe("0");
+})

test/watchCases/plugins/profiling-plugin/1/index.js

@@ -0,0 +1,3 @@
+it("should not crash on recompile", function() {
+	expect(WATCH_STEP).toBe("1");
+})

test/watchCases/plugins/profiling-plugin/deprecations.js

@@ -0,0 +1,3 @@
+module.exports = [
+	{ code: /DEP_WEBPACK_COMPILATION_NORMAL_MODULE_LOADER_HOOK/ }
+];

test/watchCases/plugins/profiling-plugin/webpack.config.js

@@ -0,0 +1,6 @@
+var webpack = require("../../../../");
+
+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	plugins: [new webpack.debug.ProfilingPlugin()]
+};