fix: stats.hasWarnings() respects ignoreWarnings

lib/Stats.js

@@ -35,7 +35,7 @@ class Stats {
 	 */
 	hasWarnings() {
 		return (
-			this.compilation.warnings.length > 0 ||
+			this.compilation.getWarnings().length > 0 ||
 			this.compilation.children.some(child => child.getStats().hasWarnings())
 		);
 	}

test/Stats.test.js

@@ -62,6 +62,22 @@ describe("Stats", () => {
 			})
 		).toEqual({});
 	});
+	it("should the results of hasWarnings() be affected by ignoreWarnings", async () => {
+		const stats = await compile({
+			mode: "development",
+			context: __dirname,
+			entry: "./fixtures/ignoreWarnings/index",
+			module: {
+				rules: [
+					{
+						loader: "./fixtures/ignoreWarnings/loader"
+					}
+				]
+			},
+			ignoreWarnings: [/__mocked__warning__/]
+		});
+		expect(stats.hasWarnings()).toBeFalsy();
+	});
 	describe("chunkGroups", () => {
 		it("should be empty when there is no additional chunks", async () => {
 			const stats = await compile({

test/fixtures/ignoreWarnings/index.js

@@ -0,0 +1,3 @@
+module.exports = function ignoreWarnings() {
+	return "This is ignoreWarnings";
+};

test/fixtures/ignoreWarnings/loader.js

@@ -0,0 +1,4 @@
+module.exports = function wraningLoader(content) {
+    this.emitWarning('__mocked__warning__');
+	return content;
+};