fix: should provide full error message with error name when hideStack is set to true

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-error/index.js

@@ -0,0 +1,10 @@
+it("should include loader thrown error", () => {
+  let errored = false;
+	try {
+		require("./lib");
+	} catch (e) {
+    errored = true;
+		expect(e.message).toContain("Failed to load");
+	}
+  expect(errored).toBeTruthy()
+});

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-error/lib.js

@@ -0,0 +1 @@
+export const lib = "lib";

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-error/my-loader.js

@@ -0,0 +1,4 @@
+module.exports = function (context) {
+  this.emitError(new Error("Failed to load"));
+	return ""
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-error/rspack.config.js

@@ -0,0 +1,18 @@
+/**
+ * @type {import('@rspack/core').RspackOptions}
+ */
+module.exports = {
+	context: __dirname,
+	module: {
+		rules: [
+			{
+				test: /lib\.js$/,
+				use: [
+					{
+						loader: "./my-loader.js"
+					}
+				]
+			}
+		]
+	}
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-error/stats.err

@@ -0,0 +1,9 @@
+ERROR in ./lib.js
+  × ModuleError: Failed to load (from: <PROJECT_ROOT>/tests/diagnosticsCases/module-build-failed/loader-emit-error/my-loader.js)
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/index.js

@@ -0,0 +1,10 @@
+it("should include loader thrown error", () => {
+  let errored = false;
+	try {
+		require("./lib");
+	} catch (e) {
+    errored = true;
+		expect(e.message).toContain("Failed to load");
+	}
+  expect(errored).toBeTruthy()
+});

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/lib.js

@@ -0,0 +1 @@
+export const lib = "lib";

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/my-loader.js

@@ -0,0 +1,11 @@
+module.exports = function (context) {
+	let e;
+	e = new Error("Failed to load");
+	e.hideStack = true;
+  this.emitError(e);
+
+	e = new Error("Failed to load");
+	e.hideStack = true;
+	this.emitWarning(e);
+	return ""
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/rspack.config.js

@@ -0,0 +1,18 @@
+/**
+ * @type {import('@rspack/core').RspackOptions}
+ */
+module.exports = {
+	context: __dirname,
+	module: {
+		rules: [
+			{
+				test: /lib\.js$/,
+				use: [
+					{
+						loader: "./my-loader.js"
+					}
+				]
+			}
+		]
+	}
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/stats.err

@@ -0,0 +1,5 @@
+WARNING in ./lib.js
+  ⚠ ModuleWarning: Failed to load (from: <PROJECT_ROOT>/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/my-loader.js)
+
+ERROR in ./lib.js
+  × ModuleError: Failed to load (from: <PROJECT_ROOT>/tests/diagnosticsCases/module-build-failed/loader-emit-hide-stack/my-loader.js)

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-warning/index.js

@@ -0,0 +1,10 @@
+it("should include loader thrown error", () => {
+  let errored = false;
+	try {
+		require("./lib");
+	} catch (e) {
+    errored = true;
+		expect(e.message).toContain("Failed to load");
+	}
+  expect(errored).toBeTruthy()
+});

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-warning/lib.js

@@ -0,0 +1 @@
+export const lib = "lib";

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-warning/my-loader.js

@@ -0,0 +1,4 @@
+module.exports = function (context) {
+  this.emitWarning(new Error("Failed to load"));
+	return ""
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-warning/rspack.config.js

@@ -0,0 +1,18 @@
+/**
+ * @type {import('@rspack/core').RspackOptions}
+ */
+module.exports = {
+	context: __dirname,
+	module: {
+		rules: [
+			{
+				test: /lib\.js$/,
+				use: [
+					{
+						loader: "./my-loader.js"
+					}
+				]
+			}
+		]
+	}
+};

packages/rspack-test-tools/tests/diagnosticsCases/module-build-failed/loader-emit-warning/stats.err

@@ -0,0 +1,9 @@
+WARNING in ./lib.js
+  ⚠ ModuleWarning: Failed to load (from: <PROJECT_ROOT>/tests/diagnosticsCases/module-build-failed/loader-emit-warning/my-loader.js)
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx
+  │     at xxx

packages/rspack/src/loader-runner/index.ts

@@ -618,12 +618,10 @@ export async function runLoaders(
 		if (!(error instanceof Error)) {
 			error = new NonErrorEmittedError(error);
 		}
-		const hasStack = !!error.stack;
 		error.name = "ModuleError";
 		error.message = `${error.message} (from: ${stringifyLoaderObject(
 			loaderContext.loaders[loaderContext.loaderIndex]
 		)})`;
-		!hasStack && Error.captureStackTrace(error);
 		error = concatErrorMsgAndStack(error);
 		(error as RspackError).moduleIdentifier = this._module.identifier();
 		compiler._lastCompilation!.__internal__pushDiagnostic({
@@ -636,12 +634,10 @@ export async function runLoaders(
 		if (!(warning instanceof Error)) {
 			warning = new NonErrorEmittedError(warning);
 		}
-		const hasStack = !!warning.stack;
 		warning.name = "ModuleWarning";
 		warning.message = `${warning.message} (from: ${stringifyLoaderObject(
 			loaderContext.loaders[loaderContext.loaderIndex]
 		)})`;
-		hasStack && Error.captureStackTrace(warning);
 		warning = concatErrorMsgAndStack(warning);
 		(warning as RspackError).moduleIdentifier = this._module.identifier();
 		compiler._lastCompilation!.__internal__pushDiagnostic({

packages/rspack/src/util/index.ts

@@ -77,7 +77,17 @@ export function concatErrorMsgAndStack(
 	}
 	const hideStack = "hideStack" in err && err.hideStack;
 	if (!hideStack && "stack" in err) {
-		err.message = err.stack || err.message;
+		// This is intended to be different than webpack,
+		// here we want to treat the almost the same as `Error.stack` just without the stack.
+		// Webpack uses `Error.message`, however it does not contain the `Error.prototype.name`
+		// `xxx` -> `Error: xxx`. So they behave the same even if `hideStack` is set to `true`.
+		err.message = err.stack || err.toString();
+	} else {
+		// This is intended to be different than webpack,
+		// here we want to treat the almost the same as `Error.stack` just without the stack.
+		// Webpack uses `Error.message`, however it does not contain the `Error.prototype.name`
+		// `xxx` -> `Error: xxx`. So they behave the same even if `hideStack` is set to `true`.
+		err.message = err.toString();
 	}
 	// maybe `null`, use `undefined` to compatible with `Option<String>`
 	err.stack = err.stack || undefined;

tests/plugin-test/css-extract/cases/build-in-css-support/warnings.js

@@ -4,7 +4,7 @@
 // decide bailout on builtin css module
 
 module.exports = `WARNING in ./style.css
-  ⚠ use type 'css' and \`CssExtractRspackPlugin\` together, please set \`experiments.css\` to \`false\` or set \`{ type: "javascript/auto" }\` for rules with \`CssExtractRspackPlugin\` in your rspack config (now \`CssExtractRspackPlugin\` does nothing). 
+  ⚠ ModuleWarning: use type 'css' and \`CssExtractRspackPlugin\` together, please set \`experiments.css\` to \`false\` or set \`{ type: "javascript/auto" }\` for rules with \`CssExtractRspackPlugin\` in your rspack config (now \`CssExtractRspackPlugin\` does nothing). 
 
 WARNING in ./style.css
   ⚠ ModuleWarning: You can't use \`experiments.css\` (\`experiments.futureDefaults\` enable built-in CSS support by default) and \`css-loader\` together, please set \`experiments.css\` to \`false\` or set \`{ type: "javascript/auto" }\` for rules with \`css-loader\` in your webpack config (now css-loader does nothing). `;