fix: respect errors and warnings without code

src/index.js

@@ -559,8 +559,6 @@ class TerserPlugin {
                 `${name} from Terser plugin\nMinimizer doesn't return result`,
               ),
             );
-
-            return;
           }
 
           if (output.warnings && output.warnings.length > 0) {
@@ -598,99 +596,104 @@ class TerserPlugin {
             );
           }
 
-          let shebang;
-
-          if (
-            /** @type {ExtractCommentsObject} */
-            (this.options.extractComments).banner !== false &&
-            output.extractedComments &&
-            output.extractedComments.length > 0 &&
-            output.code.startsWith("#!")
-          ) {
-            const firstNewlinePosition = output.code.indexOf("\n");
-
-            shebang = output.code.slice(0, Math.max(0, firstNewlinePosition));
-            output.code = output.code.slice(
-              Math.max(0, firstNewlinePosition + 1),
-            );
-          }
+          if (output.code) {
+            let shebang;
 
-          if (output.map) {
-            output.source = new SourceMapSource(
-              output.code,
-              name,
-              output.map,
-              input,
-              /** @type {RawSourceMap} */
-              (inputSourceMap),
-              true,
-            );
-          } else {
-            output.source = new RawSource(output.code);
-          }
-
-          if (output.extractedComments && output.extractedComments.length > 0) {
-            const commentsFilename =
+            if (
               /** @type {ExtractCommentsObject} */
-              (this.options.extractComments).filename ||
-              "[file].LICENSE.txt[query]";
-
-            let query = "";
-            let filename = name;
-
-            const querySplit = filename.indexOf("?");
+              (this.options.extractComments).banner !== false &&
+              output.extractedComments &&
+              output.extractedComments.length > 0 &&
+              output.code.startsWith("#!")
+            ) {
+              const firstNewlinePosition = output.code.indexOf("\n");
 
-            if (querySplit >= 0) {
-              query = filename.slice(querySplit);
-              filename = filename.slice(0, querySplit);
+              shebang = output.code.slice(0, Math.max(0, firstNewlinePosition));
+              output.code = output.code.slice(
+                Math.max(0, firstNewlinePosition + 1),
+              );
             }
 
-            const lastSlashIndex = filename.lastIndexOf("/");
-            const basename =
-              lastSlashIndex === -1
-                ? filename
-                : filename.slice(lastSlashIndex + 1);
-            const data = { filename, basename, query };
-
-            output.commentsFilename = compilation.getPath(
-              commentsFilename,
-              data,
-            );
-
-            let banner;
+            if (output.map) {
+              output.source = new SourceMapSource(
+                output.code,
+                name,
+                output.map,
+                input,
+                /** @type {RawSourceMap} */
+                (inputSourceMap),
+                true,
+              );
+            } else {
+              output.source = new RawSource(output.code);
+            }
 
-            // Add a banner to the original file
             if (
-              /** @type {ExtractCommentsObject} */
-              (this.options.extractComments).banner !== false
+              output.extractedComments &&
+              output.extractedComments.length > 0
             ) {
-              banner =
+              const commentsFilename =
                 /** @type {ExtractCommentsObject} */
-                (this.options.extractComments).banner ||
-                `For license information please see ${path
-                  .relative(path.dirname(name), output.commentsFilename)
-                  .replace(/\\/g, "/")}`;
+                (this.options.extractComments).filename ||
+                "[file].LICENSE.txt[query]";
 
-              if (typeof banner === "function") {
-                banner = banner(output.commentsFilename);
+              let query = "";
+              let filename = name;
+
+              const querySplit = filename.indexOf("?");
+
+              if (querySplit >= 0) {
+                query = filename.slice(querySplit);
+                filename = filename.slice(0, querySplit);
               }
 
-              if (banner) {
-                output.source = new ConcatSource(
-                  shebang ? `${shebang}\n` : "",
-                  `/*! ${banner} */\n`,
-                  output.source,
-                );
+              const lastSlashIndex = filename.lastIndexOf("/");
+              const basename =
+                lastSlashIndex === -1
+                  ? filename
+                  : filename.slice(lastSlashIndex + 1);
+              const data = { filename, basename, query };
+
+              output.commentsFilename = compilation.getPath(
+                commentsFilename,
+                data,
+              );
+
+              let banner;
+
+              // Add a banner to the original file
+              if (
+                /** @type {ExtractCommentsObject} */
+                (this.options.extractComments).banner !== false
+              ) {
+                banner =
+                  /** @type {ExtractCommentsObject} */
+                  (this.options.extractComments).banner ||
+                  `For license information please see ${path
+                    .relative(path.dirname(name), output.commentsFilename)
+                    .replace(/\\/g, "/")}`;
+
+                if (typeof banner === "function") {
+                  banner = banner(output.commentsFilename);
+                }
+
+                if (banner) {
+                  output.source = new ConcatSource(
+                    shebang ? `${shebang}\n` : "",
+                    `/*! ${banner} */\n`,
+                    output.source,
+                  );
+                }
               }
-            }
 
-            const extractedCommentsString = output.extractedComments
-              .sort()
-              .join("\n\n");
+              const extractedCommentsString = output.extractedComments
+                .sort()
+                .join("\n\n");
 
-            output.extractedCommentsSource = new RawSource(
-              `${extractedCommentsString}\n`,
-            );
+              output.extractedCommentsSource = new RawSource(
+                `${extractedCommentsString}\n`,
+              );
+            }
           }
 
           await cacheItem.storePromise({
@@ -714,6 +717,10 @@ class TerserPlugin {
           }
         }
 
+        if (!output.source) {
+          return;
+        }
+
         /** @type {AssetInfo} */
         const newInfo = { minimized: true };
         const { source, extractedCommentsSource } = output;

src/utils.js

@@ -523,7 +523,6 @@ async function uglifyJsMinify(
 
   return {
     code: result.code,
-
     map: result.map ? JSON.parse(result.map) : undefined,
     errors: result.error ? [result.error] : [],
     warnings: result.warnings || [],

test/__snapshots__/TerserPlugin.test.js.snap

@@ -3377,8 +3377,14 @@ exports[`TerserPlugin should work, extract comments in one file and use memory c
 
 exports[`TerserPlugin should write stdout and stderr of workers to stdout and stderr of main process in not parallel mode: assets 1`] = `
 Object {
-  "one.js": "",
-  "two.js": "",
+  "one.js": "/******/ (() => { // webpackBootstrap
+
+/******/ })()
+;",
+  "two.js": "/******/ (() => { // webpackBootstrap
+
+/******/ })()
+;",
 }
 `;
 
@@ -3400,8 +3406,14 @@ exports[`TerserPlugin should write stdout and stderr of workers to stdout and st
 
 exports[`TerserPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: assets 1`] = `
 Object {
-  "one.js": "",
-  "two.js": "",
+  "one.js": "/******/ (() => { // webpackBootstrap
+
+/******/ })()
+;",
+  "two.js": "/******/ (() => { // webpackBootstrap
+
+/******/ })()
+;",
 }
 `;
 

test/__snapshots__/minify-option.test.js.snap

@@ -1,5 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`minify option should output errors and warning: errors 1`] = `
+Array [
+  "Error: main.js from Terser plugin
+Minimizer doesn't return result",
+  "Error: main.js from Terser plugin
+error",
+]
+`;
+
+exports[`minify option should output errors and warning: warnings 1`] = `
+Array [
+  "Warning: warning",
+]
+`;
+
 exports[`minify option should snapshot with extracting comments: assets 1`] = `
 Object {
   "main.js": "/*! For license information please see main.js.LICENSE.txt */
@@ -400,6 +415,8 @@ exports[`minify option should work using when the \`minify\` option is \`uglifyJ
 Array [
   "Error: broken.js from Terser plugin
 Minimizer doesn't return result",
+  "Error: broken.js from Terser plugin
+Unterminated template literal [broken.js:1,undefined]",
 ]
 `;
 

test/minify-option.test.js

@@ -157,6 +157,22 @@ describe("minify option", () => {
     expect(getWarnings(stats)).toMatchSnapshot("warnings");
   });
 
+  it("should output errors and warning", async () => {
+    const compiler = getCompiler();
+
+    new TerserPlugin({
+      minify: () => ({
+        errors: ["error"],
+        warnings: ["warning"],
+      }),
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(getErrors(stats)).toMatchSnapshot("errors");
+    expect(getWarnings(stats)).toMatchSnapshot("warnings");
+  });
+
   it("should snapshot with extracting comments", async () => {
     const compiler = getCompiler({
       entry: path.resolve(__dirname, "./fixtures/minify/es5.js"),