feat: allow returning errors from custom minimize function

README.md

@@ -50,6 +50,7 @@ module.exports = {
       new CssMinimizerPlugin(),
     ],
   },
+  plugins: [new MiniCssExtractPlugin()],
 };
 ```
 
@@ -223,7 +224,7 @@ Possible options:
 - CssMinimizerPlugin.cssnanoMinify
 - CssMinimizerPlugin.cssoMinify
 - CssMinimizerPlugin.cleanCssMinify
-- `async (data, inputMap, minimizerOptions) => {return {code: "a{color: red}", map: "...", warnings: []}}`
+- `async (data, inputMap, minimizerOptions) => {return {code: "a{color: red}", map: "...", warnings: [], errors: []}}`
 
 > ⚠️ **Always use `require` inside `minify` function when `parallel` option enabled**.
 
@@ -278,6 +279,7 @@ module.exports = {
               code: `a{color: red}`,
               map: `{"version": "3", ...}`,
               warnings: [],
+              errors: [],
             };
           },
         ],
@@ -450,6 +452,7 @@ module.exports = {
   optimization: {
     minimizer: [new CssMinimizerPlugin()],
   },
+  plugins: [new MiniCssExtractPlugin()],
 };
 ```
 

src/index.js

@@ -53,67 +53,19 @@ class CssMinimizerPlugin {
     );
   }
 
-  static buildError(error, name, sourceMap, requestShortener) {
-    let builtError;
-
-    if (error.line) {
-      const original =
-        sourceMap &&
-        sourceMap.originalPositionFor({
-          line: error.line,
-          column: error.column,
-        });
-
-      if (original && original.source && requestShortener) {
-        builtError = new Error(
-          `${name} from Css Minimizer Webpack Plugin\n${
-            error.message
-          } [${requestShortener.shorten(original.source)}:${original.line},${
-            original.column
-          }][${name}:${error.line},${error.column}]${
-            error.stack
-              ? `\n${error.stack.split("\n").slice(1).join("\n")}`
-              : ""
-          }`
-        );
-        builtError.file = name;
-
-        return builtError;
-      }
-
-      builtError = new Error(
-        `${name} from Css Minimizer \n${error.message} [${name}:${error.line},${
-          error.column
-        }]${
-          error.stack ? `\n${error.stack.split("\n").slice(1).join("\n")}` : ""
-        }`
-      );
-      builtError.file = name;
-
-      return builtError;
-    }
-
-    if (error.stack) {
-      builtError = new Error(`${name} from Css Minimizer\n${error.stack}`);
-      builtError.file = name;
-
-      return builtError;
-    }
-
-    builtError = new Error(`${name} from Css Minimizer\n${error.message}`);
-    builtError.file = name;
-
-    return builtError;
-  }
-
   static buildWarning(
     warning,
     file,
     sourceMap,
     requestShortener,
     warningsFilter
   ) {
-    let warningMessage = warning;
+    let warningMessage =
+      typeof warning === "string"
+        ? warning
+        : `${warning.plugin ? `[${warning.plugin}] ` : ""}${
+            warning.text || warning.message
+          }`;
     let locationMessage = "";
     let source;
 
@@ -149,7 +101,7 @@ class CssMinimizerPlugin {
     }
 
     const builtWarning = new Error(
-      `Css Minimizer Plugin: ${warningMessage}${
+      `${file} from Css Minimizer Plugin\n${warningMessage}${
         locationMessage ? ` ${locationMessage}` : ""
       }`
     );
@@ -161,6 +113,70 @@ class CssMinimizerPlugin {
     return builtWarning;
   }
 
+  static buildError(error, file, sourceMap, requestShortener) {
+    let builtError;
+
+    if (typeof error === "string") {
+      builtError = new Error(`${file} from Css Minimizer Plugin\n${error}`);
+      builtError.file = file;
+
+      return builtError;
+    }
+
+    if (error.line) {
+      const original =
+        sourceMap &&
+        sourceMap.originalPositionFor({
+          line: error.line,
+          column: error.column,
+        });
+
+      if (original && original.source && requestShortener) {
+        builtError = new Error(
+          `${file} from Css Minimizer Plugin\n${
+            error.message
+          } [${requestShortener.shorten(original.source)}:${original.line},${
+            original.column
+          }][${file}:${error.line},${error.column}]${
+            error.stack
+              ? `\n${error.stack.split("\n").slice(1).join("\n")}`
+              : ""
+          }`
+        );
+        builtError.file = file;
+
+        return builtError;
+      }
+
+      builtError = new Error(
+        `${file} from Css Minimizer Plugin\n${error.message} [${file}:${
+          error.line
+        },${error.column}]${
+          error.stack ? `\n${error.stack.split("\n").slice(1).join("\n")}` : ""
+        }`
+      );
+      builtError.file = file;
+
+      return builtError;
+    }
+
+    if (error.stack) {
+      builtError = new Error(
+        `${file} from Css Minimizer Plugin\n${error.stack}`
+      );
+      builtError.file = file;
+
+      return builtError;
+    }
+
+    builtError = new Error(
+      `${file} from Css Minimizer Plugin\n${error.message}`
+    );
+    builtError.file = file;
+
+    return builtError;
+  }
+
   static getAvailableNumberOfCores(parallel) {
     // In some cases cpus() returns undefined
     // https://github.com/nodejs/node/issues/19022
@@ -350,6 +366,27 @@ class CssMinimizerPlugin {
               }
             }
 
+            if (result.errors && result.errors.length > 0) {
+              const hasSourceMap =
+                inputSourceMap &&
+                CssMinimizerPlugin.isSourceMap(inputSourceMap);
+
+              for (const error of result.errors) {
+                output.warnings.push(
+                  CssMinimizerPlugin.buildError(
+                    error,
+                    name,
+                    hasSourceMap
+                      ? new SourceMapConsumer(inputSourceMap)
+                      : // eslint-disable-next-line no-undefined
+                        undefined,
+                    // eslint-disable-next-line no-undefined
+                    hasSourceMap ? compilation.requestShortener : undefined
+                  )
+                );
+              }
+            }
+
             if (result.warnings && result.warnings.length > 0) {
               const hasSourceMap =
                 inputSourceMap &&

src/minify.js

@@ -32,15 +32,11 @@ const minify = async (options) => {
     }
 
     if (minifyResult.errors) {
-      result.errors = result.errors.concat(
-        minifyResult.errors.map((error) => error.toString())
-      );
+      result.errors = result.errors.concat(minifyResult.errors);
     }
 
     if (minifyResult.warnings) {
-      result.warnings = result.warnings.concat(
-        minifyResult.warnings.map((warning) => warning.toString())
-      );
+      result.warnings = result.warnings.concat(minifyResult.warnings);
     }
 
     result.outputs.push({ code: minifyResult.code, map: minifyResult.map });

test/__snapshots__/CssMinimizerPlugin.test.js.snap

@@ -1,40 +1,55 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`CssMinimizerPlugin buildError method 1`] = `
-[Error: test.css from Css Minimizer
+[Error: test.css from Css Minimizer Plugin
 Message]
 `;
 
 exports[`CssMinimizerPlugin buildError method 2`] = `
-[Error: test.css from Css Minimizer 
+[Error: test.css from Css Minimizer Plugin
 Message [test.css:1,1]]
 `;
 
 exports[`CssMinimizerPlugin buildError method 3`] = `
-[Error: test.css from Css Minimizer Webpack Plugin
+[Error: test.css from Css Minimizer Plugin
 Message [http://example.com/www/js/one.css:1,1][test.css:1,1]]
 `;
 
 exports[`CssMinimizerPlugin buildError method 4`] = `
-[Error: test.css from Css Minimizer
+[Error: test.css from Css Minimizer Plugin
 Stack]
 `;
 
-exports[`CssMinimizerPlugin buildWarning method 1`] = `[Warning: Css Minimizer Plugin: Warning test.css:1:1]`;
+exports[`CssMinimizerPlugin buildWarning method 1`] = `
+[Warning: undefined from Css Minimizer Plugin
+Warning test.css:1:1]
+`;
 
-exports[`CssMinimizerPlugin buildWarning method 2`] = `[Warning: Css Minimizer Plugin: Warning test.css:1:1]`;
+exports[`CssMinimizerPlugin buildWarning method 2`] = `
+[Warning: test.css from Css Minimizer Plugin
+Warning test.css:1:1]
+`;
 
-exports[`CssMinimizerPlugin buildWarning method 3`] = `[Warning: Css Minimizer Plugin: Warning test.css:1:1]`;
+exports[`CssMinimizerPlugin buildWarning method 3`] = `
+[Warning: test.css from Css Minimizer Plugin
+Warning test.css:1:1]
+`;
 
-exports[`CssMinimizerPlugin buildWarning method 4`] = `[Warning: Css Minimizer Plugin: Warning http://example.com/www/js/one.css:1:1]`;
+exports[`CssMinimizerPlugin buildWarning method 4`] = `
+[Warning: test.css from Css Minimizer Plugin
+Warning http://example.com/www/js/one.css:1:1]
+`;
 
-exports[`CssMinimizerPlugin buildWarning method 5`] = `[Warning: Css Minimizer Plugin: Warning http://example.com/www/js/one.css:1:1]`;
+exports[`CssMinimizerPlugin buildWarning method 5`] = `
+[Warning: test.css from Css Minimizer Plugin
+Warning http://example.com/www/js/one.css:1:1]
+`;
 
 exports[`CssMinimizerPlugin buildWarning method 6`] = `null`;
 
 exports[`CssMinimizerPlugin should build error: error 1`] = `
 Array [
-  "Error: error.css from Css Minimizer 
+  "Error: error.css from Css Minimizer Plugin
 /error.css:1:1: Unknown word [error.css:1,1]",
 ]
 `;
@@ -45,7 +60,8 @@ exports[`CssMinimizerPlugin should build warning: error 1`] = `Array []`;
 
 exports[`CssMinimizerPlugin should build warning: warning 1`] = `
 Array [
-  "Warning: Css Minimizer Plugin: warning-plugin:: Warning webpack://./test/foo.css:2:2",
+  "Warning: foo.css from Css Minimizer Plugin
+[warning-plugin] Warning",
 ]
 `;
 
@@ -71,7 +87,7 @@ exports[`CssMinimizerPlugin should run plugin against assets added later by plug
 
 exports[`CssMinimizerPlugin should throw error from postcss: error 1`] = `
 Array [
-  "Error: foo.css from Css Minimizer Webpack Plugin
+  "Error: foo.css from Css Minimizer Plugin
 error-plugin: /foo.css:2:3: Postcss error [webpack://./test/foo.css:2,2][foo.css:2,3]",
 ]
 `;
@@ -297,9 +313,12 @@ a {
 
 exports[`CssMinimizerPlugin should work with warnings and use memory cache when the "cache" option is "true" and the asset has been changed: errors 1`] = `
 Array [
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from foo.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style-2.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style.css",
+  "Warning: foo.css from Css Minimizer Plugin
+[warning-plugin] Warning from foo.css",
+  "Warning: style-2.css from Css Minimizer Plugin
+[warning-plugin] Warning from style-2.css",
+  "Warning: style.css from Css Minimizer Plugin
+[warning-plugin] Warning from style.css",
 ]
 `;
 
@@ -309,9 +328,12 @@ exports[`CssMinimizerPlugin should work with warnings and use memory cache when
 
 exports[`CssMinimizerPlugin should work with warnings and use memory cache when the "cache" option is "true" and the asset has been changed: warnings 2`] = `
 Array [
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from foo.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style-2.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style.css",
+  "Warning: foo.css from Css Minimizer Plugin
+[warning-plugin] Warning from foo.css",
+  "Warning: style-2.css from Css Minimizer Plugin
+[warning-plugin] Warning from style-2.css",
+  "Warning: style.css from Css Minimizer Plugin
+[warning-plugin] Warning from style.css",
 ]
 `;
 
@@ -345,9 +367,12 @@ a {
 
 exports[`CssMinimizerPlugin should work with warnings and use memory cache when the "cache" option is "true": errors 1`] = `
 Array [
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from foo.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style-2.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style.css",
+  "Warning: foo.css from Css Minimizer Plugin
+[warning-plugin] Warning from foo.css",
+  "Warning: style-2.css from Css Minimizer Plugin
+[warning-plugin] Warning from style-2.css",
+  "Warning: style.css from Css Minimizer Plugin
+[warning-plugin] Warning from style.css",
 ]
 `;
 
@@ -357,9 +382,12 @@ exports[`CssMinimizerPlugin should work with warnings and use memory cache when
 
 exports[`CssMinimizerPlugin should work with warnings and use memory cache when the "cache" option is "true": warnings 2`] = `
 Array [
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from foo.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style-2.css",
-  "Warning: Css Minimizer Plugin: warning-plugin: Warning from style.css",
+  "Warning: foo.css from Css Minimizer Plugin
+[warning-plugin] Warning from foo.css",
+  "Warning: style-2.css from Css Minimizer Plugin
+[warning-plugin] Warning from style-2.css",
+  "Warning: style.css from Css Minimizer Plugin
+[warning-plugin] Warning from style.css",
 ]
 `;