feat: emit asset from messages (#443)

webpack-contrib · Aug 17, 2020 · e966ab9 · e966ab9
1 parent 9100905
commit e966ab9
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Showing 3 changed files with 40 additions and 3 deletions.
diff --git a/src/index.js b/src/index.js
@@ -191,9 +191,18 @@ export default async function loader(content, sourceMap, meta = {}) {
     this.emitWarning(new Warning(warning));
   });
 
-  messages.forEach((msg) => {
-    if (msg.type === 'dependency') {
-      this.addDependency(msg.file);
+  messages.forEach((message) => {
+    if (message.type === 'dependency') {
+      this.addDependency(message.file);
+    }
+
+    if (message.type === 'asset' && message.content && message.file) {
+      this.emitFile(
+        message.file,
+        message.content,
+        message.sourceMap,
+        message.info
+      );
     }
   });
 

diff --git a/test/__snapshots__/loader.test.js.snap b/test/__snapshots__/loader.test.js.snap
@@ -16,6 +16,10 @@ SyntaxError
 
 exports[`loader should emit Syntax Error: warnings 1`] = `Array []`;
 
+exports[`loader should emit asset: errors 1`] = `Array []`;
+
+exports[`loader should emit asset: warnings 1`] = `Array []`;
+
 exports[`loader should emit warning: css 1`] = `
 "a { color: black }
 "

diff --git a/test/loader.test.js b/test/loader.test.js
@@ -55,4 +55,28 @@ describe('loader', () => {
     expect(getWarnings(stats)).toMatchSnapshot('warnings');
     expect(getErrors(stats)).toMatchSnapshot('errors');
   });
+
+  it('should emit asset', async () => {
+    const plugin = () => (css, result) => {
+      result.messages.push({
+        type: 'asset',
+        file: 'sprite.svg',
+        content: '<svg>...</svg>',
+        plugin,
+      });
+    };
+
+    const postcssPlugin = postcss.plugin('postcss-assets', plugin);
+
+    const compiler = getCompiler('./css/index.js', {
+      plugins: [postcssPlugin()],
+      config: false,
+    });
+    const stats = await compile(compiler);
+
+    // eslint-disable-next-line no-underscore-dangle
+    expect(stats.compilation.assets['sprite.svg']).toBeDefined();
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+  });
 });