test: code

src/index.js

@@ -75,13 +75,21 @@ export default async function loader(content, sourceMap, meta = {}) {
     }
   }
 
+  let plugins;
+
+  try {
+    plugins = [
+      ...getArrayPlugins(loadedConfig.plugins, file),
+      ...getArrayPlugins(options.plugins, file),
+    ];
+  } catch (error) {
+    this.emitError(error);
+  }
+
   const mergedOptions = {
     ...loadedConfig,
     ...options,
-    plugins: [
-      ...getArrayPlugins(loadedConfig.plugins, file),
-      ...getArrayPlugins(options.plugins, file),
-    ],
+    plugins,
   };
 
   const resultPlugins = mergedOptions.plugins;

src/utils.js

@@ -53,31 +53,20 @@ const load = (plugin, options, file) => {
 };
 
 function loadPlugins(pluginEntry, file) {
-  let plugins = [];
+  const plugins = Object.entries(pluginEntry).filter((i) => {
+    const [, options] = i;
 
-  if (Array.isArray(pluginEntry)) {
-    plugins = pluginEntry.filter(Boolean);
-  } else {
-    plugins = Object.entries(pluginEntry).filter((i) => {
-      const [, options] = i;
-
-      return options !== false ? pluginEntry : '';
-    });
-  }
+    return options !== false ? pluginEntry : '';
+  });
 
-  plugins = plugins.map((plugin) => {
+  const loadedPlugins = plugins.map((plugin) => {
     const [pluginName, pluginOptions] = plugin;
 
     return load(pluginName, pluginOptions, file);
   });
 
-  if (plugins.length && plugins.length > 0) {
-    plugins.forEach((plugin, i) => {
-      if (plugin.postcss) {
-        // eslint-disable-next-line no-param-reassign
-        plugin = plugin.postcss;
-      }
-
+  if (loadedPlugins.length && loadedPlugins.length > 0) {
+    loadedPlugins.forEach((plugin, i) => {
       if (plugin.default) {
         // eslint-disable-next-line no-param-reassign
         plugin = plugin.default;
@@ -97,7 +86,7 @@ function loadPlugins(pluginEntry, file) {
     });
   }
 
-  return plugins;
+  return loadedPlugins;
 }
 
 function exec(code, loaderContext) {

test/options/__snapshots__/plugins.test.js.snap

@@ -1,5 +1,16 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`Options Plugins should emit error on load plugin: errors 1`] = `
+Array [
+  "ModuleBuildError: Module build failed (from \`replaced original path\`):
+TypeError: Cannot read property 'postcss' of undefined",
+  "ModuleError: Module Error (from \`replaced original path\`):
+Loading PostCSS Plugin failed: Cannot find module 'postcss-unresolved' from 'src/utils.js'",
+]
+`;
+
+exports[`Options Plugins should emit error on load plugin: warnings 1`] = `Array []`;
+
 exports[`Options Plugins should work Plugins - {Array<Object>} + options: css 1`] = `
 "a {
   border-top-color: blue;

test/options/plugins.test.js

@@ -141,4 +141,16 @@ describe('Options Plugins', () => {
     expect(getWarnings(stats)).toMatchSnapshot('warnings');
     expect(getErrors(stats)).toMatchSnapshot('errors');
   });
+
+  it('should emit error on load plugin', async () => {
+    const compiler = getCompiler('./css/index2.js', {
+      plugins: {
+        'postcss-unresolved': {},
+      },
+    });
+    const stats = await compile(compiler);
+
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats, true)).toMatchSnapshot('errors');
+  });
 });