feat: Add support for alias with array of paths (#376)

Author: anchengjian

src/normalizeOptions.js

@@ -90,7 +90,13 @@ function getAliasSubstitute(value, isKeyRegExp) {
   }
 
   if (!isKeyRegExp) {
-    return ([, match]) => `${value}${match}`;
+    return ([, match]) => {
+      // Alias with array of paths
+      if (Array.isArray(value)) {
+        return value.map(v => `${v}${match}`);
+      }
+      return `${value}${match}`;
+    };
   }
 
   const parts = value.split('\\\\');

src/resolvePath.js

@@ -64,6 +64,18 @@ function resolvePathFromAliasConfig(sourcePath, currentFile, opts) {
     return null;
   }
 
+  // Alias with array of paths
+  if (Array.isArray(aliasedSourceFile)) {
+    return aliasedSourceFile
+      .map(asf => {
+        if (isRelativePath(asf)) {
+          return toLocalPath(toPosixPath(mapToRelative(opts.cwd, currentFile, asf)));
+        }
+        return asf;
+      })
+      .find(src => nodeResolvePath(src, path.dirname(currentFile), opts.extensions));
+  }
+
   if (isRelativePath(aliasedSourceFile)) {
     return toLocalPath(toPosixPath(
       mapToRelative(opts.cwd, currentFile, aliasedSourceFile)),

test/index.test.js

@@ -1046,6 +1046,27 @@ describe('module-resolver', () => {
       );
     });
 
+    // fix: https://github.com/tleunen/babel-plugin-module-resolver/issues/261
+    it('Alias with array of paths', () => {
+      testWithImport(
+        'testArr/tools',
+        '../test/tools',
+        {
+          babelrc: false,
+          plugins: [
+            [plugin, {
+              root: './src',
+              alias: {
+                testArr: ['./src', '/test', './test'],
+              },
+              cwd: 'packagejson',
+            }],
+          ],
+          filename: './test/testproject/src/app.js',
+        },
+      );
+    });
+
     describe('unknown filename', () => {
       const unknownFileTransformerOpts = {
         babelrc: false,