fix: add resolution step if alias is wildcard at root. Closes #330

src/transform.ts

@@ -2,7 +2,7 @@ import { dirname, isAbsolute, relative, resolve } from 'node:path'
 
 import MagicString from 'magic-string'
 import ts from 'typescript'
-import { isRegExp, normalizePath } from './utils'
+import { importResolves, isAliasGlobal, isRegExp, normalizePath } from './utils'
 
 import type { Alias } from 'vite'
 
@@ -71,9 +71,13 @@ function transformAlias(
         matchedAlias.find,
         replacement + (endsWithSlash ? '/' : '')
       )
-      const normalizedPath = normalizePath(relative(dir, resolve(dir, truthPath)))
 
-      return normalizedPath.startsWith('.') ? normalizedPath : `./${normalizedPath}`
+      const absolutePath = resolve(dir, truthPath)
+      const normalizedPath = normalizePath(relative(dir, absolutePath))
+      const resultPath = normalizedPath.startsWith('.') ? normalizedPath : `./${normalizedPath}`
+
+      if (!isAliasGlobal(matchedAlias)) return resultPath
+      if (importResolves(absolutePath)) return resultPath
     }
   }
 

src/utils.ts

@@ -438,6 +438,33 @@ export function parseTsAliases(basePath: string, paths: ts.MapLike<string[]>) {
   return result
 }
 
+const rootAsteriskImportRE = /^(?!\.{1,2}\/)([^*]+)$/
+export function isAliasGlobal(alias: Alias) {
+  return alias.find.toString() === rootAsteriskImportRE.toString()
+}
+
+export function importResolves(path: string) {
+  const files = [
+    '.js',
+    '.jsx',
+    '.ts',
+    '.tsx',
+    '.json',
+    '.mjs',
+    '.cjs',
+    '.d.ts',
+    '.vue',
+    '.vue.d.ts'
+  ]
+
+  for (const ext of files) {
+    if (existsSync(path + ext)) {
+      return true
+    }
+  }
+  return false
+}
+
 export function tryGetPackageInfo(name: string) {
   if (process.versions.pnp) {
     const targetRequire = createRequire(import.meta.url)

tests/__fixtures__/resolvePath.ts

@@ -0,0 +1 @@
+export {}

tests/__fixtures__/test.resolvePath.ts

@@ -0,0 +1 @@
+export {}

tests/__fixtures__/utils/test.data.ts

@@ -0,0 +1 @@
+export {}

tests/transform.spec.ts

@@ -94,7 +94,7 @@ describe('transform tests', () => {
       { find: /^~\//, replacement: resolve(__dirname, '../src/') },
       // '$src/*' -> '/src/*'
       { find: '$src', replacement: resolve(__dirname, '../src') },
-      // '*' -> '/*'
+      // '*' -> '/tests/__fixtures__/*' (needs real path here to test if local file exists)
       {
         find: /^(?!\.{1,2}\/)([^*]+)$/,
         replacement: resolve(__dirname, '../tests/__fixtures__/$1')
@@ -125,8 +125,8 @@ describe('transform tests', () => {
     }> = [
       {
         description: 'type import alias at root level',
-        content: 'import type { TestBase } from "@/test";',
-        output: "import { TestBase } from '../test';\n"
+        content: 'import type { TestBase } from "@/src/test";',
+        output: "import { TestBase } from './test';\n"
       },
       {
         description: 'dynamic import inside subfolder with alias at root level',
@@ -207,7 +207,7 @@ describe('transform tests', () => {
       },
       {
         description: 'wildcard alias at root, relative import',
-        filePath: './tests/__fixtures__/resolvePath.ts',
+        filePath: './tests/__fixtures__/index.ts',
         content: 'import { TestBase } from "resolvePath";',
         output: "import { TestBase } from './resolvePath';\n"
       },