fix: normalize typescript lib path for rollup (#366)

* fix: normalize typescript lib path for rollup

* chore: add tests

* add existsSync test

src/utils.ts

@@ -254,9 +254,10 @@ export function getTsLibFolder({ root, entryRoot }: { root: string, entryRoot: s
   try {
     // try the `require.resolve` method first
     // @see https://stackoverflow.com/questions/54977743/do-require-resolve-for-es-modules
-    libFolder = createRequire(import.meta.url)
-      .resolve('typescript')
-      .replace(/node_modules\/typescript.*/, 'node_modules/typescript')
+    libFolder = normalizePath(createRequire(import.meta.url).resolve('typescript')).replace(
+      /node_modules\/typescript.*/,
+      'node_modules/typescript'
+    )
   } catch {
     // fallback to legacy path method
     libFolder = resolve(root, 'node_modules/typescript')

tests/utils.spec.ts

@@ -2,12 +2,14 @@
 /* eslint-disable promise/param-names */
 
 import { normalize, resolve } from 'node:path'
+import { existsSync } from 'node:fs'
 import { describe, expect, it } from 'vitest'
 
 import {
   base64VLQEncode,
   ensureAbsolute,
   ensureArray,
+  getTsLibFolder,
   isNativeObj,
   isPromise,
   isRegExp,
@@ -171,4 +173,19 @@ describe('utils tests', () => {
     expect(toCapitalCase('-aa bb cc ')).toEqual('AaBbCc')
     expect(toCapitalCase(' -aa bb cc -')).toEqual('AaBbCc')
   })
+
+  it('test: getTsLibFolder', () => {
+    const root = normalizePath(resolve(__dirname, '..'))
+    const entryRoot = resolve(root, 'src')
+
+    expect(
+      getTsLibFolder({ root, entryRoot })
+    ).toMatch(/node_modules\/typescript$/)
+
+    expect(
+      existsSync(
+        getTsLibFolder({ root, entryRoot }) || ''
+      )
+    ).toBe(true)
+  })
 })