fix: absolute entry when bundle DTS (#120)

e2e/cases/dts/bundle/absolute-entry/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "dts-bundle-absolute-entry-test",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module"
+}

e2e/cases/dts/bundle/absolute-entry/rslib.config.ts

@@ -0,0 +1,20 @@
+import { join } from 'node:path';
+import { generateBundleCjsConfig, generateBundleEsmConfig } from '@e2e/helper';
+import { defineConfig } from '@rslib/core';
+
+export default defineConfig({
+  lib: [
+    generateBundleEsmConfig({
+      dts: {
+        bundle: true,
+      },
+    }),
+    generateBundleCjsConfig(),
+  ],
+  source: {
+    entry: {
+      index: join(__dirname, '../__fixtures__/src/index.ts'),
+    },
+    tsconfigPath: '../__fixtures__/tsconfig.json',
+  },
+});

e2e/cases/dts/index.test.ts

@@ -115,4 +115,13 @@ describe('dts when bundle: true', () => {
       `"<ROOT>/e2e/cases/dts/bundle/bundle-name/dist/esm/bundleName.d.ts"`,
     );
   });
+
+  test('entry is an absolute path', async () => {
+    const fixturePath = join(__dirname, 'bundle', 'absolute-entry');
+    const { entryFiles } = await buildAndGetResults(fixturePath, 'dts');
+
+    expect(entryFiles.esm).toMatchInlineSnapshot(
+      `"<ROOT>/e2e/cases/dts/bundle/absolute-entry/dist/esm/index.d.ts"`,
+    );
+  });
 });

packages/plugin-dts/src/dts.ts

@@ -1,5 +1,5 @@
 import fs from 'node:fs';
-import { basename, dirname, join, relative } from 'node:path';
+import { basename, dirname, isAbsolute, join, relative } from 'node:path';
 import { logger } from '@rsbuild/core';
 import color from 'picocolors';
 import ts from 'typescript';
@@ -141,7 +141,9 @@ export async function generateDts(data: DtsGenOptions): Promise<void> {
   let entry = '';
 
   if (bundle === true && entryPath) {
-    const entrySourcePath = join(cwd, entryPath);
+    const entrySourcePath = isAbsolute(entryPath)
+      ? entryPath
+      : join(cwd, entryPath);
     const relativePath = relative(rootDir, dirname(entrySourcePath));
     entry = join(
       declarationDir!,