fix bun path for one-shot review workspaces

src/workspace-package-manager.test.ts

@@ -218,6 +218,24 @@ describe('workspace package manager helpers', () => {
     expect(execFileSyncMock).not.toHaveBeenCalled();
   });
 
+  it('prepends the current Bun binary directory for bun workspace commands', () => {
+    const repoDir = path.join(tempRoot, 'bun-workspace');
+    fs.mkdirSync(repoDir, { recursive: true });
+    fs.writeFileSync(
+      path.join(repoDir, 'package.json'),
+      JSON.stringify({ packageManager: 'bun@1.3.13' }),
+    );
+
+    const env = buildWorkspaceCommandEnvironment(repoDir, 'bun', {
+      PATH: '/tmp/bin',
+    });
+
+    const expectedBunBinDir = path.basename(process.execPath).startsWith('bun')
+      ? path.dirname(process.execPath)
+      : path.join(os.homedir(), '.bun', 'bin');
+    expect(env.PATH?.split(path.delimiter)[0]).toBe(expectedBunBinDir);
+  });
+
   it('disables corepack project specs only for lockfile-selected pnpm workspaces under a conflicting ancestor', () => {
     const parentDir = path.join(tempRoot, 'parent');
     fs.mkdirSync(parentDir, { recursive: true });

src/workspace-package-manager.ts

@@ -118,6 +118,36 @@ function buildCorepackCommand(
   };
 }
 
+function prependPathEntry(
+  baseEnv: NodeJS.ProcessEnv,
+  entry: string | null,
+): NodeJS.ProcessEnv {
+  if (!entry) {
+    return baseEnv;
+  }
+  const currentPath = baseEnv.PATH ?? '';
+  const entries = currentPath.split(path.delimiter).filter(Boolean);
+  if (entries.includes(entry)) {
+    return baseEnv;
+  }
+  return {
+    ...baseEnv,
+    PATH: [entry, ...entries].join(path.delimiter),
+  };
+}
+
+function resolveCurrentBunBinDir(): string | null {
+  if (path.basename(process.execPath).startsWith('bun')) {
+    return path.dirname(process.execPath);
+  }
+  const home = process.env.HOME;
+  if (!home) {
+    return null;
+  }
+  const candidate = path.join(home, '.bun', 'bin');
+  return fs.existsSync(path.join(candidate, 'bun')) ? candidate : null;
+}
+
 function findNearestAncestorPackageManager(
   repoDir: string,
 ): WorkspacePackageManager | null {
@@ -144,6 +174,10 @@ export function buildWorkspaceCommandEnvironment(
   packageManager: WorkspacePackageManager,
   baseEnv: NodeJS.ProcessEnv = process.env,
 ): NodeJS.ProcessEnv {
+  if (packageManager === 'bun') {
+    return prependPathEntry(baseEnv, resolveCurrentBunBinDir());
+  }
+
   if (packageManager !== 'pnpm') {
     return baseEnv;
   }