#776

Summary

Adds cross-platform executable building support to --exe feature via a new @tsdown/exe package. Users can specify target platforms, architectures, and Node.js versions to build executables for different OS/arch combinations.

Changes

New package: @tsdown/exe

• platform.ts — Types (ExeTarget, ExePlatform, ExeArch, ExeExtensionOptions) and URL construction for nodejs.org binary downloads
• cache.ts — System cache directory resolution (XDG, macOS Library/Caches, Windows LOCALAPPDATA)
• download.ts — Downloads and extracts Node.js binaries, with caching and debug logging (tsdown:exe:download)
• index.ts — Public API exports
• Node version validation: requires >=18.16.0 (SEA support)
• Dependencies: semver, tinyexec, obug

Modified: src/features/exe.ts

• ExeOptions now extends ExeExtensionOptions from @tsdown/exe (adds targets field)
• buildExe() refactored to handle both single-platform and cross-platform builds
• Extracted buildSingleExe() and resolveOutputFileName() helpers
• Cross-platform builds: lazy-loads @tsdown/exe, downloads target Node.js binary, sets SEA executable option
• Platform-aware output naming (.exe suffix, platform-arch suffix)
• Improved error handling with throwOnError and stdio: 'inherit' for tinyexec calls
• Improved codesign logic for cross-platform darwin targets

Other changes

• @tsdown/exe added as optional peer dependency and dev dependency
• scripts/release.ts: improved tinyexec error handling
• src/features/pkg/exports.ts: support inlinedDependencies field
• Various dependency and export configuration updates

Usage

export default {
  exe: {
    targets: [
      { platform: 'linux', arch: 'x64', nodeVersion: '25.7.0' },
      { platform: 'darwin', arch: 'arm64', nodeVersion: '25.7.0' },
      { platform: 'win', arch: 'x64', nodeVersion: '25.7.0' },
    ],
  },
}