Imported from keplar-404/screen-shot-to-code (.agents/skills/bun-codesign-a-single-file-javascript-executable-on-macos/SKILL.md). Install upstream with npx skills add keplar-404/screen-shot-to-code --skill bun-codesign-a-single-file-javascript-executable-on-macos. Copyright stays with the author.

Codesign a single-file JavaScript executable on macOS

Fix the "can't be opened because it is from an unidentified developer" Gatekeeper warning when running your JavaScript executable.

Compile your executable using the --compile flag.

bun build --compile ./path/to/entry.ts --outfile myapp

List your available signing identities. One of these will be your signing identity that you pass to the codesign command. This command requires macOS.

security find-identity -v -p codesigning

1. XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX "Developer ID Application: Your Name (ZZZZZZZZZZ)"
   1 valid identities found

Optional, but recommended: create an entitlements.plist file with the necessary permissions for the JavaScript engine to work correctly.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.cs.allow-jit</key>
    <true/>
    <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
    <true/>
    <key>com.apple.security.cs.disable-executable-page-protection</key>
    <true/>
    <key>com.apple.security.cs.allow-dyld-environment-variables</key>
    <true/>
    <key>com.apple.security.cs.disable-library-validation</key>
    <true/>
</dict>
</plist>

Sign your executable using the codesign command and verify it works.

codesign --entitlements entitlements.plist -vvvv --deep --sign "XXXXXXXXXX" ./myapp --force
codesign -vvv --verify ./myapp

For more information on macOS codesigning, refer to Apple's Code Signing documentation. For details about creating single-file executables with Bun, see Standalone Executables. This guide requires Bun v1.2.4 or newer.