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Compile your executable using the --compile flag. 
bun build --compile ./path/to/entry.ts --outfile myapp
List your available signing identities. You’ll pass one of these to codesign in a later step. This command requires macOS.
terminal
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.
entitlements.plist
<?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.
terminal
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.