bun build should fallback to bun run build when no entrypoints are provided

[minorcell]

What version of Bun is running?

1.3.3

What platform is your computer?

Darwin 25.1.0 arm64 arm

What steps can reproduce the bug?

1. Add a build script to package.json:

"scripts": {
  "start": "bun run index.ts",
  "build": "bun build index.ts"
}

2. Run bun build (no arguments):

bun build v1.3.3 (274e01c7)
error: Missing entrypoints. What would you like to bundle?

Usage:
  $ bun build <entrypoint> [...<entrypoints>] [...flags]

To see full documentation:
  $ bun build --help

What is the expected behavior?

bun build is always treated as Bun’s built-in build subcommand. However, many projects define a build script, and when users run bun build with no arguments, it’s natural to expect it to behave like bun run build. Expected: if bun build is invoked with no positional args/flags and a build script exists, Bun should fall back to running the project script (bun run build). Actual: Bun still treats it as the internal build command.

What do you see instead?

bun build v1.3.3 (274e01c7)
error: Missing entrypoints. What would you like to bundle?

Usage:
  $ bun build <entrypoint> [...<entrypoints>] [...flags]  

To see full documentation:
  $ bun build --help

Additional information

Of course, strictly speaking, this isn't a bug, but I think fixing this usage is more in line with Bun's all-in-one philosophy.

[github-actions[bot]]

Found 1 possible duplicate issue:

1. https://github.com/oven-sh/bun/issues/23093

This issue will be automatically closed as a duplicate in 3 days.

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[github-actions[bot]]

Duplicate of #23093.

This issue has been automatically closed as a duplicate.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code