esupgrade

name	esupgrade
description	Auto-update JavaScript and TypeScript syntax to new ECMAScript features based on browser support. Use when the user asks to modernize, upgrade, or clean up JavaScript or TypeScript syntax.
allowed-tools	Bash(npx -y esupgrade *) Read

Use the CLI with npx on files, directories, or standard input:

npx -y esupgrade [--baseline <newly-available|widely-available>] [--check] [--write] <files-or-directories|->

• Use --check to preview changes and fail when updates are needed.
• Use - to read from standard input and write the transformed code to standard output.
• Use --write to apply updates in place for file inputs.
• Use --baseline to choose newly-available or widely-available (default).