bun.sh/docs/cli/bun-init.md

bun init is a quick way to start a blank project with Bun. It guesses with sane defaults and is non-destructive when run multiple times.

It creates:

• a package.json file with a name that defaults to the current directory name
• a tsconfig.json file or a jsconfig.json file, depending if the entry point is a TypeScript file or not
• an entry point which defaults to index.ts unless any of index.{tsx, jsx, js, mts, mjs} exist or the package.json specifies a module or main field
• a README.md file

If you pass -y or --yes, it will assume you want to continue without asking questions.

At the end, it runs bun install to install bun-types.

How is bun init different than bun create?

bun init is for blank projects. bun create applies templates.