bun.sh/docs/guides/read-file/exists.md

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Check if a file exists

The Bun.file() function accepts a path and returns a BunFile instance. Use the .exists() method to check if a file exists at the given path.

const path = "/path/to/package.json";
const file = Bun.file(path);

await file.exists(); // boolean;

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Refer to API > File I/O for more information on working with BunFile.