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The Bun.file() function accepts a path and returns a BunFile instance. The BunFile class extends Blob and allows you to lazily read the file in a variety of formats. Use .text() to read the contents as a string. 
const path = '/path/to/file.txt';
const file = Bun.file(path);

const text = await file.text();
// string
Any relative paths will be resolved relative to the project root (the nearest directory containing a package.json file). 
const path = './file.txt';
const file = Bun.file(path);