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ilsubyeega/generate-firebase-fid.js

Created April 30, 2025 05:23
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generate-firebase-fid.js
// from https://github.com/firebase/firebase-js-sdk/blob/ea1f9139e6baec0269fbb91233fd3f7f4b0d5875/packages/installations/src/helpers/generate-fid.ts#L20
const fidByteArray = new Uint8Array(17);
self.crypto.getRandomValues(fidByteArray);
fidByteArray[0] = 0b01110000 + (fidByteArray[0] % 0b00010000)
const fid = btoa(String.fromCharCode(...fidByteArray)).replace(/\+/g, '-').replace(/\//g, '_').substr(0,22);
/^[cdef][\w-]{21}$/.test(fid)
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