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Firestore Bytes serializing not working on admin SDK[Firestore]

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#2,476 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
node.js, typescript
Domain
database

Research direction

Start with the supplied Node.js reproduction using Firebase SDK 13.1, Node.js 20.11, and the Admin SDK, focusing on the Firestore document serialization boundary. No repository file or test is named; done means establishing whether the Bytes/Uint8Array representations can be stored consistently and covering the confirmed behavior with a regression test.

Written by the indexing model from the issue text.

Description

api: firestore
  • Operating System version:w10
  • Firebase SDK version: 13.1
  • Firebase Product: Firestore
  • Node.js version: 20.11
  • NPM version: 10.3

When trying to store uint8array as Firestore.Bytes from admin-sdk throw a serializing error:

Error: Value for argument "data" is not a valid Firestore document. Couldn't serialize object of type "Bytes" (found in field "binaryData"). Firestore doesn't support JavaScript objects with custom prototypes (i.e. objects that were created via the "new" operator).

Uint8array seems to be the way to go, but then mismatch Web SDK (web sdk return bytes array as Firestore.Bytes objects).

Steps to reproduce:
import { Bytes } from "firebase/firestore";

const bin = new Uint8Array([0x48, 0x65, 0x6C, 0x6C, 0x6F]);

const fsBytes = Bytes.fromUint8Array(bin);

db.collection('your_collection').doc('your_document').set({
  binaryData: fsBytes
});
Dominant language
TypeScript
Stars
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Forks
419
Avg merge
4d 20h
Merged PRs (30d)
16

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