
A Firestore emulator without Java, in one Rust binary
hidane replaces the official Cloud Firestore emulator with a single Rust binary: no JDK, a 5.5 ms start, 7.4 MiB idle. It speaks gRPC, REST and WebChannel, enforces Security Rules, and runs under firebase-tools, where Firestore-triggered Cloud Functions fire as with the official emulator (new in v0.4). Parity is measured, not claimed: hidane's tests replay 20,224 answers recorded from the official emulator, and firebase-js-sdk's own browser suite passes.
Hidane is an open-source Firestore emulator implemented as a single Rust binary, eliminating the need for a Java Development Kit. It supports gRPC, REST, and WebChannel, enforces Security Rules, and integrates with firebase-tools, achieving functional parity with the official emulator through extensive testing.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.