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JSI (JavaScript Interface)

JSI is an interface that enables JavaScript (whether it's JSC or Hermes) to communicate with native code written in C++ and vice versa. It provides a direct communication channel between JavaScript and native code, eliminating the need for a bridge.

Usage

Using JSI, you can establish the following communication routes:

  • Android:
    • Java <-> JNI <-> JSI <-> JavaScript.
  • iOS:
    • ObjC <-> JSI <-> JavaScript.

Benchmarking (Test Environment)

  • React Native (RN) version: 0.63.4
  • NDK Version: 22.0.x
  • CMake Version: 3.10.x
  • Test Device: Samsung S10

Operations and Results

Get String from KV Store:

  • Android Shared Prefs over JSI:
    • JSI (Async - Spawn a thread on Java): ~5 MS (Min 2 MS - Max 8 MS)
    • JSI (Sync): ~2 MS (Min 1 MS - Max 3 MS)
  • Async Storage: ~22 MS (Min 12 MS - Max 35 MS)
  • Android Shared Pref over Bridge: ~14 MS (Min 8 MS - Max 20 MS)

Get a Java String to JS through JNI and JSI:

  • JSI: <=1 MS (Min 0 MS - Max 1 MS)
  • Bridge: ~8 MS (Min 6 MS - Max 15 MS)

Get a Java Object (Two String properties) to JS through JNI and JSI:

  • JSI: <=1 MS (Min 0 MS - Max 1 MS)
  • Bridge: ~14 MS (Min 10 MS - Max 18 MS)

Query 100 Rows from Table:

  • JSI (Cursor iteration on Java): ~15 MS (Min 10 MS - Max 20 MS)
  • JSI (Cursor iteration on JS): ~22 MS (Min 15 MS - Max 30 MS)
  • Bridge: ~45 MS (Min 30 MS - Max 60 MS)

License

This project is licensed under the MIT License.