Local development of uniffi-bindgen-react-native

Pre-installation

This guide is in addition to the Pre-installation guides for React Native and WASM.

git clone https://github.com/jhugman/uniffi-bindgen-react-native
cd uniffi-bindgen-react-native

Now you need to run the bootstrap xtask:

cargo xtask bootstrap

The first time you run this will take some time: it clones the main branch of facebook/hermes and builds it.

By default, it checks out the main branch, but this can be customized:

cargo xtask bootstrap hermes --branch rn/0.76-stable

It also builds the cpp/test-harness which is the Javascript runtime which can accept .so files written in C++ and Rust.

You can force a re-setup with:

cargo xtask bootstrap --force

Tests to see if a bootstrap step can be skipped is fairly rudimentary: mostly just the existence of a directory, so switching to a new branch of hermes would be done:

cargo xtask clean
cargo xtask bootstrap hermes --branch rn/0.76-stable
cargo xtask bootstrap

Running tests

Most of the testing for uniffi-bindgen-react-native is done in the fixtures directory by testing the generated Typescript and C++ against a Rust crate.

These can be run with:

./scripts/run-tests.sh

One or more fixtures may be run using the -f flag.

./scripts/run-tests.sh -f chronological -f arithmetic

This, in turn, uses the run xtask.

The run-tests.sh script also runs the Typescript-only tests in the typescript/tests directory.

These have been useful to prototype generated Typescript before moving them into templates.

Running rust only unit tests

Rust unit tests are encouraged! They can be run as usual with:

cargo test

Formatting and linting

Pre-commit, you should ensure that the code is formatted.

The fmt xtask will run cargo fmt, cargo clippy on the Rust, prettier on Typescript and clang-tidy on C++ files.

cargo xtask fmt

Running with the --check does not change the files, just finishes abnormally if any of the formatters find something it would like changed.

cargo xtask fmt --check