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# Contributing to `source-map-mappings`
## Building
To build the core library for the host target (for use with testing):
```
$ cargo build
```
To build for WebAssembly, ensure that you have the `wasm32-unknown-unknown` target:
```
$ rustup update
$ rustup target add wasm32-unknown-unknown --toolchain nightly
```
Then, cross compile to a `.wasm` file via the WebAssembly API crate:
```
$ cd source-map-mappings-wasm-api/
$ ./build.py -o output.wasm
```
The `build.py` script handles shrinking the size of the resulting `.wasm` file
for you, with `wasm-gc`, `wasm-snip`, and `wasm-opt`.
For more details, run:
```
$ ./build.py --help
```
## Testing
To run all the tests:
```
$ cargo test
```
## Automatic code formatting
We use [`rustfmt`](https://github.com/rust-lang-nursery/rustfmt) to enforce a
consistent code style across the whole code base.
You can install the latest version of `rustfmt` with this command:
```
$ rustup update nightly
$ cargo install -f rustfmt-nightly
```
Ensure that `~/.cargo/bin` is on your path.
Once that is taken care of, you can (re)format all code by running this command:
```
$ cargo fmt
```
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