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Update CONTRIBUTING.md

Adding debugging help
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Jason Williams 5 years ago committed by GitHub
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      CONTRIBUTING.md

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CONTRIBUTING.md

@ -25,6 +25,19 @@ If you don't already have Rust installed rustup is the recommended tool to use.
Then simply clone this project and `cargo build` Then simply clone this project and `cargo build`
### Debugging
You can see the output of tokens by adding a `dbg!(&tokens);` here:
https://github.com/jasonwilliams/boa/blob/master/src/lib/lib.rs#L31
This is useful to know if the tokens are in the right order, or any unexpected tokens are appearing.
The parser's expression tree can be viewed by adding `dbg!(&expr)` here:
https://github.com/jasonwilliams/boa/blob/master/src/lib/lib.rs#L34
To get a full backtrace you will need to set the environment variable `RUST_BACKTRACE=1`
### Web Assembly ### Web Assembly
If you want to develop on the web assembly side you can run yarn serve then go to http://localhost:8080 If you want to develop on the web assembly side you can run yarn serve then go to http://localhost:8080

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