| # Logging |
| |
| The `wasm_bindgen_webidl` crate (used by `web-sys`'s `build.rs`) uses |
| [`env_logger`][env_logger] for logging, which can be enabled by setting the |
| `RUST_LOG=wasm_bindgen_webidl` environment variable while building the `web-sys` |
| crate. |
| |
| Make sure to enable "very verbose" output during `cargo build` to see these logs |
| within `web-sys`'s build script output. |
| |
| ```sh |
| cd crates/web-sys |
| RUST_LOG=wasm_bindgen_webidl cargo build -vv |
| ``` |
| |
| If `wasm_bindgen_webidl` encounters WebIDL constructs that it doesn't know how |
| to translate into `wasm-bindgen` AST items, it will emit warn-level logs. |
| |
| ``` |
| WARN 2018-07-06T18:21:49Z: wasm_bindgen_webidl: Unsupported WebIDL interface: ... |
| ``` |
| |
| [env_logger]: https://crates.io/crates/env_logger |
