wasm-logger

A logger that sends a message with its Rust source's line and filename to the browser console.

screenshot

The log entry's format is: $LOG_LEVEL $LINE_NUMBER:$FILE_PATH $MESSAGE

Usage

Note: For more information about how to use loggers in Rust, see log.

Cargo.toml [dependencies] log = "0.4" wasm-logger = "0.1.3" Initialize wasm-logger when your app start: ```rust wasmlogger::init(wasmlogger::Config::new(log::Level::Debug));

// Logging log::info!("Some info"); log::error!("Error message"); ```

Log for a specific module only

You can provide a path prefix: rust wasm_logger::init(wasm_logger::Config::with_prefix(log::Level::Debug, "some::module"));

then, wasm-logger only logs message from some::module

Mapping from `log` to console's methods

log::error!, log::warn! and log::info! call theirs equivalent methods of the browser console. The console.trace method outputs some extra trace from the generated JS glue code which we don't want. Therefore, we choose to map: * log::debug! to console.log * log::trace! to console.debug.

Note for Chromium/Chrome users

Chromium/Chrome filters out console.debug (execute by log::trace!) by default. You must check the Verbose filter in your browser console to see trace entries.

License