Boa's boa_runtime crate contains an example runtime and basic runtime features and functionality for the boa_engine crate for runtime implementors.

Example: Adding Web API's Console Object

1. Add boa_runtime as a dependency to your project along with boa_engine.

use boa_engine::{js_string, property::Attribute, Context, Source};
use boa_runtime::Console;

// Create the context.
let mut context = Context::default();

// Initialize the Console object.
let console = Console::init(&mut context);

// Register the console as a global property to the context.
context
.register_global_property(js_string!(Console::NAME), console, Attribute::all())
.expect("the console object shouldn't exist yet");

// JavaScript source for parsing.
let js_code = "console.log('Hello World from a JS code string!')";

// Parse the source code
match context.eval(Source::from_bytes(js_code)) {
Ok(res) => {
println!(
"{}",
res.to_string(&mut context).unwrap().to_std_string_escaped()
);
}
Err(e) => {
// Pretty print the error
eprintln!("Uncaught {e}");
# panic!("An error occured in boa_runtime's js_code");
}
};