// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
//! This example shows you how to define ops in Rust and then call them from
//! JavaScript.
use deno_core::Extension;
use deno_core::JsRuntime;
use deno_core::RuntimeOptions;
fn main() {
let my_ext = Extension {
name: "my_ext",
middleware_fn: Some(Box::new(|op| match op.name {
"op_print" => op.disable(),
_ => op,
})),
..Default::default()
};
// Initialize a runtime instance
let mut runtime = JsRuntime::new(RuntimeOptions {
extensions: vec![my_ext],
..Default::default()
});
// Deno.core.print() will now be a NOP
runtime
.execute_script("<usage>", r#"Deno.core.print("I'm broken")"#)
.unwrap();
}