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denoland-deno/core/examples/disable_ops.rs

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// Copyright 2018-2021 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::builder()
.middleware(|name, opfn| match name {
"op_print" => deno_core::void_op_sync(),
_ => opfn,
})
.build();
// 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();
}