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denoland-deno/core/examples/disable_ops.rs
Aaron O'Mullan 4154e95ae5 feat(core): disableable extensions & ops (#14063)
Streamlines a common middleware pattern and provides foundations for avoiding variably sized v8::ExternalReferences & enabling fully monomorphic op callpaths
2022-04-07 09:42:33 -04:00

27 lines
695 B
Rust

// Copyright 2018-2022 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(|op| match op.name {
"op_print" => op.disable(),
_ => op,
})
.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();
}