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denoland-deno/core/examples/disable_ops.rs
Aaron O'Mullan b518f5e1ba
feat(core): facilitate op-disabling middleware (#11858)
* feat(core): facilitate op-disabling middleware

By providing `void_op_sync()` and `void_op_async() as well as `core/examples/disable_ops.rs`
2021-08-31 13:08:16 +02:00

27 lines
715 B
Rust

// 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();
}