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27 lines
715 B
Rust
27 lines
715 B
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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//! This example shows you how to define ops in Rust and then call them from
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//! JavaScript.
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use deno_core::Extension;
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use deno_core::JsRuntime;
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use deno_core::RuntimeOptions;
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fn main() {
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let my_ext = Extension::builder()
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.middleware(|name, opfn| match name {
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"op_print" => deno_core::void_op_sync(),
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_ => opfn,
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})
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.build();
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// Initialize a runtime instance
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let mut runtime = JsRuntime::new(RuntimeOptions {
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extensions: vec![my_ext],
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..Default::default()
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});
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// Deno.core.print() will now be a NOP
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runtime
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.execute_script("<usage>", r#"Deno.core.print("I'm broken")"#)
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.unwrap();
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}
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