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31 lines
1.5 KiB
Markdown
31 lines
1.5 KiB
Markdown
# Deno Core Crate
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[](https://crates.io/crates/deno_core)
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[](https://docs.rs/deno_core)
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The main dependency of this crate is
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[rusty_v8](https://github.com/denoland/rusty_v8), which provides the V8-Rust
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bindings.
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This Rust crate contains the essential V8 bindings for Deno's command-line
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interface (Deno CLI). The main abstraction here is the JsRuntime which provides
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a way to execute JavaScript.
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The JsRuntime implements an event loop abstraction for the executed code that
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keeps track of all pending tasks (async ops, dynamic module loads). It is user's
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responsibility to drive that loop by using `JsRuntime::run_event_loop` method -
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it must be executed in the context of Rust's future executor (eg. tokio, smol).
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Rust functions can be registered in JavaScript using `deno_core::Extension`. Use
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the `Deno.core.ops.op_name()` and `Deno.core.opAsync("op_name", ...)` functions
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to trigger the op function callback. A conventional way to write ops is using
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the [`deno_ops`](https://github.com/denoland/deno/blob/main/ops) crate.
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Documentation for this crate is thin at the moment. Please see
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[hello_world.rs](https://github.com/denoland/deno/blob/main/core/examples/hello_world.rs)
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and
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[http_bench_json_ops/main.rs](https://github.com/denoland/deno/blob/main/core/examples/http_bench_json_ops/main.rs)
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as examples of usage.
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TypeScript support and lots of other functionality are not available at this
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layer. See the [CLI](https://github.com/denoland/deno/tree/main/cli) for that.
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