Crate deno_core

source ·


pub use anyhow;
pub use futures;
pub use parking_lot;
pub use serde;
pub use serde_json;
pub use serde_v8;
pub use sourcemap;
pub use url;
pub use v8;



Helps embed JS files in an extension. Returns Vec<(&’static str, &’static str)> representing the filename and source code.
A helper macro that will return a call site in Rust code. Should be used when executing internal one-line scripts for JsRuntime lifecycle.


BufMutView is a wrapper around an underlying contiguous chunk of writable bytes. It can be created from a ZeroCopyBuf or a Vec<u8> and implements DerefMut<[u8]> and AsMut<[u8]>.
BufView is a wrapper around an underlying contiguous chunk of bytes. It can be created from a ZeroCopyBuf, bytes::Bytes, or Vec and implements Deref<[u8]> and AsRef<[u8]>.
Basic file system module loader.
Encapsulates an UnboundedSender/UnboundedReceiver pair that together form a duplex channel for sending/receiving messages in V8 session.
A representation of a JavaScript realm tied to a JsRuntime, that allows execution in the realm’s context.
A single execution context of JavaScript. Corresponds roughly to the “Web Worker” concept in the DOM. A JsRuntime is a Future that can be used with an event loop (Tokio, async_std). The JsRuntime future completes when there is an error or when all pending ops have completed.
This structure is used responsible for providing inspector interface to the JsRuntime.
A local inspector session that can be used to send and receive protocol messages directly on the same thread as an isolate.
EsModule source code that will be loaded into V8.
Placeholder structure used when creating a runtime that doesn’t support module loading.
Wrapper around a Future, which causes that Future to be polled immediately.
Maintains the resources and ops inside a JS runtime.
An RcRef encapsulates a reference counted pointer, just like a regular std::rc::Rc. However, unlike a regular Rc, it can be remapped so that it dereferences to any value that’s reachable through the reference-counted pointer. This is achieved through the associated method, RcRef::map(), similar to how std::cell::Ref::map() works. Example:
Map-like data structure storing Deno’s resources (equivalent to file descriptors).
Auto-generated by deno_ops, i.e: #[op]
Auto-generated by deno_ops, i.e: #[op]
Auto-generated by deno_ops, i.e: #[op]
Auto-generated by deno_ops, i.e: #[op]
Auto-generated by deno_ops, i.e: #[op]


Error indicating the reason resolving a module specifier failed.
A type of module to be executed.



The RcLike trait provides an abstraction over std::rc::Rc and RcRef, so that applicable methods can operate on either type.
Resources are Rust objects that are attached to a [deno_core::JsRuntime]. They are identified in JS by a numeric ID (the resource ID, or rid). Resources can be created in ops. Resources can also be retrieved in ops by their rid. Resources are not thread-safe - they can only be accessed from the thread that the JsRuntime lives on.


Normalize all intermediate components of the path (ie. remove “./” and “../” components). Similar to fs::canonicalize() but doesn’t resolve symlinks.
Converts a string representing a relative or absolute path into a ModuleSpecifier. A relative path is considered relative to the current working directory.
Converts a string representing an absolute URL into a ModuleSpecifier.
Takes a string representing either an absolute URL or a file path, as it may be passed to deno as a command line argument. The string is interpreted as a URL if it starts with a valid URI scheme, e.g. ‘http:’ or ‘file:’ or ‘git+ssh:’. If not, it’s interpreted as a file path; if it is a relative path it’s resolved relative to the current working directory.
Pass the command line arguments to v8. Returns a vector of command line arguments that V8 did not understand.

Type Definitions

Returned by resource read/write/shutdown methods
Resolved module specifier
A ResourceId is an integer value referencing a resource. It could be considered to be the Deno equivalent of a file descriptor in POSIX like operating systems. Elsewhere in the code base it is commonly abbreviated to rid.

Attribute Macros