Feature flags of Rustyscript crate // Lib.rs

Cargo Features

[dependencies]
rustyscript = { version = "0.10.0", default-features = false, features = ["safe_extensions", "all_extensions", "network_extensions", "io_extensions", "extra_features", "node_experimental", "web_stub", "broadcast_channel", "cache", "console", "cron", "crypto", "ffi", "fs", "http", "kv", "io", "url", "web", "webgpu", "webidl", "webstorage", "websocket", "fs_import", "url_import", "snapshot_builder", "worker", "toml"] }

default = safe_extensions, worker

These default features are set whenever rustyscript is added without default-features = false somewhere in the dependency tree.

safe_extensions default = console, crypto, url, web_stub

Feature groups

Extensions that are safe to use in a sandboxed environment These extensions do not provide access to the network or filesystem

all_extensions node_experimental? = io_extensions, network_extensions

Enables all available extensions, except for node support These extensions are not safe to use in a sandboxed environment without additional restrictions (See [WebPermissions]

network_extensions all_extensions? = broadcast_channel, console, crypto, http, url, url_import, web, websocket, webstorage

Extensions that provide access to the network. Also enables URL imports from JS These extensions are not safe to use in a sandboxed environment without additional restrictions (See [WebPermissions]

io_extensions all_extensions? = cache, console, cron, ffi, fs, fs_import, io, kv, web, webgpu, webstorage

Extensions that provide access to the filesystem. Also enables file imports from JS These extensions are not safe to use in a sandboxed environment without additional restrictions (See [FsPermissions]

extra_features = snapshot_builder, worker

Additional features that are not part of the core runtime These features are safe to use in a sandboxed environment without additional restrictions

node_experimental = all_extensions, checksum, deno_napi, deno_node, deno_npm, deno_resolver, deno_runtime, deno_semver, node_resolver

Highly experimental NodeJS compatibility layer. Enables all other extensions Enables the use of the node and npm modules
CJS support not yet implemented
These extensions are not safe to use in a sandboxed environment without additional restrictions (See [NodePermissions]

Affects ext::napi, ext::node, ext::runtime, ext::ExtensionOptions.node_resolver, inner_loader::LoaderOptions.node_resolver…

Required by the update_deno binary

web_stub safe_extensions = base64-simd, webidl

By default, an extension stub is included in the runtime if the web feature is disabled It provides a minimal set of APIs for parts of the runtime, such as timers and the DOM exception class It maintains sandboxing by not providing access to the network or filesystem

It does however require the webidl extension to be enabled By disabling this feature, you can opt out of the web stub extension, and the webidl extension

The primary use-case for this is for creating a runtime using a deno_core version incompatible with the deno extensions

Note that by turning off both web_stub and web, btoa/atob and timer APIs will not be available

Affects ext::web_stub…

broadcast_channel network_extensions? = deno_broadcast_channel, web, webidl

Each feature in this section corresponds to a different deno extension I have annotated each with the section of the w3c spec that it implements

https://html.spec.whatwg.org/multipage/web-messaging.html

Affects ext::broadcast_channel, ext::ExtensionOptions.broadcast_channel…

cache io_extensions? = deno_cache, web, webidl

https://w3c.github.io/ServiceWorker/#cache-interface

Affects ext::cache, ext::ExtensionOptions.cache…

console cron? io_extensions? kv? network_extensions? safe_extensions web? = deno_console, deno_terminal

https://console.spec.whatwg.org/

Affects ext::console…

cron io_extensions? = console, deno_cron

Implements scheduled tasks (crons) API

Affects ext::cron…

crypto network_extensions? safe_extensions web? = deno_crypto, webidl

https://www.w3.org/TR/WebCryptoAPI/

Affects ext::crypto, ext::ExtensionOptions.crypto_seed…

ffi io_extensions? = deno_ffi

Dynamic library ffi

Affects ext::ffi…

fs io_extensions? = deno_fs, io, web

Provides ops for interacting with the file system.

Affects ext::fs, ext::ExtensionOptions.filesystem…

http network_extensions? = deno_http, web, websocket

https://fetch.spec.whatwg.org/

Affects ext::http…

kv io_extensions? = console, deno_kv, web

https://github.com/denoland/denokv/blob/main/proto/kv-connect.md

Affects ext::kv, ext::ExtensionOptions.kv_store…

io fs? io_extensions? = deno_io, libc, nix, once_cell, rustyline, web, winapi

Provides IO primitives for other Deno extensions (stdio streams, etc)

Affects ext::io, ext::ExtensionOptions.io_pipes…

url network_extensions? safe_extensions web? = deno_url, webidl

https://url.spec.whatwg.org/ https://wicg.github.io/urlpattern/

Affects ext::url…

web broadcast_channel? cache? fs? http? io? io_extensions? kv? network_extensions? webgpu? websocket? = console, crypto, deno_fetch, deno_net, deno_permissions, deno_tls, deno_web, fs_import, hyper-util, url, url_import, webidl

Timers, events, text encoder/decoder, https://w3c.github.io/FileAPI https://fetch.spec.whatwg.org/

Enables http

Affects ext::web, ext::ExtensionOptions.web…

webgpu io_extensions? = deno_webgpu, web

https://gpuweb.github.io/gpuweb/

Affects ext::webgpu…

webidl broadcast_channel? cache? crypto? url? web? web_stub? webstorage? = deno_webidl

https://webidl.spec.whatwg.org/

Affects ext::webidl…

webstorage io_extensions? network_extensions? = deno_webstorage, webidl

https://html.spec.whatwg.org/multipage/webstorage.html

Affects ext::webstorage, ext::ExtensionOptions.webstorage_origin_storage_dir…

websocket http? network_extensions? = deno_websocket, web

https://websockets.spec.whatwg.org/

Affects ext::websocket…

fs_import io_extensions? web?

Features for the module loader
- fs_import allows arbitrary file imports
- url_import allows importing from the web

Both fs_import and url_import will break sandboxing

url_import network_extensions? web? = reqwest

snapshot_builder extra_features?

Enables the use of the SnapshotBuilder runtime
It is used to create a snapshot of a runtime for faster startup times

worker default extra_features?

Enables the threaded worker API

Affects rustyscript::worker…

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.