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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v.
2.
0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
http://mozilla.org/MPL/2.
0/. */
interface mixin JSActor {
[Throws]
undefined sendAsyncMessage(DOMString messageName,
optional any obj,
optional any transferables);
/**
* Note that transfers are currently not supported by sendQuery. See Bug
1579536.
*/
[NewObject]
Promise<any> sendQuery(DOMString messageName,
optional any obj);
readonly attribute UTF8String name;
};
/**
* WebIDL callback interface version of the nsIObserver interface for use when
* calling the observe method on JSActors.
*
* NOTE: This isn't marked as ChromeOnly, as it has no interface object, and
* thus cannot be conditionally exposed.
*/
[Exposed=Window]
callback interface MozObserverCallback {
undefined observe(nsISupports subject, ByteString topic, DOMString? data);
};
/**
* WebIDL callback interface calling the `didDestroy`, and
* `actorCreated` methods on JSActors.
*/
[MOZ_CAN_RUN_SCRIPT_BOUNDARY]
callback MozJSActorCallback = undefined();
/**
* The didDestroy method, if present, will be called after the actor is no
* longer able to receive any more messages.
* The actorCreated method, if present, will be called immediately after the
* actor has been created and initialized.
*/
[GenerateInit]
dictionary MozJSActorCallbacks {
[ChromeOnly] MozJSActorCallback didDestroy;
[ChromeOnly] MozJSActorCallback actorCreated;
};
/**
* Base class for the data structures used to register JS actors.
*/
dictionary JSActorOptions {
/**
* An array of remote types which restricts where the child side of the actor
* can be instantiated. If this is defined, then the remote type prefix of
* the process where the child side of the actor is being instantiated must
* begin with one of the strings in the array. For example, if Fission is
* enabled, the prefix of a child process's remote type will be `webIsolated`.
* This would be matched by both `"web"` and `"webIsolated"`.
*
* The special string `"parent"` is used to match the parent process, as its
* actual remote type cannot be cleanly included in the list. (As of May
2026
* `NOT_REMOTE_TYPE` is `null` in JS, and `VoidCString()` in C++.)
*
* If not passed, all processes are allowed to instantiate the actor.
*/
sequence<UTF8String> remoteTypes;
};
dictionary JSActorSidedOptions {
/**
* The ESM path which should be loaded for the actor on this side.
*
* If this is not passed, the specified side cannot receive messages, but may
* send them using `sendAsyncMessage` or `sendQuery`.
*/
ByteString esModuleURI;
};