beaverjs/dist/ContentEventHandler.js

An abstraction around WebExtension messaging

import { BaseEventHandler } from './BaseEventHandler';
import { Destination, isBackground, isContent, isContext, isWorker } from './destination';
import { listen } from './listeners';
export class ContentEventHandler extends BaseEventHandler {
    constructor(listenFrom = ['context', 'background']) {
        super();
        this.listenFrom = listenFrom;
    }
    emitBackground(key, data) {
        return this.emit(key, data, Destination.Background);
    }
    emitContext(key, data) {
        return this.emit(key, data, Destination.Context);
    }
    sendEvent(serialized, destination) {
        destination !== null && destination !== void 0 ? destination : (destination = Destination.Passthrough);
        if (isContext(destination) || (isContent(destination) && isWorker(destination))) {
            postMessage({ destination, data: serialized }, '*');
        }
        if (isBackground(destination) && globalThis.browser) {
            browser.runtime.sendMessage({ destination, data: serialized });
        }
    }
    serialize(type, data) {
        return { data, event: type };
    }
    deserialize(serialized) {
        return { data: serialized.data, type: serialized.event };
    }
    setup() {
        listen({
            thisActor: 'content',
            listenFrom: new Set(this.listenFrom),
            onMessage: (msg, sender) => {
                this.handleSerialized(msg.data, sender);
            },
        });
    }
}
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