@renproject/ren/module/utils/transactionEmitter.js

Official Ren JavaScript SDK for bridging crypto assets cross-chain.

import { EventEmitter } from "events";
// The TransactionEmitter extends the built-in EventEmitter, adding the ability
// to retrieve previous transactions that have been emitted.
export class TransactionEmitter extends EventEmitter {
    constructor(getTransactions) {
        super();
        this.addListener = (event, callback) => {
            // Emit previous deposit events.
            if (event === "transaction") {
                this.getTransactions().map(callback);
            }
            super.on(event, callback);
            return this;
        };
        /**
         * `on` creates a new listener to `"transaction"` events, returning
         * [[GatewayTransaction]] instances.
         *
         * `on` extends `EventEmitter.on`, modifying it to immediately return all
         * previous `"transaction"` events, in addition to new events, when a new
         * listener is created.
         *
         * @category Main
         */
        this.on = (event, callback) => this.addListener(event, callback);
        this.once = (event, callback) => super.once(event, callback);
        this.getTransactions = getTransactions;
    }
}
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