@ledgerhq/logs/lib/index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.listen = exports.log = void 0;

/**
 * A Log object
 */
let id = 0;
const subscribers = [];
/**
 * log something
 * @param type a namespaced identifier of the log (it is not a level like "debug", "error" but more like "apdu-in", "apdu-out", etc...)
 * @param message a clear message of the log associated to the type
 */

const log = (type, message, data) => {
  const obj = {
    type,
    id: String(++id),
    date: new Date()
  };
  if (message) obj.message = message;
  if (data) obj.data = data;
  dispatch(obj);
};
/**
 * listen to logs.
 * @param cb that is called for each future log() with the Log object
 * @return a function that can be called to unsubscribe the listener
 */


exports.log = log;

const listen = cb => {
  subscribers.push(cb);
  return () => {
    const i = subscribers.indexOf(cb);

    if (i !== -1) {
      // equivalent of subscribers.splice(i, 1) // https://twitter.com/Rich_Harris/status/1125850391155965952
      subscribers[i] = subscribers[subscribers.length - 1];
      subscribers.pop();
    }
  };
};

exports.listen = listen;

function dispatch(log) {
  for (let i = 0; i < subscribers.length; i++) {
    try {
      subscribers[i](log);
    } catch (e) {
      console.error(e);
    }
  }
} // for debug purpose


if (typeof window !== "undefined") {
  window.__ledgerLogsListen = listen;
}
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