reactotron-core-client/dist/commonjs/stopwatch.js

Grants Reactotron clients the ability to talk to a Reactotron server.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.start = void 0;
/// <reference types="node" />

const hasHirezNodeTimer = false && typeof process === "object" && process && process.hrtime && typeof process.hrtime === "function";

// the default timer
// eslint-disable-next-line @typescript-eslint/no-unused-vars
const defaultPerformanceNow = started => Date.now();

// try to find the browser-based performance timer
const nativePerformance = typeof window !== "undefined" && window && (window.performance || window.msPerformance || window.webkitPerformance);

// the function we're trying to assign
let performanceNow = defaultPerformanceNow;

// accepts an already started time and returns the number of milliseconds
let delta = started => performanceNow() - started;
if (hasHirezNodeTimer) {
  performanceNow = process.hrtime;
  delta = started => performanceNow(started)[1] / 1000000;
} else if (global.nativePerformanceNow) {
  // react native 47
  performanceNow = global.nativePerformanceNow;
} else if (nativePerformance) {
  // browsers + safely check for react native < 47
  performanceNow = () => nativePerformance.now && nativePerformance.now();
}

/**
 * Starts a lame, low-res timer.  Returns a function which when invoked,
 * gives you the number of milliseconds since passing.  ish.
 */
const start = () => {
  //  record the start time
  const started = performanceNow();
  return () => delta(started);
};
exports.start = start;
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