basant307/AI_Governance_Project

1"use strict"2module.exports = require('./loader')(global, loadImplementation);3 4/**5 * Node.js version of loadImplementation.6 *7 * Requires the given implementation and returns the registration8 * containing {Promise, implementation}9 *10 * If implementation is undefined or global.Promise, loads it11 * Otherwise uses require12 */13function loadImplementation(implementation){14  var impl = null15 16  if(shouldPreferGlobalPromise(implementation)){17    // if no implementation or env specified use global.Promise18    impl = {19      Promise: global.Promise,20      implementation: 'global.Promise'21    }22  } else if(implementation){23    // if implementation specified, require it24    var lib = require(implementation)25    impl = {26      Promise: lib.Promise || lib,27      implementation: implementation28    }29  } else {30    // try to auto detect implementation. This is non-deterministic31    // and should prefer other branches, but this is our last chance32    // to load something without throwing error33    impl = tryAutoDetect()34  }35 36  if(impl === null){37    throw new Error('Cannot find any-promise implementation nor'+38      ' global.Promise. You must install polyfill or call'+39      ' require("any-promise/register") with your preferred'+40      ' implementation, e.g. require("any-promise/register/bluebird")'+41      ' on application load prior to any require("any-promise").')42  }43 44  return impl45}46 47/**48 * Determines if the global.Promise should be preferred if an implementation49 * has not been registered.50 */51function shouldPreferGlobalPromise(implementation){52  if(implementation){53    return implementation === 'global.Promise'54  } else if(typeof global.Promise !== 'undefined'){55    // Load global promise if implementation not specified56    // Versions < 0.11 did not have global Promise57    // Do not use for version < 0.12 as version 0.11 contained buggy versions58    var version = (/v(\d+)\.(\d+)\.(\d+)/).exec(process.version)59    return !(version && +version[1] == 0 && +version[2] < 12)60  }61 62  // do not have global.Promise or another implementation was specified63  return false64}65 66/**67 * Look for common libs as last resort there is no guarantee that68 * this will return a desired implementation or even be deterministic.69 * The priority is also nearly arbitrary. We are only doing this70 * for older versions of Node.js <0.12 that do not have a reasonable71 * global.Promise implementation and we the user has not registered72 * the preference. This preserves the behavior of any-promise <= 0.173 * and may be deprecated or removed in the future74 */75function tryAutoDetect(){76  var libs = [77      "es6-promise",78      "promise",79      "native-promise-only",80      "bluebird",81      "rsvp",82      "when",83      "q",84      "pinkie",85      "lie",86      "vow"]87  var i = 0, len = libs.length88  for(; i < len; i++){89    try {90      return loadImplementation(libs[i])91    } catch(e){}92  }93  return null94}95