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backend/node_modules/any-promise/register-shim.js

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+"use strict";
+module.exports = require('./loader')(window, loadImplementation)
+
+/**
+ * Browser specific loadImplementation.  Always uses `window.Promise`
+ *
+ * To register a custom implementation, must register with `Promise` option.
+ */
+function loadImplementation(){
+  if(typeof window.Promise === 'undefined'){
+    throw new Error("any-promise browser requires a polyfill or explicit registration"+
+      " e.g: require('any-promise/register/bluebird')")
+  }
+  return {
+    Promise: window.Promise,
+    implementation: 'window.Promise'
+  }
+}