first

node_modules/core-js/internals/async-iterator-create-proxy.js

@@ -0,0 +1,105 @@
+'use strict';
+var call = require('../internals/function-call');
+var perform = require('../internals/perform');
+var anObject = require('../internals/an-object');
+var create = require('../internals/object-create');
+var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
+var defineBuiltIns = require('../internals/define-built-ins');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+var InternalStateModule = require('../internals/internal-state');
+var getBuiltIn = require('../internals/get-built-in');
+var getMethod = require('../internals/get-method');
+var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
+var createIterResultObject = require('../internals/create-iter-result-object');
+var iteratorClose = require('../internals/iterator-close');
+
+var Promise = getBuiltIn('Promise');
+
+var TO_STRING_TAG = wellKnownSymbol('toStringTag');
+var ASYNC_ITERATOR_HELPER = 'AsyncIteratorHelper';
+var WRAP_FOR_VALID_ASYNC_ITERATOR = 'WrapForValidAsyncIterator';
+var setInternalState = InternalStateModule.set;
+
+var createAsyncIteratorProxyPrototype = function (IS_ITERATOR) {
+  var IS_GENERATOR = !IS_ITERATOR;
+  var getInternalState = InternalStateModule.getterFor(IS_ITERATOR ? WRAP_FOR_VALID_ASYNC_ITERATOR : ASYNC_ITERATOR_HELPER);
+
+  var getStateOrEarlyExit = function (that) {
+    var stateCompletion = perform(function () {
+      return getInternalState(that);
+    });
+
+    var stateError = stateCompletion.error;
+    var state = stateCompletion.value;
+
+    if (stateError || (IS_GENERATOR && state.done)) {
+      return { exit: true, value: stateError ? Promise.reject(state) : Promise.resolve(createIterResultObject(undefined, true)) };
+    } return { exit: false, value: state };
+  };
+
+  return defineBuiltIns(create(AsyncIteratorPrototype), {
+    next: function next() {
+      var stateCompletion = getStateOrEarlyExit(this);
+      var state = stateCompletion.value;
+      if (stateCompletion.exit) return state;
+      var handlerCompletion = perform(function () {
+        return anObject(state.nextHandler(Promise));
+      });
+      var handlerError = handlerCompletion.error;
+      var value = handlerCompletion.value;
+      if (handlerError) state.done = true;
+      return handlerError ? Promise.reject(value) : Promise.resolve(value);
+    },
+    'return': function () {
+      var stateCompletion = getStateOrEarlyExit(this);
+      var state = stateCompletion.value;
+      if (stateCompletion.exit) return state;
+      state.done = true;
+      var iterator = state.iterator;
+      var returnMethod, result;
+      var completion = perform(function () {
+        if (state.inner) try {
+          iteratorClose(state.inner.iterator, 'normal');
+        } catch (error) {
+          return iteratorClose(iterator, 'throw', error);
+        }
+        return getMethod(iterator, 'return');
+      });
+      returnMethod = result = completion.value;
+      if (completion.error) return Promise.reject(result);
+      if (returnMethod === undefined) return Promise.resolve(createIterResultObject(undefined, true));
+      completion = perform(function () {
+        return call(returnMethod, iterator);
+      });
+      result = completion.value;
+      if (completion.error) return Promise.reject(result);
+      return IS_ITERATOR ? Promise.resolve(result) : Promise.resolve(result).then(function (resolved) {
+        anObject(resolved);
+        return createIterResultObject(undefined, true);
+      });
+    }
+  });
+};
+
+var WrapForValidAsyncIteratorPrototype = createAsyncIteratorProxyPrototype(true);
+var AsyncIteratorHelperPrototype = createAsyncIteratorProxyPrototype(false);
+
+createNonEnumerableProperty(AsyncIteratorHelperPrototype, TO_STRING_TAG, 'Async Iterator Helper');
+
+module.exports = function (nextHandler, IS_ITERATOR) {
+  var AsyncIteratorProxy = function AsyncIterator(record, state) {
+    if (state) {
+      state.iterator = record.iterator;
+      state.next = record.next;
+    } else state = record;
+    state.type = IS_ITERATOR ? WRAP_FOR_VALID_ASYNC_ITERATOR : ASYNC_ITERATOR_HELPER;
+    state.nextHandler = nextHandler;
+    state.counter = 0;
+    state.done = false;
+    setInternalState(this, state);
+  };
+
+  AsyncIteratorProxy.prototype = IS_ITERATOR ? WrapForValidAsyncIteratorPrototype : AsyncIteratorHelperPrototype;
+
+  return AsyncIteratorProxy;
+};