(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('apollo-utilities'), require('zen-observable-ts'), require('graphql/language/printer')) :
	typeof define === 'function' && define.amd ? define(['exports', 'apollo-utilities', 'zen-observable-ts', 'graphql/language/printer'], factory) :
	(factory((global.apolloLink = global.apolloLink || {}, global.apolloLink.core = {}),global.apollo.utilities,global.apolloLink.zenObservable,global.printer));
}(this, (function (exports,apolloUtilities,Observable,printer) { 'use strict';

Observable = Observable && Observable.hasOwnProperty('default') ? Observable['default'] : Observable;

var __extends = (undefined && undefined.__extends) || (function () {
    var extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __assign = (undefined && undefined.__assign) || Object.assign || function(t) {
    for (var s, i = 1, n = arguments.length; i < n; i++) {
        s = arguments[i];
        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
            t[p] = s[p];
    }
    return t;
};
function validateOperation(operation) {
    var OPERATION_FIELDS = [
        'query',
        'operationName',
        'variables',
        'extensions',
        'context',
    ];
    for (var _i = 0, _a = Object.keys(operation); _i < _a.length; _i++) {
        var key = _a[_i];
        if (OPERATION_FIELDS.indexOf(key) < 0) {
            throw new Error("illegal argument: " + key);
        }
    }
    return operation;
}
var LinkError = (function (_super) {
    __extends(LinkError, _super);
    function LinkError(message, link) {
        var _this = _super.call(this, message) || this;
        _this.link = link;
        return _this;
    }
    return LinkError;
}(Error));
function isTerminating(link) {
    return link.request.length <= 1;
}
function toPromise(observable) {
    var completed = false;
    return new Promise(function (resolve, reject) {
        observable.subscribe({
            next: function (data) {
                if (completed) {
                    console.warn("Promise Wrapper does not support multiple results from Observable");
                }
                else {
                    completed = true;
                    resolve(data);
                }
            },
            error: reject,
        });
    });
}
var makePromise = toPromise;
function fromPromise(promise) {
    return new Observable(function (observer) {
        promise
            .then(function (value) {
            observer.next(value);
            observer.complete();
        })
            .catch(observer.error.bind(observer));
    });
}
function fromError(errorValue) {
    return new Observable(function (observer) {
        observer.error(errorValue);
    });
}
function transformOperation(operation) {
    var transformedOperation = {
        variables: operation.variables || {},
        extensions: operation.extensions || {},
        operationName: operation.operationName,
        query: operation.query,
    };
    if (!transformedOperation.operationName) {
        transformedOperation.operationName =
            typeof transformedOperation.query !== 'string'
                ? apolloUtilities.getOperationName(transformedOperation.query)
                : '';
    }
    return transformedOperation;
}
function createOperation(starting, operation) {
    var context = __assign({}, starting);
    var setContext = function (next) {
        if (typeof next === 'function') {
            context = __assign({}, context, next(context));
        }
        else {
            context = __assign({}, context, next);
        }
    };
    var getContext = function () { return (__assign({}, context)); };
    Object.defineProperty(operation, 'setContext', {
        enumerable: false,
        value: setContext,
    });
    Object.defineProperty(operation, 'getContext', {
        enumerable: false,
        value: getContext,
    });
    Object.defineProperty(operation, 'toKey', {
        enumerable: false,
        value: function () { return getKey(operation); },
    });
    return operation;
}
function getKey(operation) {
    return printer.print(operation.query) + "|" + JSON.stringify(operation.variables) + "|" + operation.operationName;
}

var passthrough = function (op, forward) { return (forward ? forward(op) : Observable.of()); };
var toLink = function (handler) {
    return typeof handler === 'function' ? new ApolloLink(handler) : handler;
};
var empty = function () {
    return new ApolloLink(function (op, forward) { return Observable.of(); });
};
var from = function (links) {
    if (links.length === 0)
        return empty();
    return links.map(toLink).reduce(function (x, y) { return x.concat(y); });
};
var split = function (test, left, right) {
    if (right === void 0) { right = new ApolloLink(passthrough); }
    var leftLink = toLink(left);
    var rightLink = toLink(right);
    if (isTerminating(leftLink) && isTerminating(rightLink)) {
        return new ApolloLink(function (operation) {
            return test(operation)
                ? leftLink.request(operation) || Observable.of()
                : rightLink.request(operation) || Observable.of();
        });
    }
    else {
        return new ApolloLink(function (operation, forward) {
            return test(operation)
                ? leftLink.request(operation, forward) || Observable.of()
                : rightLink.request(operation, forward) || Observable.of();
        });
    }
};
var concat = function (first, second) {
    var firstLink = toLink(first);
    if (isTerminating(firstLink)) {
        console.warn(new LinkError("You are calling concat on a terminating link, which will have no effect", firstLink));
        return firstLink;
    }
    var nextLink = toLink(second);
    if (isTerminating(nextLink)) {
        return new ApolloLink(function (operation) {
            return firstLink.request(operation, function (op) { return nextLink.request(op) || Observable.of(); }) || Observable.of();
        });
    }
    else {
        return new ApolloLink(function (operation, forward) {
            return (firstLink.request(operation, function (op) {
                return nextLink.request(op, forward) || Observable.of();
            }) || Observable.of());
        });
    }
};
var ApolloLink = (function () {
    function ApolloLink(request) {
        if (request)
            this.request = request;
    }
    ApolloLink.prototype.split = function (test, left, right) {
        if (right === void 0) { right = new ApolloLink(passthrough); }
        return this.concat(split(test, left, right));
    };
    ApolloLink.prototype.concat = function (next) {
        return concat(this, next);
    };
    ApolloLink.prototype.request = function (operation, forward) {
        throw new Error('request is not implemented');
    };
    ApolloLink.empty = empty;
    ApolloLink.from = from;
    ApolloLink.split = split;
    ApolloLink.execute = execute;
    return ApolloLink;
}());
function execute(link, operation) {
    return (link.request(createOperation(operation.context, transformOperation(validateOperation(operation)))) || Observable.of());
}

exports.Observable = Observable;
exports.createOperation = createOperation;
exports.makePromise = makePromise;
exports.toPromise = toPromise;
exports.fromPromise = fromPromise;
exports.fromError = fromError;
exports.empty = empty;
exports.from = from;
exports.split = split;
exports.concat = concat;
exports.ApolloLink = ApolloLink;
exports.execute = execute;

Object.defineProperty(exports, '__esModule', { value: true });

})));
//# sourceMappingURL=bundle.umd.js.map