"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/** Predicates
 *
 * These predicates return true/false based on the input.
 * Although these functions are exported, they are subject to change without notice.
 *
 * @module common_predicates
 */
/** */
var hof_1 = require("./hof");
var stateObject_1 = require("../state/stateObject");
var toStr = Object.prototype.toString;
var tis = function (t) { return function (x) { return typeof x === t; }; };
exports.isUndefined = tis('undefined');
exports.isDefined = hof_1.not(exports.isUndefined);
exports.isNull = function (o) { return o === null; };
exports.isNullOrUndefined = hof_1.or(exports.isNull, exports.isUndefined);
exports.isFunction = tis('function');
exports.isNumber = tis('number');
exports.isString = tis('string');
exports.isObject = function (x) { return x !== null && typeof x === 'object'; };
exports.isArray = Array.isArray;
exports.isDate = (function (x) { return toStr.call(x) === '[object Date]'; });
exports.isRegExp = (function (x) { return toStr.call(x) === '[object RegExp]'; });
exports.isState = stateObject_1.StateObject.isState;
/**
 * Predicate which checks if a value is injectable
 *
 * A value is "injectable" if it is a function, or if it is an ng1 array-notation-style array
 * where all the elements in the array are Strings, except the last one, which is a Function
 */
function isInjectable(val) {
    if (exports.isArray(val) && val.length) {
        var head = val.slice(0, -1), tail = val.slice(-1);
        return !(head.filter(hof_1.not(exports.isString)).length || tail.filter(hof_1.not(exports.isFunction)).length);
    }
    return exports.isFunction(val);
}
exports.isInjectable = isInjectable;
/**
 * Predicate which checks if a value looks like a Promise
 *
 * It is probably a Promise if it's an object, and it has a `then` property which is a Function
 */
exports.isPromise = hof_1.and(exports.isObject, hof_1.pipe(hof_1.prop('then'), exports.isFunction));
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