instanceof.js
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instanceof.js
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			'use strict';

			var CONSTRUCTORS = {
			Object: Object,
			Array: Array,
			Function: Function,
			Number: Number,
			String: String,
			Date: Date,
			RegExp: RegExp
			};

			module.exports = function defFunc(ajv) {
			/* istanbul ignore else */
			if (typeof Buffer != 'undefined')
			CONSTRUCTORS.Buffer = Buffer;

			/* istanbul ignore else */
			if (typeof Promise != 'undefined')
			CONSTRUCTORS.Promise = Promise;

			defFunc.definition = {
			compile: function (schema) {
			if (typeof schema == 'string') {
			var Constructor = getConstructor(schema);
			return function (data) {
			return data instanceof Constructor;
			};
			}

			var constructors = schema.map(getConstructor);
			return function (data) {
			for (var i=0; i<constructors.length; i++)
			if (data instanceof constructors[i]) return true;
			return false;
			};
			},
			CONSTRUCTORS: CONSTRUCTORS,
			metaSchema: {
			anyOf: [
			{ type: 'string' },
			{
			type: 'array',
			items: { type: 'string' }
			}
			]
			}
			};

			ajv.addKeyword('instanceof', defFunc.definition);
			return ajv;

			function getConstructor(c) {
			var Constructor = CONSTRUCTORS[c];
			if (Constructor) return Constructor;
			throw new Error('invalid "instanceof" keyword value ' + c);
			}
			};