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rOACCT/node_modules/ajv/lib/compile/async.js
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async.js
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			'use strict';

			var MissingRefError = require('./error_classes').MissingRef;

			module.exports = compileAsync;


			/**
			* Creates validating function for passed schema with asynchronous loading of missing schemas.
			* `loadSchema` option should be a function that accepts schema uri and returns promise that resolves with the schema.
			* @this Ajv
			* @param {Object} schema schema object
			* @param {Boolean} meta optional true to compile meta-schema; this parameter can be skipped
			* @param {Function} callback an optional node-style callback, it is called with 2 parameters: error (or null) and validating function.
			* @return {Promise} promise that resolves with a validating function.
			*/
			function compileAsync(schema, meta, callback) {
			/* eslint no-shadow: 0 */
			/* global Promise */
			/* jshint validthis: true */
			var self = this;
			if (typeof this._opts.loadSchema != 'function')
			throw new Error('options.loadSchema should be a function');

			if (typeof meta == 'function') {
			callback = meta;
			meta = undefined;
			}

			var p = loadMetaSchemaOf(schema).then(function () {
			var schemaObj = self._addSchema(schema, undefined, meta);
			return schemaObj.validate \|\| _compileAsync(schemaObj);
			});

			if (callback) {
			p.then(
			function(v) { callback(null, v); },
			callback
			);
			}

			return p;


			function loadMetaSchemaOf(sch) {
			var $schema = sch.$schema;
			return $schema && !self.getSchema($schema)
			? compileAsync.call(self, { $ref: $schema }, true)
			: Promise.resolve();
			}


			function _compileAsync(schemaObj) {
			try { return self._compile(schemaObj); }
			catch(e) {
			if (e instanceof MissingRefError) return loadMissingSchema(e);
			throw e;
			}


			function loadMissingSchema(e) {
			var ref = e.missingSchema;
			if (added(ref)) throw new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved');

			var schemaPromise = self._loadingSchemas[ref];
			if (!schemaPromise) {
			schemaPromise = self._loadingSchemas[ref] = self._opts.loadSchema(ref);
			schemaPromise.then(removePromise, removePromise);
			}

			return schemaPromise.then(function (sch) {
			if (!added(ref)) {
			return loadMetaSchemaOf(sch).then(function () {
			if (!added(ref)) self.addSchema(sch, ref, undefined, meta);
			});
			}
			}).then(function() {
			return _compileAsync(schemaObj);
			});

			function removePromise() {
			delete self._loadingSchemas[ref];
			}

			function added(ref) {
			return self._refs[ref] \|\| self._schemas[ref];
			}
			}
			}
			}