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编辑当前文件:/home/freeclou/app.optimyar.com/backend/node_modules/global-cache/index.js

'use strict';

var define = require('define-properties');
var isSymbol = require('is-symbol');

var globalKey = '__ global cache key __';
/* istanbul ignore else */
// eslint-disable-next-line no-restricted-properties
if (typeof Symbol === 'function' && isSymbol(Symbol('foo')) && typeof Symbol['for'] === 'function') {
	// eslint-disable-next-line no-restricted-properties
	globalKey = Symbol['for'](globalKey);
}

var trueThunk = function () {
	return true;
};

var cache = ensureCache();

var isPrimitive = function isPrimitive(val) {
	return val === null || (typeof val !== 'object' && typeof val !== 'function');
};

var getPrimitiveKey = function getPrimitiveKey(val) {
	if (isSymbol(val)) {
		return Symbol.prototype.valueOf.call(val);
	}
	return typeof val + ' | ' + String(val);
};

var requirePrimitiveKey = function requirePrimitiveKey(val) {
	if (!isPrimitive(val)) {
		throw new TypeError('key must not be an object');
	}
};

var globalCache = {
	clear: function clear() {
		delete global[globalKey];
		cache = ensureCache();
	},

'delete': function deleteKey(key) {
		requirePrimitiveKey(key);
		delete cache[getPrimitiveKey(key)];
		return !globalCache.has(key);
	},

get: function get(key) {
		requirePrimitiveKey(key);
		return cache[getPrimitiveKey(key)];
	},

has: function has(key) {
		requirePrimitiveKey(key);
		return getPrimitiveKey(key) in cache;
	},

set: function set(key, value) {
		requirePrimitiveKey(key);
		var primitiveKey = getPrimitiveKey(key);
		var props = {};
		props[primitiveKey] = value;
		var predicates = {};
		predicates[primitiveKey] = trueThunk;
		define(cache, props, predicates);
		return globalCache.has(key);
	},

setIfMissingThenGet: function setIfMissingThenGet(key, valueThunk) {
		if (globalCache.has(key)) {
			return globalCache.get(key);
		}
		var item = valueThunk();
		globalCache.set(key, item);
		return item;
	}
};

module.exports = globalCache;