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+'use strict';
+
+/**
+ * Cache results of the first function call to ensure only calling once.
+ *
+ * ```js
+ * var utils = require('lazy-cache')(require);
+ * // cache the call to `require('ansi-yellow')`
+ * utils('ansi-yellow', 'yellow');
+ * // use `ansi-yellow`
+ * console.log(utils.yellow('this is yellow'));
+ * ```
+ *
+ * @param {Function} `fn` Function that will be called only once.
+ * @return {Function} Function that can be called to get the cached function
+ * @api public
+ */
+
+function lazyCache(fn) {
+ var cache = {};
+ var proxy = function(mod, name) {
+ name = name || camelcase(mod);
+
+ // check both boolean and string in case `process.env` cases to string
+ if (process.env.UNLAZY === 'true' || process.env.UNLAZY === true || process.env.TRAVIS) {
+ cache[name] = fn(mod);
+ }
+
+ Object.defineProperty(proxy, name, {
+ enumerable: true,
+ configurable: true,
+ get: getter
+ });
+
+ function getter() {
+ if (cache.hasOwnProperty(name)) {
+ return cache[name];
+ }
+ return (cache[name] = fn(mod));
+ }
+ return getter;
+ };
+ return proxy;
+}
+
+/**
+ * Used to camelcase the name to be stored on the `lazy` object.
+ *
+ * @param {String} `str` String containing `_`, `.`, `-` or whitespace that will be camelcased.
+ * @return {String} camelcased string.
+ */
+
+function camelcase(str) {
+ if (str.length === 1) {
+ return str.toLowerCase();
+ }
+ str = str.replace(/^[\W_]+|[\W_]+$/g, '').toLowerCase();
+ return str.replace(/[\W_]+(\w|$)/g, function(_, ch) {
+ return ch.toUpperCase();
+ });
+}
+
+/**
+ * Expose `lazyCache`
+ */
+
+module.exports = lazyCache;