8         this.locale = opts.locale || 'en';
23         if (!this.cache[this.locale])
26         if (!this.cache[this.locale][str] && this.updateFiles) {
27             this.cache[this.locale][str] = str;
33                 locale: this.locale,  property
40         return shim.format.apply(shim.format, [this.cache[this.locale][str] || str].concat(args));
50         if (!this.cache[this.locale])
53         if (this.cache[this.locale][singular]) {
54             const entry = this.cache[this.locale][singular];
58         if (!this.cache[this.locale][singular] && this.updateFiles) {
59             this.cache[this.locale][singular] = {
68                 locale: this.locale,  property
82     setLocale(locale) {  argument
83         this.locale = locale;
86         return this.locale;
89         if (!this.cache[this.locale])
93                 this.cache[this.locale][key] = obj[key];
118         const locale = work.locale;
120         const languageFile = this._resolveLocaleFile(directory, locale);
121         const serializedLocale = JSON.stringify(this.cache[locale], null, 2);
131         const languageFile = this._resolveLocaleFile(this.directory, this.locale);
147         this.cache[this.locale] = localeLookup;
149     _resolveLocaleFile(directory, locale) {  argument
150         let file = shim.resolve(directory, './', locale + '.json');
151         if (this.fallbackToLanguage && !this._fileExistsSync(file) && ~locale.lastIndexOf('_')) {
153             const languageFile = shim.resolve(directory, './', locale.split('_')[0] + '.json');
172         locale: y18n.locale