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import i18next, {
Modules,
BackendModule,
LanguageDetectorModule,
LoggerModule,
I18nFormatModule,
ThirdPartyModule,
} from 'i18next';
// declare modules in a way that the `type` is not widened
// @see https://github.com/microsoft/TypeScript/issues/20271#issuecomment-347020203
const backendModule: BackendModule = {
type: 'backend',
init: () => null,
read: (_language, _namespace, callback) => {
callback(null, {
key: 'value',
});
},
create: () => null,
readMulti: (_languages, _namespaces, callback) => {
callback(null, {
en: {
namespace: {
key: 'value',
},
},
});
},
save: () => null,
};
const languageDetectorModule: LanguageDetectorModule = {
type: 'languageDetector',
init: () => null,
detect: () => '',
cacheUserLanguage: () => null,
};
const loggerModule: LoggerModule = {
type: 'logger',
log: () => null,
warn: () => null,
error: () => null,
};
const i18nFormatModule: I18nFormatModule = {
type: 'i18nFormat',
};
const thirdPartyModule: ThirdPartyModule = {
type: '3rdParty',
init: () => null,
};
const externalModules = [thirdPartyModule];
const modules: Modules = {
backend: backendModule,
languageDetector: languageDetectorModule,
i18nFormat: i18nFormatModule,
logger: loggerModule,
external: externalModules,
};
i18next.use(backendModule);
i18next.use(languageDetectorModule);
i18next.use(loggerModule);
i18next.use(i18nFormatModule);
i18next.use(externalModules);
// exercise class usage
class MyLoggerModule implements LoggerModule {
type: 'logger' = 'logger';
log = () => null;
warn = () => null;
error = () => null;
}
i18next.use(MyLoggerModule);
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