My application receives a list of supported locales from the backend in the following response:
{locales: [{code: 'enUS'}, {code: 'deDE'}, {code: 'arAR'}]}
I plan to utilize the date-fns library for date formatting, but I need to import the entire date-fns/locale as I cannot predict which locale will be required in advance:
import * as dateFnsLocales from 'date-fns/locale';
The issue arises when some locales use different code formats. For example, German language support is indicated by 'deDE' in the backend response, but the corresponding date-fns package uses just 'de'. Conversely, the English package is 'enUS', not just 'en'.
An easy solution would involve using a coalescing operator. Here's an example:
import * as dateFnsLocales from 'date-fns/locale';
const supportedLocales = {locales: [{code: 'enUS'}, {code: 'deDE'}, {code: 'plPL'}]}
const newArrayWithSupportedLocales = supportedLocales.locales.map((locale) => ({
...locale,
dateFnsLocale: (dateFnsLocales[locale.code] || dateFnsLocales[locale.code.substring(0,2)]),
}));
However, I encounter a TypeScript error:
No index signature with a parameter of type 'string' was found on type 'typeof import("date-fns/locale")'. TS7053Even if I try hardcoded attempts like:
dateFnsLocale: dateFnsLocales['plPL'.substring(0,2)]
it still fails with the same error, despite this working fine:
dateFnsLocale: dateFnsLocales['pl']
This challenge requires further exploration for resolution.