Add support for .json files

[uside]

By default it handles $locales/en.ts import, reads contents of en.json file and precompile it on the fly. Live reload supported too.

svelte.config.js:

precompileIntl('src/locales', '$locales')

__layout.svelte:

import en from '$locales/en.ts';

src/locales/en.json:

{"foot": "Test {count} {count, plural, =1 {foot} other {feet}}"}

[cibernox]

Thank you so much for this. I'll test this tomorrow on a project. However something we'd need is to handle both TS and JS files for this to be useful for a much people as possible.

[cibernox]

I just tested and it works perfectly!

Just a couple more requests.

• Can you annotate the code so it's clear what's going on? For instance I'm not sure what the configureServer part is doing.
• Can you please update the readme making clear that users should import from $locales/en.js instead of ../../locales/en.js? Although relative imports continue to work for javascript files, which is awesome because that means this improvement is not breaking.
• Off topic question: I did notice that the code reads the file synchronously, but I wondered something. In Big Corp™ apps I've had before the situation where locales are not available in your machine but served by a separate service. Would with this architecture be possible for vite's server to, when receiving a request for a given locale file, fetch it asynchronously from a service, transform it on the fly with my babel plugin and send it to the client (and probably cache it so next request doesn't have to do all this)? That would be awesome because it's a situation where precompiling the locale was not possible.

[uside]

I can add third argument for plugin initialization that receives event emitter with async load method

const BigCorpLocales = new EventEmitter();
BigCorpLocales.load = async (localeCode) => {
  return asyncLoadLocaleFromService(localeCode);
};
BigCorpLocales.emit('change', 'en');

precompileIntl('src/locales', '$locales', BigCorpLocales);

[cibernox]

Let's keep it focused on the Jason thing, but I think it could be usefulin the future

[cibernox]

Thanks! I'll release a new minor version