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This is a slight re-write of the component created [here](https://lingui.js.org/guides/dynamic-loading-catalogs.html) to be a functional component and support a priority-ordered list of multiple locales.
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import React, { useCallback, useEffect, useState } from "react"; | |
import { Catalog } from "@lingui/core"; | |
import { I18nProvider } from "@lingui/react"; | |
export type I18nLoaderProps = { | |
locales: string[]; | |
}; | |
/** | |
* This component attempts to load the first available compiled message catalog for the array of passed in locales. If | |
* none are available, the children are not rendered. | |
* | |
* This is a based on the component created [here](https://lingui.js.org/guides/dynamic-loading-catalogs.html). | |
*/ | |
export const I18nLoader: React.FC<I18nLoaderProps> = (props) => { | |
const [locale, setLocale] = useState(null as string | null); | |
const [catalog, setCatalog] = useState(null as Catalog | null); | |
const loadCatalog = useCallback(async () => { | |
for (let i = 0; i < props.locales.length; i++) { | |
// Try to load the catalog for the current locale | |
try { | |
const currLocale = props.locales[i]; | |
const loadedCatalog = await import( | |
/* webpackMode: "lazy", webpackChunkName: "i18n-[index]" */ | |
`@lingui/loader!../../locales/${currLocale}/messages.po` | |
); | |
// If we found a supported locale/catalog, update the state and bail | |
if (loadedCatalog) { | |
setCatalog(loadedCatalog); | |
setLocale(currLocale); | |
return; | |
} | |
} catch (_) {} | |
} | |
}, [props.locales]); | |
useEffect(() => { | |
loadCatalog().then(); | |
}, [loadCatalog]); | |
// Skip rendering when no supported locales are available. | |
if (!locale || !catalog) return null; | |
return ( | |
<I18nProvider language={locale} catalogs={{ [locale]: catalog }}> | |
{props.children} | |
</I18nProvider> | |
); | |
}; |
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