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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/expo-font/src/FontHooks.ts |
import { useEffect, useState } from 'react';
import { loadAsync, isLoaded } from './Font';
import { FontSource } from './Font.types';
function isMapLoaded(map: string | Record<string, FontSource>) {
if (typeof map === 'string') {
return isLoaded(map);
} else {
return Object.keys(map).every((fontFamily) => isLoaded(fontFamily));
}
}
function useRuntimeFonts(map: string | Record<string, FontSource>): [boolean, Error | null] {
const [loaded, setLoaded] = useState(
// For web rehydration, we need to check if the fonts are already loaded during the static render.
// Native will also benefit from this optimization.
isMapLoaded(map)
);
const [error, setError] = useState<Error | null>(null);
useEffect(() => {
loadAsync(map)
.then(() => setLoaded(true))
.catch(setError);
}, []);
return [loaded, error];
}
function useStaticFonts(map: string | Record<string, FontSource>): [boolean, Error | null] {
loadAsync(map);
return [true, null];
}
// @needsAudit
/**
* ```ts
* const [loaded, error] = useFonts({ ... });
* ```
* Load a map of fonts with [`loadAsync`](#loadasyncfontfamilyorfontmap-source). This returns a `boolean` if the fonts are
* loaded and ready to use. It also returns an error if something went wrong, to use in development.
*
* > Note, the fonts are not "reloaded" when you dynamically change the font map.
*
* @param map A map of `fontFamily`s to [`FontSource`](#fontsource)s. After loading the font you can
* use the key in the `fontFamily` style prop of a `Text` element.
*
* @return
* - __loaded__ (`boolean`) - A boolean to detect if the font for `fontFamily` has finished
* loading.
* - __error__ (`Error | null`) - An error encountered when loading the fonts.
*/
export const useFonts: (map: string | Record<string, FontSource>) => [boolean, Error | null] =
typeof window === 'undefined' ? useStaticFonts : useRuntimeFonts;
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