expo-image/build/utils/resolveSources.js

A cross-platform, performant image component for React Native and Expo with Web support

import resolveAssetSource from './resolveAssetSource';
import { resolveBlurhashString, resolveThumbhashString } from './resolveHashString';
export function isBlurhashString(str) {
    return /^(blurhash:\/)+[\w#$%*+,\-.:;=?@[\]^_{}|~]+(\/[\d.]+)*$/.test(str);
}
// Base64 strings will be recognized as blurhash by default (to keep compatibility),
// interpret as thumbhash only if correct uri scheme is provided
export function isThumbhashString(str) {
    return str.startsWith('thumbhash:/');
}
function resolveSource(source) {
    if (typeof source === 'string') {
        if (isBlurhashString(source)) {
            return resolveBlurhashString(source);
        }
        else if (isThumbhashString(source)) {
            return resolveThumbhashString(source);
        }
        return { uri: source };
    }
    if (typeof source === 'number') {
        return resolveAssetSource(source);
    }
    if (typeof source === 'object' && (source?.blurhash || source?.thumbhash)) {
        const { blurhash, thumbhash, ...restSource } = source;
        const resolved = thumbhash
            ? resolveThumbhashString(thumbhash)
            : resolveBlurhashString(blurhash);
        return {
            ...resolved,
            ...restSource,
        };
    }
    return source ?? null;
}
/**
 * Resolves provided `source` prop to an array of objects expected by the native implementation.
 */
export function resolveSources(sources) {
    if (Array.isArray(sources)) {
        return sources.map(resolveSource).filter(Boolean);
    }
    return [resolveSource(sources)].filter(Boolean);
}
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