next/dist/esm/shared/lib/normalized-asset-prefix.js

The React Framework

export function normalizedAssetPrefix(assetPrefix) {
    // remove all leading slashes and trailing slashes
    const escapedAssetPrefix = assetPrefix?.replace(/^\/+|\/+$/g, '') || false;
    // if an assetPrefix was '/', we return empty string
    // because it could be an unnecessary trailing slash
    if (!escapedAssetPrefix) {
        return '';
    }
    if (URL.canParse(escapedAssetPrefix)) {
        const url = new URL(escapedAssetPrefix).toString();
        return url.endsWith('/') ? url.slice(0, -1) : url;
    }
    // assuming assetPrefix here is a pathname-style,
    // restore the leading slash
    return `/${escapedAssetPrefix}`;
}

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