/**
 * Field validation for the favicon upload: Google rejects favicons under 48×48,
 * so warn the editor at save time if the uploaded icon is too small or not
 * square. This ENFORCES the requirement instead of silently shipping a favicon
 * Google won't display.
 *
 * Attach to the favicon field's validate (or as a beforeValidate hook on the
 * Media relationship). Non-blocking by default — returns a warning string that
 * Payload surfaces; make it throw if you want a hard block.
 *
 * Note: dimensions come from the related Media doc (Payload stores width/height
 * for image uploads), so this checks the resolved upload, not the raw file.
 */ export const validateFaviconField = async ({ req, value })=>{
    if (!value) {
        return value;
    } // no favicon set → nothing to validate (optional field)
    try {
        const media = await req.payload.findByID({
            id: typeof value === 'object' ? value.id : value,
            collection: 'media',
            depth: 0
        });
        const width = media.width;
        const height = media.height;
        const mimeType = media.mimeType;
        // SVG scales infinitely — skip size checks.
        if (mimeType === 'image/svg+xml') {
            return value;
        }
        if (typeof width === 'number' && typeof height === 'number') {
            if (width < 48 || height < 48) {
                req.payload.logger.warn(`[ipal] Favicon is ${width}×${height}px. Google requires ≥48×48 to ` + `display it in search results. Upload a larger square icon (96 or 192px).`);
            }
            if (width !== height) {
                req.payload.logger.warn(`[ipal] Favicon is not square (${width}×${height}). Use a square icon ` + `so it isn't cropped in the browser tab or search results.`);
            }
        }
    } catch  {
    // Media lookup failed — don't block the save over a validation warning.
    }
    return value;
};

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