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TypeScript
1234567891011121314151617181920212223export type ImageMimeType = "image/png" | "image/jpeg" | "image/webp"export type ImageMetadata = { mimeType: ImageMimeType; width: number; height: number; bytes: number }export type ImageAttachment = ImageMetadata & { data: string }
const MIME_TYPES = new Set<ImageMimeType>(["image/png", "image/jpeg", "image/webp"])
export function parseImageMetadata(value: unknown): ImageMetadata | undefined { if (!value || typeof value !== "object") return const image = value as Partial<ImageMetadata> if (!MIME_TYPES.has(image.mimeType as ImageMimeType) || !Number.isSafeInteger(image.width) || !Number.isSafeInteger(image.height) || !Number.isSafeInteger(image.bytes) || (image.width ?? 0) < 1 || (image.width ?? 0) > 16_384 || (image.height ?? 0) < 1 || (image.height ?? 0) > 16_384 || (image.width ?? 0) * (image.height ?? 0) > 40_000_000 || (image.bytes ?? 0) < 1 || (image.bytes ?? 0) > 5 * 1024 * 1024) return return image as ImageMetadata}
export const imageLabel = ({ mimeType, width, height, bytes }: ImageMetadata): string => { const size = bytes >= 1024 * 1024 ? `${(bytes / 1024 / 1024).toFixed(1)} MB` : bytes >= 1024 ? `${Math.ceil(bytes / 1024)} KB` : `${bytes} B` return `${mimeType.slice(6).toUpperCase()} ${width}×${height} · ${size}`}