/**
 * A real PNG of exactly the dimensions asked for.
 *
 * Every pass fixture needs images, and every image rule in this package is about
 * *size* — an `@2x` that is not exactly twice its base, a logo wider than the
 * layout allows. A one-pixel placeholder cannot exercise any of that, and a
 * checked-in binary of each size is a directory of files nobody can read in a
 * diff.
 *
 * So the fixtures are generated. Small enough to be free — a solid colour
 * deflates to almost nothing — and honest enough that `readPngSize`, and any
 * other decoder, agrees with the number that was asked for.
 */
export declare function solidPng(width: number, height: number, colour?: {
    r: number;
    g: number;
    b: number;
}): Buffer;
/** A stable digest of an image, for a test that wants to say "the same one". */
export declare const fingerprint: (bytes: Uint8Array) => string;
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