/**
 * A plain PNG of exactly the dimensions asked for.
 *
 * Production code, not a fixture — though the fixtures use it too. **Every pass
 * must carry an icon**, and a business that has just signed up has not uploaded
 * one: without this the first pass they preview cannot be built at all, and the
 * fifteen-minute path from signing up to a poster on the counter has a wall in
 * the middle of it. A rectangle in their own colours is a poor logo and a
 * perfectly good placeholder.
 *
 * Hand-written rather than reached for: `sharp` is libvips — a native binary and
 * a hundred megabytes — and the alternative to that is a checked-in binary
 * nobody can read in a diff. Writing a solid PNG is a header, one deflated
 * scanline block and a checksum.
 */
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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