/**
 * WHO A MARK IS OF, and the hue that follows. Private: a chosen hue is a category nobody can act
 * on; a stated colour is a `Status` or `Chip`.
 */
/**
 * A mark's colour is data (`constitution.md` §8's exception). Eight families that stay apart in
 * hue, measured pairwise in `identity_hue.test.ts`. Red is excluded: a person is not a warning.
 * Hash mod 8 makes order arbitrary, so replace a family in place.
 */
export declare const IDENTITY_FAMILIES: readonly ["cyan", "orange", "green", "teal", "blue", "indigo", "violet", "pink"];
export type IdentityFamily = (typeof IDENTITY_FAMILIES)[number];
/**
 * The name, else the sign-in identity. Blank where neither is known, dealt no family
 * (`memberDisplayName` prints the word). A function because four hand-spelled fallbacks disagreed.
 */
export declare function identityKey(name?: string | null, identity?: string | null): string;
/**
 * `undefined` without a key, keeping the neutral ground. NFC and case-folded, so composed and
 * decomposed Vietnamese or a capitalised retyping are one person.
 */
export declare function identityFamily(key: string): IdentityFamily | undefined;