/**
 * Result of scanning a list of account names for construct-key collisions.
 * `empty-construct-key` — a name normalises to "" (no alphanumeric content).
 * `duplicate-construct-key` — two names share a construct key (same account
 * case- and separator-insensitively); `existingName` is the first-seen name.
 */
export type AccountNameCollision = {
    kind: "empty-construct-key";
    name: string;
} | {
    kind: "duplicate-construct-key";
    name: string;
    existingName: string;
    constructKey: string;
};
/**
 * Scan account names for the first construct-key collision in iteration order.
 * Empty-key is checked before duplicate per element. Pure — never throws; the
 * caller decides how to surface a non-null result. Single source for the
 * collision invariant shared by getConfig (synth-time) and buildOrgConfigPayload
 * (runtime); see `accountConstructKey` for the normalisation it builds on.
 */
export declare function findAccountNameCollision(names: readonly string[]): AccountNameCollision | null;