/**
 * The message of an unknown caught value. `catch` hands back `unknown`, and this ternary was
 * spelled out at over twenty call sites; the next variation in one of them would be a bug (a
 * dropped `String()` turns a thrown string into `[object Object]`'s sibling problems), so the
 * idiom gets one home. Node-free, exported through /client for the dashboard's use too.
 */
export declare function errorMessage(err: unknown): string;
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