/** A single Zeebe I/O mapping entry — a FEEL `source` copied to/from a process
 *  variable `target`. */
export interface HumanIoEntry {
    /** FEEL expression evaluated for the mapping (e.g. `=orderId`). */
    source: string;
    /** The process variable the value is written to. */
    target: string;
}
/** A `<zeebe:ioMapping>`: input mappings applied on activation and output
 *  mappings applied on completion. */
export interface HumanIoMapping {
    input?: HumanIoEntry[];
    output?: HumanIoEntry[];
}
/** A present, non-empty, non-whitespace-only string — the shape every id /
 *  assignment / mapping-expression field must have. A blank value would emit a
 *  meaningless BPMN attribute (an empty ioMapping source/target, formId,
 *  assignee, …) that fails or misbehaves at deploy/run time, so we fail fast at
 *  build. Non-blank values are kept verbatim — FEEL expressions are never
 *  trimmed or normalized. */
export declare function isNonBlankString(v: unknown): v is string;
/** Validate an optional io mapping at authoring time. `label` is the node's
 *  self-description (e.g. `human("decide")` or `task("record")`) so the thrown
 *  message names the offending step. An `undefined` mapping is allowed (no
 *  ioMapping is emitted); a non-object / array value, or a malformed entry, fails
 *  fast. */
export declare function assertIoMapping(label: string, io: HumanIoMapping | undefined): void;
/** Emit a single `<zeebe:ioMapping>` (inputs then outputs) for the mapping, or
 *  the empty string when it has no entries. The 8-space element / 10-space entry
 *  indentation matches both the user-task and service-task emission, so a caller
 *  can splice the result straight into either `<bpmn:extensionElements>`. */
export declare function renderIoMapping(io: HumanIoMapping | undefined): string;