export type WhenComparisonOperator = '>=' | '<=' | '!=' | '==' | '>' | '<';
export type WhenOperandExpression = {
    kind: 'literal';
    raw: string;
    value: boolean | number | string | null;
} | {
    kind: 'state';
    reference: string;
} | {
    kind: 'item';
    reference: string;
};
type WhenContainsExpression = {
    kind: 'contains';
    listExpression: Extract<WhenOperandExpression, {
        kind: 'state' | 'item';
    }>;
    valueExpression: WhenOperandExpression;
};
type WhenExistsPredicateExpression = {
    kind: 'comparison';
    left: WhenOperandExpression;
    right: WhenOperandExpression;
} | WhenContainsExpression;
export type WhenClauseExpression = {
    kind: 'boolean';
    value: boolean;
} | {
    kind: 'operand';
    operand: Extract<WhenOperandExpression, {
        kind: 'state';
    }>;
} | {
    kind: 'comparison';
    operator: WhenComparisonOperator;
    left: WhenOperandExpression;
    right: WhenOperandExpression;
} | {
    kind: 'exists';
    listExpression: Extract<WhenOperandExpression, {
        kind: 'state';
    }>;
    predicate: WhenExistsPredicateExpression[];
} | WhenContainsExpression;
export interface WhenConditionExpression {
    alternatives: WhenClauseExpression[][];
}
export declare function parseWhenConditionExpression(expression: string): WhenConditionExpression;
export {};
//# sourceMappingURL=workflow-when-expression.d.ts.map