export type ValidCelExpression = string & {
    readonly __validCelExpression: unique symbol;
};
export interface WorkflowExpression {
    language: 'cel';
    source: ValidCelExpression;
    check: WorkflowExpressionCheck;
    resultType?: ExpressionType;
}
export type WorkflowExpressionCheck = 'syntax' | 'typed';
export type ExpressionScalarType = 'string' | 'int' | 'double' | 'bool' | 'null' | 'timestamp';
export type ExpressionType = ExpressionScalarType | {
    kind: 'dyn';
} | {
    kind: 'object';
    fields: Readonly<Record<string, ExpressionType>>;
} | {
    kind: 'map';
} | {
    kind: 'list';
    element: ExpressionType;
};
export type ExpressionTypeEnvironment = Readonly<Record<string, ExpressionType>>;
export type WorkflowExpressionCheckOptions = {
    mode: 'syntax';
} | {
    mode: 'typed';
    typeEnvironment?: ExpressionTypeEnvironment;
    expectedResultType?: ExpressionScalarType;
};
export interface CreateWorkflowExpressionParams {
    source: string;
    check: WorkflowExpressionCheckOptions;
}
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