ExpressionEvaluationResult

Result envelope of every synchronous expressionApi.evaluate* / filter* call.

Evaluation failures are expected input errors (expression typos, unknown columns, missing row target, unavailable functions), so the API never throws — check success and read value / errorMessage accordingly.

export type ExpressionEvaluationResult<T> = {
    success: true;
    value: T;
} | {
    success: false;
    errorMessage: string;
};