ExpressionEditorType
Coarse Expression Editor category used by options such as
expressionEditorButtons: scalar covers per-row editors (including boolean);
aggregated covers aggregated editors; observable is the Observable
Calculated Column editor (a per-row editor with observable-first chrome —
same function pool as scalar).
TypeScript
export type ExpressionEditorType = 'scalar' | 'aggregated' | 'cumulative' | 'quantile' | 'window' | 'observable';