The field's current expression source, or null/undefined
when unset (the editor opens empty).
Autocomplete context (see ExpressionEditorDialogOptions).
The edited expression string on Save, null to clear the field, or
undefined if the dialog was cancelled or dismissed.
Open the SafeExpression editor for a formula-field value.
A popup with a CodeMirror editor — grammar-aware syntax highlighting and helper/identifier autocomplete — plus live validation against the real SafeExpression grammar (the same jsep parse + allowlist the runtime uses — see SafeExpression.validateSource) and a click-to-insert palette of the registered helper functions (expressionHelpers). Save is disabled while the expression is invalid, so the dialog can only ever return a valid expression. Clear returns the empty value; Cancel returns nothing.