An expression value. It will reflect the current expression state and changes if any item referred to by the expression change. One of and should be present.
array of strings
Expression errors. The error appears if the expression components change. Successfully created expressions do not have an field. A failed expression can be saved with errors, in which case both and fields are possible.
Required for typed expressions; optional, by default is empty.
Metadata of an expression. Can be of valid JSON object. If null, should not be shown.
If , the expression is a variable. Variables cannot use the collection.