Optionalscope?: stringId of the sohl.entity.expr.ExpressionScope declaring which
identifiers this field's expression may use (e.g. "skill.base") —
the scope the value will be evaluated against at its call site.
Drives the editor's autocomplete and its live out-of-scope check, and
reaches the sheet as data-expr-scope via the expressionField
partial. Resolved eagerly at construction, so an unknown or renamed id
throws while the schema is being built rather than yielding a field
that silently validates nothing.
Optional: omit it only when the field has no single fixed call site — an expression stored without a scope accepts any identifier.
Construction options: every foundry.data.fields.StringField option —
required,nullable,blank,trim,initial,choices,label,hint,validate,readonly, … — plusscope, the only one this field adds.The options are inherited by intersection rather than re-declared, so the base set never drifts from Foundry's. Four of them carry different defaults here (
nullable,blank,trim,initial); see the table on SafeExpressionField for those and when overriding is reasonable.