The value a filter predicate (see makeFilter) may return.

Details

Each shape is normalized into an SchemaIssue.Issue (or undefined for success) before being attached to the parse result:

• undefined: success. The input satisfies the filter.
• true: success. Equivalent to undefined, useful when the predicate is a plain boolean expression.
• false: generic failure. Produces an SchemaIssue.InvalidValue wrapping the input, with no custom message.
• FilterIssue: a single failure. See FilterIssue for the shapes (string, SchemaIssue.Issue, or { path, issue }).
• ReadonlyArray<FilterIssue>: several failures reported together. An empty array is treated as success; a single-element array is equivalent to returning that element directly; otherwise the entries are grouped into an SchemaIssue.Composite.