effect-io-ai

Package: effect
Module: SchemaIssue

SchemaIssue.MissingKey

Represents a schema issue produced when a required key or tuple index is missing from the input.

When to use

Use when you need to detect absent fields in struct/tuple validation.

Details

• Has no actual value — getActual returns Option.none().
• annotations may contain a custom messageMissingKey for formatting.

See

• Pointer — wraps this issue with the missing key’s path
• UnexpectedKey — the opposite case (extra key present)

Signature

declare class MissingKey { constructor(
    /**
     * The metadata for the issue.
     */
    annotations: Schema.Annotations.Key<unknown> | undefined
  ) }

Source

Since v4.0.0