effect-io-ai

Package: effect
Module: Option

Option.None

Represents the absence of a value within an Option.

When to use

Use as a type guard target when narrowing via isNone

Details

• _tag is always "None"
• Implements Pipeable, Inspectable, and structural equality

See

• isNone to check if an Option is None
• none to construct a None

Signature

export interface None<out A> extends Pipeable, Inspectable {
  readonly _tag: "None"
  readonly _op: "None"
  readonly valueOrUndefined: undefined
  readonly [TypeId]: {
    readonly _A: Covariant<A>
  }
  [Symbol.iterator](): OptionIterator<Option<A>>
  [Unify.typeSymbol]?: unknown
  [Unify.unifySymbol]?: OptionUnify<this>
  [Unify.ignoreSymbol]?: OptionUnifyIgnore
}

Source

Since v2.0.0