effect-io-ai

Package: effect
Module: Struct

Struct.Mutable

Removes readonly modifiers from all properties of an object type.

When to use

Use when you need a mutable version of a readonly interface.

Details

This helper is purely cosmetic at the type level and has no runtime effect. It also flattens intersections like Simplify.

Example (Making a readonly type mutable)

import type { Struct } from "effect"

type ReadOnly = { readonly a: string; readonly b: number }
type Writable = Struct.Mutable<ReadOnly>
// { a: string; b: number }

See

• Simplify – flattens intersections without removing readonly

Signature

type { -readonly [K in keyof T]: T[K]; } = { -readonly [K in keyof T]: T[K] } & {}

Source

Since v4.0.0