typebox/docs/values/mutate.md

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Mutate

Use the Mutate function to perform a deep mutable value assignment while retaining internal references.

const Y = { z: 1 }; // const Y = { z: 1 }
const X = { y: Y }; // const X = { y: { z: 1 } }
const A = { x: X }; // const A = { x: { y: { z: 1 } } }

Value.Mutate(A, { x: { y: { z: 2 } } }); // A' = { x: { y: { z: 2 } } }

const R0 = A.x.y.z === 2; // const R0 = true
const R1 = A.x.y === Y; // const R1 = true
const R2 = A.x === X; // const R2 = true

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