'How change object property value typescript?

interface State {
    customerId: number,
    step: string
}

const data: State = {
    step: 'shipping',
    customerId: 123
}

const setData = (key: string, value: number) => {
    data[key] = value
}

setData('customerId', 555)

Im try change value of customerId but got error: No index signature with a parameter of type 'string' was found on type 'State'.

How i can set new value?

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'How change object property value typescript?

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