// @flow

type DynamicStructure = {
    [string]: number
}

const key: string = "someKey"
const someStructure: DynamicStructure = {
    [key]: "invalid, should be a number"
}

// @flow

type DynamicStructure = {
    [string]: number
}

const someStructure: DynamicStructure = {
    "someKey": "invalid, should be a number"
}