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export function map<T, U>(  fn: (value: T, index: number) => U, strings: TemplateStringsArray, ...values: T[]): [strings: TemplateStringsArray, ...values: U[]]export function map<T, U>(  fn: (value: T, index: number) => U): (  strings: TemplateStringsArray, ...values: T[]) => [strings: TemplateStringsArray, ...values: U[]]export function map<T, U>(...args:| [fn: (value: T, index: number) => U]| [    fn: (value: T, index: number) => U  , strings: TemplateStringsArray  , ...values: T[]  ]) {  if (args.length === 1) {    const [fn] = args as [fn: (value: T, index: number) => U]
    return (      strings: TemplateStringsArray    , ...values: T[]    ): [strings: TemplateStringsArray, ...values: U[]] => {      return map(fn, strings, ...values)    }  } else {    const [fn, strings, ...values] = args as [      fn: (value: T, index: number) => U    , strings: TemplateStringsArray    , ...values: T[]    ]
    const newValues = values.map((x, i) => fn(x, i))
    return [strings, ...newValues]  }}