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/**
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 * Increase string a value with unit
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 *
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 * @example '2px' + 1 = '3px'
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 * @example '15em' + (-2) = '13em'
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 */
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export function increaseWithUnit(target: number, delta: number): number
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export function increaseWithUnit(target: string, delta: number): string
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export function increaseWithUnit(target: string | number, delta: number): string | number
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export function increaseWithUnit(target: string | number, delta: number): string | number {
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  if (typeof target === 'number')
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    return target + delta
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  const value = target.match(/^-?[0-9]+\.?[0-9]*/)?.[0] || ''
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  const unit = target.slice(value.length)
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  const result = (parseFloat(value) + delta)
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  if (Number.isNaN(result))
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    return target
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  return result + unit
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}