# All files / shorthands borderRadius.js

100% Statements 7/7
100% Branches 12/12
100% Functions 1/1
100% Lines 6/6

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44

    7x
    5x
    2x

    3x
    2x

    1x

     // @flow

    /**
     * The border-radius shorthand accepts a value for side and a value for radius and applies the radius value to both corners of the side.
     * @example
     * // Styles as object usage
     * const styles = {
     *   ...borderRadius('top', '5px')
     * }
     *
     * // styled-components usage
     * const div = styled.div`
     *   ${borderRadius('top', '5px')}
     * `
     *
     * // CSS as JS Output
     *
     * div {
     *   'border-top-right-radius': '5px',
     *   'border-top-left-radius': '5px',
     * }
     */

    function borderRadius(side:string, radius:string) {
      if (!radius || typeof radius !== 'string') throw new Error('borderRadius expects a radius value as a string as the second argument.')
      if (side === 'top' || side === 'bottom') {
        return {
          [`border-${side}-right-radius`]: radius,
          [`border-${side}-left-radius`]: radius,
        }
      }

      if (side === 'left' || side === 'right') {
        return {
          [`border-top-${side}-radius`]: radius,
          [`border-bottom-${side}-radius`]: radius,
        }
      }

      throw new Error('borderRadius expects one of "top", "bottom", "left" or "right" as the first argument.')
    }

    export default borderRadius