How to use the tailwindcss/defaultTheme.boxShadow function in tailwindcss

'20': '20',
      '30': '30',
      '40': '40',
      '50': '50',
    },
    customForms: {
      horizontalPadding: defaultTheme.spacing[3],
      verticalPadding: defaultTheme.spacing[2],
      lineHeight: defaultTheme.lineHeight.normal,
      fontSize: defaultTheme.fontSize.base,
      borderColor: defaultTheme.borderColor.default,
      borderWidth: defaultTheme.borderWidth.default,
      borderRadius: defaultTheme.borderRadius.default,
      backgroundColor: defaultTheme.colors.white,
      focusBorderColor: defaultTheme.colors.blue[400],
      focusBoxShadow: defaultTheme.boxShadow.outline,
      boxShadow: defaultTheme.boxShadow.none,
      checkboxSize: '1em',
      radioSize: '1em',
      checkboxIcon: `<svg xmlns="http://www.w3.org/2000/svg" fill="#fff" viewBox="0 0 16 16"><path d="M5.707 7.293a1 1 0 0 0-1.414 1.414l2 2a1 1 0 0 0 1.414 0l4-4a1 1 0 0 0-1.414-1.414L7 8.586 5.707 7.293z"></path></svg>`,
      radioIcon: `<svg xmlns="http://www.w3.org/2000/svg" fill="#fff" viewBox="0 0 16 16"><circle r="3" cy="8" cx="8"></circle></svg>`,
      checkedColor: defaultTheme.colors.blue[500],
      selectIcon: `<svg fill="${
        defaultTheme.colors.gray[500]
      }" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M15.3 9.3a1 1 0 0 1 1.4 1.4l-4 4a1 1 0 0 1-1.4 0l-4-4a1 1 0 0 1 1.4-1.4l3.3 3.29 3.3-3.3z"></path></svg>`,
      selectIconOffset: defaultTheme.spacing[2],
      selectIconSize: '1.5em',
    },
    spinner: theme =&gt; ({
      default: {
        color: '#dae1e7', // color you want to make the spinner
        size: '1em', // size of the spinner (used for both width and height)

'30': '30',
      '40': '40',
      '50': '50',
    },
    customForms: {
      horizontalPadding: defaultTheme.spacing[3],
      verticalPadding: defaultTheme.spacing[2],
      lineHeight: defaultTheme.lineHeight.normal,
      fontSize: defaultTheme.fontSize.base,
      borderColor: defaultTheme.borderColor.default,
      borderWidth: defaultTheme.borderWidth.default,
      borderRadius: defaultTheme.borderRadius.default,
      backgroundColor: defaultTheme.colors.white,
      focusBorderColor: defaultTheme.colors.blue[400],
      focusBoxShadow: defaultTheme.boxShadow.outline,
      boxShadow: defaultTheme.boxShadow.none,
      checkboxSize: '1em',
      radioSize: '1em',
      checkboxIcon: `<svg xmlns="http://www.w3.org/2000/svg" fill="#fff" viewBox="0 0 16 16"><path d="M5.707 7.293a1 1 0 0 0-1.414 1.414l2 2a1 1 0 0 0 1.414 0l4-4a1 1 0 0 0-1.414-1.414L7 8.586 5.707 7.293z"></path></svg>`,
      radioIcon: `<svg xmlns="http://www.w3.org/2000/svg" fill="#fff" viewBox="0 0 16 16"><circle r="3" cy="8" cx="8"></circle></svg>`,
      checkedColor: defaultTheme.colors.blue[500],
      selectIcon: `<svg fill="${
        defaultTheme.colors.gray[500]
      }" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M15.3 9.3a1 1 0 0 1 1.4 1.4l-4 4a1 1 0 0 1-1.4 0l-4-4a1 1 0 0 1 1.4-1.4l3.3 3.29 3.3-3.3z"></path></svg>`,
      selectIconOffset: defaultTheme.spacing[2],
      selectIconSize: '1.5em',
    },
    spinner: theme =&gt; ({
      default: {
        color: '#dae1e7', // color you want to make the spinner
        size: '1em', // size of the spinner (used for both width and height)
        border: '2px', // border-width of the spinner (shouldn't be bigger than half the spinner's size)

const defaultTheme = require('tailwindcss/defaultTheme')

module.exports = {
	theme: {
		extend: {
			backgroundColor: {
				overlay: 'rgba(0, 0, 0, 0.2)'
			},
			boxShadow: {
				'md-light': lightVariant(defaultTheme.boxShadow.md),
				'lg-light': lightVariant(defaultTheme.boxShadow.lg),
				'xl-light': lightVariant(defaultTheme.boxShadow.xl),
				'2xl-light': lightVariant(defaultTheme.boxShadow['2xl'])
			}
		}
	},
	variants: {},
	plugins: []
}

function lightVariant(value) {
	return value.replace('0, 0, 0', '255, 255, 255')
}

const defaultTheme = require('tailwindcss/defaultTheme')

module.exports = {
	theme: {
		extend: {
			backgroundColor: {
				overlay: 'rgba(0, 0, 0, 0.2)'
			},
			boxShadow: {
				'md-light': lightVariant(defaultTheme.boxShadow.md),
				'lg-light': lightVariant(defaultTheme.boxShadow.lg),
				'xl-light': lightVariant(defaultTheme.boxShadow.xl),
				'2xl-light': lightVariant(defaultTheme.boxShadow['2xl'])
			}
		}
	},
	variants: {},
	plugins: []
}

function lightVariant(value) {
	return value.replace('0, 0, 0', '255, 255, 255')
}