How to use the @carbon/layout.px function in @carbon/layout

lineHeight: '119%',
  letterSpacing: 0,
  breakpoints: {
    md: {
      fontSize: rem(scale[13]),
      lineHeight: '115%',
    },
    lg: {
      fontSize: rem(scale[16]),
      lineHeight: '111%',
      letterSpacing: px(-0.64),
    },
    xlg: {
      fontSize: rem(scale[19]),
      lineHeight: '107%',
      letterSpacing: px(-0.64),
    },
    max: {
      fontSize: rem(scale[22]),
      lineHeight: '105%',
      letterSpacing: px(-0.96),
    },
  },
};

};

export const code01 = {
  fontFamily: fontFamilies.mono,
  fontSize: rem(scale[0]),
  fontWeight: fontWeights.regular,
  lineHeight: rem(16),
  letterSpacing: px(0.32),
};

export const code02 = {
  fontFamily: fontFamilies.mono,
  fontSize: rem(scale[1]),
  fontWeight: fontWeights.regular,
  lineHeight: rem(20),
  letterSpacing: px(0.32),
};

export const heading01 = {
  fontSize: rem(scale[1]),
  fontWeight: fontWeights.semibold,
  lineHeight: rem(18),
  letterSpacing: px(0.16),
};

export const productiveHeading01 = heading01;

export const heading02 = {
  fontSize: rem(scale[2]),
  fontWeight: fontWeights.semibold,
  lineHeight: rem(22),
  letterSpacing: 0,

fontWeight: fontWeights.regular,
  lineHeight: rem(16),
  letterSpacing: px(0.32),
};

export const helperText01 = {
  fontSize: rem(scale[0]),
  lineHeight: rem(16),
  letterSpacing: px(0.32),
};

export const bodyShort01 = {
  fontSize: rem(scale[1]),
  fontWeight: fontWeights.regular,
  lineHeight: rem(18),
  letterSpacing: px(0.16),
};

export const bodyLong01 = {
  fontSize: rem(scale[1]),
  fontWeight: fontWeights.regular,
  lineHeight: rem(20),
  letterSpacing: px(0.16),
};

export const bodyShort02 = {
  fontSize: rem(scale[2]),
  fontWeight: fontWeights.regular,
  lineHeight: rem(22),
  letterSpacing: 0,
};

/**
 * Copyright IBM Corp. 2018, 2018
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

import { baseFontSize, px } from '@carbon/layout';
import { fontFamilies } from './fontFamily';
import { fontWeights } from './fontWeight';

export const reset = {
  html: {
    fontSize: px(baseFontSize),
  },
  body: {
    fontFamily: fontFamilies.sans,
    fontWeight: fontWeights.regular,
    textRendering: 'optimizeLegibility',
    '-webkit-font-smoothing': 'antialiased',
    '-moz-osx-font-smoothing': 'grayscale',
  },
  strong: {
    fontWeight: fontWeights.semibold,
  },
  code: {
    fontFamily: fontFamilies.mono,
  },
};