@material-ui/core/es/styles/createTypography.js

React components that implement Google's Material Design.

import _objectSpread from "@babel/runtime/helpers/objectSpread";
import _objectWithoutProperties from "@babel/runtime/helpers/objectWithoutProperties";
import deepmerge from 'deepmerge'; // < 1kb payload overhead when lodash/merge is > 3kb.

function round(value) {
  return Math.round(value * 1e5) / 1e5;
}

export default function createTypography(palette, typography) {
  const _ref = typeof typography === 'function' ? typography(palette) : typography,
        {
    fontFamily = '"Roboto", "Helvetica", "Arial", sans-serif',
    // The default font size of the Material Specification.
    fontSize = 14,
    // px
    fontWeightLight = 300,
    fontWeightRegular = 400,
    fontWeightMedium = 500,
    // Tell Material-UI what's the font-size on the html element.
    // 16px is the default font-size used by browsers.
    htmlFontSize = 16,
    // Apply the CSS properties to all the variants.
    allVariants
  } = _ref,
        other = _objectWithoutProperties(_ref, ["fontFamily", "fontSize", "fontWeightLight", "fontWeightRegular", "fontWeightMedium", "htmlFontSize", "allVariants"]);

  const coef = fontSize / 14;

  function pxToRem(value) {
    return `${value / htmlFontSize * coef}rem`;
  }

  return deepmerge({
    pxToRem,
    round,
    fontFamily,
    fontSize,
    fontWeightLight,
    fontWeightRegular,
    fontWeightMedium,
    display4: _objectSpread({
      fontSize: pxToRem(112),
      fontWeight: fontWeightLight,
      fontFamily,
      letterSpacing: '-.04em',
      lineHeight: `${round(128 / 112)}em`,
      marginLeft: '-.04em',
      color: palette.text.secondary
    }, allVariants),
    display3: _objectSpread({
      fontSize: pxToRem(56),
      fontWeight: fontWeightRegular,
      fontFamily,
      letterSpacing: '-.02em',
      lineHeight: `${round(73 / 56)}em`,
      marginLeft: '-.02em',
      color: palette.text.secondary
    }, allVariants),
    display2: _objectSpread({
      fontSize: pxToRem(45),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(51 / 45)}em`,
      marginLeft: '-.02em',
      color: palette.text.secondary
    }, allVariants),
    display1: _objectSpread({
      fontSize: pxToRem(34),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(41 / 34)}em`,
      color: palette.text.secondary
    }, allVariants),
    headline: _objectSpread({
      fontSize: pxToRem(24),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(32.5 / 24)}em`,
      color: palette.text.primary
    }, allVariants),
    title: _objectSpread({
      fontSize: pxToRem(21),
      fontWeight: fontWeightMedium,
      fontFamily,
      lineHeight: `${round(24.5 / 21)}em`,
      color: palette.text.primary
    }, allVariants),
    subheading: _objectSpread({
      fontSize: pxToRem(16),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(24 / 16)}em`,
      color: palette.text.primary
    }, allVariants),
    body2: _objectSpread({
      fontSize: pxToRem(14),
      fontWeight: fontWeightMedium,
      fontFamily,
      lineHeight: `${round(24 / 14)}em`,
      color: palette.text.primary
    }, allVariants),
    body1: _objectSpread({
      fontSize: pxToRem(14),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(20.5 / 14)}em`,
      color: palette.text.primary
    }, allVariants),
    caption: _objectSpread({
      fontSize: pxToRem(12),
      fontWeight: fontWeightRegular,
      fontFamily,
      lineHeight: `${round(16.5 / 12)}em`,
      color: palette.text.secondary
    }, allVariants),
    button: _objectSpread({
      fontSize: pxToRem(14),
      textTransform: 'uppercase',
      fontWeight: fontWeightMedium,
      fontFamily,
      color: palette.text.primary
    }, allVariants)
  }, other, {
    clone: false // No need to clone deep

  });
}