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

React components that implement Google's Material Design.

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

import warning from 'warning';

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

var caseAllCaps = {
  textTransform: 'uppercase'
};
var defaultFontFamily = '"Roboto", "Helvetica", "Arial", sans-serif';
/**
 * @see @link{https://material.io/design/typography/the-type-system.html}
 * @see @link{https://material.io/design/typography/understanding-typography.html}
 */

export default function createTypography(palette, typography) {
  var _ref = typeof typography === 'function' ? typography(palette) : typography,
      _ref$fontFamily = _ref.fontFamily,
      fontFamily = _ref$fontFamily === void 0 ? defaultFontFamily : _ref$fontFamily,
      _ref$fontSize = _ref.fontSize,
      fontSize = _ref$fontSize === void 0 ? 14 : _ref$fontSize,
      _ref$fontWeightLight = _ref.fontWeightLight,
      fontWeightLight = _ref$fontWeightLight === void 0 ? 300 : _ref$fontWeightLight,
      _ref$fontWeightRegula = _ref.fontWeightRegular,
      fontWeightRegular = _ref$fontWeightRegula === void 0 ? 400 : _ref$fontWeightRegula,
      _ref$fontWeightMedium = _ref.fontWeightMedium,
      fontWeightMedium = _ref$fontWeightMedium === void 0 ? 500 : _ref$fontWeightMedium,
      _ref$fontWeightBold = _ref.fontWeightBold,
      fontWeightBold = _ref$fontWeightBold === void 0 ? 700 : _ref$fontWeightBold,
      _ref$htmlFontSize = _ref.htmlFontSize,
      htmlFontSize = _ref$htmlFontSize === void 0 ? 16 : _ref$htmlFontSize,
      allVariants = _ref.allVariants,
      other = _objectWithoutProperties(_ref, ["fontFamily", "fontSize", "fontWeightLight", "fontWeightRegular", "fontWeightMedium", "fontWeightBold", "htmlFontSize", "allVariants"]);

  process.env.NODE_ENV !== "production" ? warning(typeof fontSize === 'number', "Material-UI: 'fontSize' is required to be a number.") : void 0;
  process.env.NODE_ENV !== "production" ? warning(typeof htmlFontSize === 'number', "Material-UI: 'htmlFontSize' is required to be a number.") : void 0;
  var coef = fontSize / 14;

  var pxToRem = function pxToRem(size) {
    return "".concat(size / htmlFontSize * coef, "rem");
  };

  var buildVariant = function buildVariant(fontWeight, size, lineHeight, letterSpacing, casing) {
    return _extends({
      fontFamily: fontFamily,
      fontWeight: fontWeight,
      fontSize: pxToRem(size),
      // Unitless following https://meyerweb.com/eric/thoughts/2006/02/08/unitless-line-heights/
      lineHeight: lineHeight
    }, fontFamily === defaultFontFamily ? {
      letterSpacing: "".concat(round(letterSpacing / size), "em")
    } : {}, {}, casing, {}, allVariants);
  };

  var variants = {
    h1: buildVariant(fontWeightLight, 96, 1, -1.5),
    h2: buildVariant(fontWeightLight, 60, 1, -0.5),
    h3: buildVariant(fontWeightRegular, 48, 1.04, 0),
    h4: buildVariant(fontWeightRegular, 34, 1.17, 0.25),
    h5: buildVariant(fontWeightRegular, 24, 1.33, 0),
    h6: buildVariant(fontWeightMedium, 20, 1.6, 0.15),
    subtitle1: buildVariant(fontWeightRegular, 16, 1.75, 0.15),
    subtitle2: buildVariant(fontWeightMedium, 14, 1.57, 0.1),
    body1: buildVariant(fontWeightRegular, 16, 1.5, 0.15),
    body2: buildVariant(fontWeightRegular, 14, 1.43, 0.15),
    button: buildVariant(fontWeightMedium, 14, 1.75, 0.4, caseAllCaps),
    caption: buildVariant(fontWeightRegular, 12, 1.66, 0.4),
    overline: buildVariant(fontWeightRegular, 12, 2.66, 1, caseAllCaps)
  };
  return deepmerge(_extends({
    htmlFontSize: htmlFontSize,
    pxToRem: pxToRem,
    round: round,
    fontFamily: fontFamily,
    fontSize: fontSize,
    fontWeightLight: fontWeightLight,
    fontWeightRegular: fontWeightRegular,
    fontWeightMedium: fontWeightMedium,
    fontWeightBold: fontWeightBold
  }, variants), other, {
    clone: false // No need to clone deep

  });
}