Gatsby.js - Typography.js

Question

自从安装typography.js以来，我得到了这个错误：

error There was an error compiling the html.js component for the development server.

  14 |   // Create family + styles string
  15 |   var fontsStr = '';
> 16 |   if (props.typography.options.googleFonts) {
     | ^
  17 |     var fonts = props.typography.options.googleFonts.map(function (font) {
  18 |       var str = '';
  19 |       str += font.name.split(' ').join('+');

  WebpackError: Cannot read property 'googleFonts' of undefined

  - GoogleFont.js:16 GoogleFont
    ~/react-typography/dist/GoogleFont.js:16:1
...

我不确定这是什么意思，也不知道如何修复它。我正在使用Gatsby.js默认的初学者包

typography.js这样做：

import Typography from "typography";

const typography = new Typography({
  baseFontSize: "18px",
  baseLineHeight: 1.45,
  headerFontFamily: [
    "Avenir Next",
    "Helvetica Neue",
    "Segoe UI",
    "Helvetica",
    "Arial",
    "sans-serif",
  ],
  bodyFontFamily: ["Georgia", "serif"],
});

和gatsby-config.js：

module.exports = {
  siteMetadata: {
    title: `Gatsby Default Starter`
  },
  plugins: [
    `gatsby-plugin-react-helmet`,
    `gatsby-plugin-styled-components`,
    {
      resolve: `gatsby-plugin-typography`, 
      options: {
        pathToConfigModule: 'src/utilities/typography.js'
      },
    },
  ]
};