Using both Traced SVGs and WebP with gatsby-contentful-source

14 Sep 2020

gatsby-contentful-source supports Traced SVGs and WebP, by using either GatsbyContentfulFluid_tracedSVG or GatsbyContentfulFluid_withWebp, but you have to choose between one or the other. Fortunately is not that difficult to add a fragment query this allows having both.

1. Define a Fragment With Both Traced SVG and WebP

Create a file with shared query fragments, e.g. fragments.ts. Just make sure that Contentful can see the file. Mat Clutter has more information about Using GraphQL fragments across multiple templates in GatsbyJS.

import { graphql } from "gatsby"

// The name of this constant isn't important.
export const tracedSvgAndWithWebp = graphql`
  fragment GatsbyContentfulFluid_tracedSvg_withWebp on ContentfulFluid {
    tracedSVG
    aspectRatio
    src
    srcSet
    srcWebp
    srcSetWebp
    sizes
  }
`

2. Use the New Fragment

Replace your exiting fragments with new GatsbyContentfulFluid_tracedSvg_withWebp, e.g.

export const imageQuery = graphql`
  image {
    fluid(maxWidth: 1680, maxHeight: 1050) {
      ...GatsbyContentfulFluid_tracedSvg_withWebp
    }
    description
  }
`

Build Your Own Fragment

The fragments that gatsby-contentful-source comes with are all defined in their fragments.js file. GatsbyContentfulFluid_tracedSvg_withWebp is a combination of GatsbyContentfulFluid_tracedSVG and GatsbyContentfulFluid_withWebp.