Yarn build fails

[iKlsR]

Following instructions I get

$ yarn build
yarn run v1.19.1
$ PROGRESS=${PROGRESS:-true} webpack --config frontend/webpack/webpack.config.js
'PROGRESS' is not recognized as an internal or external command,
operable program or batch file.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Removing PROGRESS=${PROGRESS:-true} then I get

$ yarn build
yarn run v1.19.1
$ webpack --config frontend/webpack/webpack.config.js
Hash: 7c32ebaffa2596f62713
Version: webpack 4.41.5
Time: 2787ms
Built at: 07/30/2020 8:25:07 PM

ERROR in ../node_modules/@fortawesome/fontawesome-pro/svgs/regular/chevron-right.svg 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512"><path d="M24.707 38.101L4.908 57.899c-4.686 4.686-4.686 12.284 0 16.971L185.607 256 4.908 437.13c-4.686 4.686-4.686 12.284 0 16.971L24.707 473.9c4.686 4.686 12.284 4.686 16.971 0l209.414-209.414c4.686-4.686 4.686-12.284 0-16.971L41.678 38.101c-4.687-4.687-12.285-4.687-16.971 0z"/></svg>
 @ ./app/components/json-viewer/index.tsx 12:29-99
 @ ./app/components/object-editor/index.tsx
 @ ./app/app.tsx

ERROR in ../node_modules/@fortawesome/fontawesome-pro/svgs/regular/cross.svg 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><path d="M344 104h-64V40c0-22.06-17.94-40-40-40h-96c-22.06 0-40 17.94-40 40v64H40c-22.06 0-40 17.94-40 40v96c0 22.06 17.94 40 40 40h64v192c0 22.06 17.94 40 40 40h96c22.06 0 40-17.94 40-40V280h64c22.06 0 40-17.94 40-40v-96c0-22.06-17.94-40-40-40zm-8 128H232v232h-80V232H48v-80h104V48h80v104h104v80z"/></svg>
 @ ./app/components/json-viewer/index.tsx 13:22-84
 @ ./app/components/object-editor/index.tsx
 @ ./app/app.tsx

ERROR in ../node_modules/@fortawesome/fontawesome-pro/svgs/regular/chevron-down.svg 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M441.9 167.3l-19.8-19.8c-4.7-4.7-12.3-4.7-17 0L224 328.2 42.9 147.5c-4.7-4.7-12.3-4.7-17 0L6.1 167.3c-4.7 4.7-4.7 12.3 0 17l209.4 209.4c4.7 4.7 12.3 4.7 17 0l209.4-209.4c4.7-4.7 4.7-12.3 0-17z"/></svg>
 @ ./app/components/json-viewer/index.tsx 11:28-97
 @ ./app/components/object-editor/index.tsx
 @ ./app/app.tsx
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.