Tailwind v2 and Sage 9

@knowler Thank you for putting this together. I followed your install instructions and everything has worked fine so far except when defining fonts in my main.scss I get the following error.

Module build failed: ModuleBuildError: Module build failed: TypeError [ERR_INVALID_ARG_TYPE]: The "from" argument must be of type string. Received undefined

I’m using @font-face in main.scss the same as I have in previous Sage projects:

@font-face {
  font-family: "Raleway";
  src: url("../fonts/Raleway-VariableFont_wght.ttf");
  font-weight: 100 900;
  font-style: normal;
}

If I remove my @font-face rule then build works with no errors.

In my package.json I have:

 "devDependencies": {
    "autoprefixer": "^10.0.1",
    "browser-sync": "^2.26.13",
    "browsersync-webpack-plugin": "^0.6.0",
    "bs-html-injector": "~3.0",
    "buble-loader": "^0.4.1",
    "cache-loader": "~1.2.5",
    "clean-webpack-plugin": "^0.1.18",
    "copy-globs-webpack-plugin": "^0.2.0",
    "css-loader": "^0.28.11",
    "cssnano": "^4.0.5",
    "eslint": "~4.19.1",
    "eslint-loader": "^4.0.2",
    "eslint-plugin-import": "^2.14.0",
    "extract-text-webpack-plugin": "~3.0.2",
    "file-loader": "^6.2.0",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "imagemin-mozjpeg": "^9.0.0",
    "imagemin-webpack-plugin": "^2.4.2",
    "import-glob": "~1.5",
    "node-sass": "^5.0.0",
    "postcss": "^8.2.1",
    "postcss-loader": "^4.0.4",
    "postcss-safe-parser": "^5.0.2",
    "resolve-url-loader": "^3.1.2",
    "rimraf": "^3.0.2",
    "sass-loader": "~6.0.7",
    "style-loader": "^0.23.1",
    "stylelint": "^13.7.2",
    "stylelint-config-standard": "^20.0.0",
    "stylelint-webpack-plugin": "^0.10.5",
    "tailwindcss": "^2.0.1",
    "uglifyjs-webpack-plugin": "^1.3.0",
    "url-loader": "^4.1.1",
    "webpack": "~3.10.0",
    "webpack-assets-manifest": "^1.0.0",
    "webpack-dev-middleware": "~2.0.4",
    "webpack-hot-middleware": "^2.22.3",
    "webpack-merge": "~4.1.4",
    "yargs": "^16.1.0"
  },

Has anyone else had this issue? Thanks in advance for any help or suggestions.