@enhancedjs/css-in-template-string-loader

It is a webpack loader that extracts CSS and SASS code from JavaScript or TypeScript template strings. It allows to write single file components in standard JavaScript and TypeScript source files.

Example

Add template strings with scss, sass or css tags:

// a-source-file.js
// … Some JavaScript code …

scss`
section {
  background-color: #234;
}
`

// … Some JavaScript code …

This webpack loader will remove the template string at compile time, so it is unecessary to provide an implementation for the template tag. But, in a TypeScript project, a declaration has to be provided:

// global.d.ts
declare function scss(text: TemplateStringsArray): void
declare function sass(text: TemplateStringsArray): void
declare function css(text: TemplateStringsArray): void

How to configure

First, install @enhancedjs/css-in-template-string-loader in your application:

npm install @enhancedjs/css-in-template-string-loader --save-dev

Add it in your webpack configuration. Here is an example of configuration for JavaScript source files that uses SCSS template strings:

// webpack.config.js
module.exports = {
  // …
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: [
          {
            loader: "@enhancedjs/css-in-template-string-loader",
            options: {
              cssLoaders: [
                "style-loader", // Or: MiniCssExtractPlugin.loader
                "css-loader",
                "sass-loader"
              ]
            }
          }
        ],
      },
    ]
  }
}

For TypeScript source files, it is the same configuration but with ts-loader:

// webpack.config.js
module.exports = {
  // …
  module: {
    rules: [
      {
        test: /\.ts$/,
        exclude: /node_modules/,
        use: [
          "ts-loader",
          {
            loader: "@enhancedjs/css-in-template-string-loader",
            options: {
              cssLoaders: [
                "style-loader", // Or: MiniCssExtractPlugin.loader
                "css-loader",
                "sass-loader"
              ]
            }
          },
        ]
      },
    ]
  }
}

Here is how to configure the loader with Vue.js:

// vue.config.js
const MiniCssExtractPlugin = require("mini-css-extract-plugin") // Notice: installed by Vue CLI

module.exports = {
  configureWebpack: config => ({
    module: {
      rules: [
        {
          test: /\.(js|ts)$/,
          exclude: /node_modules/,
          use: [
            {
              loader: "@enhancedjs/vue-template-in-string-loader",
            },
            {
              loader: "@enhancedjs/css-in-template-string-loader",
              options: {
                cssLoaders: [
                  config.mode === "development" ? "vue-style-loader" : MiniCssExtractPlugin.loader,
                  "css-loader",
                  "sass-loader",
                ],
              },
            },
          ],
        },
      ],
    },
  }),
}

Notice: For performance reasons, it is recommanded to always put @enhancedjs/css-in-template-string-loader at the last position.

See also

• The Visual Studio Code plugin enhancedjs.sass-in-template-string.

Contribute

With VS Code, our recommanded plugin is:

• TSLint from Microsoft (ms-vscode.vscode-typescript-tslint-plugin)