[v10] feat: support sass embedded

[mistic]

When trying to update the sass engine from the legacy node-sass into the new ones we found that users using webpack v4 doesn't have the ability to use the new sass-embedded implementation as the sass-loader version that supports it doesn't work with webpack v4. This is a good addition because using the javascript sass only implementation has big performance penalties.

[linux-foundation-easycla]

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• ✅ login: mistic / name: Tiago Costa (0053aa9)

[alexander-akait]

Release will be tomorrow, thank you

[mistic]

Thank you @alexander-akait !

[mistic]

@alexander-akait are we going to release this today? 😃

[sebbayer]

@mistic I think the part about sass-embedded is missing in the try/catch block of getDefaultSassImplementation in src/utils.js. Otherwise it will never check if that package is installed. Taken from branch master:

  try {
    require.resolve("sass");
  } catch (ignoreError) {
    try {
      require.resolve("node-sass");
      sassImplPkg = "node-sass";
    } catch (_ignoreError) {
      try {
        require.resolve("sass-embedded");
        sassImplPkg = "sass-embedded";
      } catch (__ignoreError) {
        sassImplPkg = "sass";
      }
    }
  }

When I only install latest sass-embedded with sass-loader 10.5.0 in my project, I get the error:

Cannot find module 'sass'
Require stack:

• node_modules/sass-loader/dist/utils.js
  ...

[mistic]

@sebbayer you're right, I've missed that part. Fix at #1170