External pipeline Gulp/libsass uses Ruby Sass and causes errors

#1

I am using the external_pipeline with MM via Gulp.

activate :external_pipeline,
  name: :gulp_pipeline,
  command: build? ?
  'node_modules/gulp/bin/gulp.js build' :
  'node_modules/gulp/bin/gulp.js dev',
  source: ".tmp/dist",
  latency: 1

Gulp sass task is pretty straight forward…

gulp.task('sass', function() {
  gulp.src(config.sassPath + '/all.scss')
    .pipe(sass({
      includePaths: [config.nodePath],
      errLogToConsole: true
    }))
    .pipe(gulp.dest(config.destFolder));
});

Because I want to @imports *.css into my *.scss file, I use libSass. libSass allows you to @import *.css files into *.scss by leaving off the extension. Ruby Sass won’t allow this and throws an error (if you leave the *.css extension on, Ruby Sass will copy over the @import statement, not concatenate the file into the *.scss file). I am doing with bootstrap file below…

//pulling file from node_modules
@import "node_modules/bootstrap/dist/css/bootstrap";
//pulling file from local stylesheets folder
@import "./mixins";

Running middleman build seems spin off the gulp build process and correctly build the *.scss file correctly (the build/all.scss is ok).

But, there in build/stylesheets/all there is an error file.

/*
Error: File to import not found or unreadable: node_modules/bootstrap/dist/css/bootstrap.
        on line 1 of /Users/me/Code/TrailMaker/source/stylesheets/all.scss

1: @import "node_modules/bootstrap/dist/css/bootstrap";
2: @import "node_modules/medium-editor/dist/css/medium-editor";
3: @import "node_modules/medium-editor/dist/css/themes/Beagle";
4: @import "node_modules/react-toggle/style";
5: 
6: @import "./mixins";

Backtrace:
/Users/me/Code/TrailMaker/source/stylesheets/all.scss:1
/Users/me/.rvm/gems/ruby-2.1.7/gems/sass-3.4.22/lib/sass/tree/import_node.rb:67:in `rescue in import'
/Users/me/.rvm/gems/ruby-2.1.7/gems/sass-3.4.22/lib/sass/tree/import_node.rb:45:in `import'
/Users/me/.rvm/gems/ruby-2.1.7/gems/sass-3.4.22/lib/sass/tree/import_node.rb:28:in `imported_file'

While libSass seems to build the file correctly, it also seems that Ruby Sass is also having a go at @import statements and is failing?