made dart sass default

index.js

@@ -1,3 +1,6 @@
+/* eslint-disable global-require */
+/* eslint-disable import/no-extraneous-dependencies */
+
 const chalk = require('chalk');
 const PluginError = require('plugin-error');
 const replaceExtension = require('replace-ext');
@@ -163,6 +166,18 @@ gulpSass.logError = function logError(error) {
 // ////////////////////////////
 // Store compiler in a prop
 // ////////////////////////////
-gulpSass.compiler = require('node-sass');
+gulpSass.compiler = (() => {
+  try {
+    // eslint-disable-next-line global-require import/no-extraneous-dependencies
+    return require('sass');
+  } catch (e1) {
+    try {
+      // eslint-disable-next-line global-require import/no-extraneous-dependencies
+      return require('node-sass');
+    } catch (e2) {
+      throw new Error(`${PLUGIN_NAME}: you need either sass or node-sass module in your project`);
+    }
+  }
+})();
 
 module.exports = gulpSass;

test/main.js

@@ -3,6 +3,7 @@ const Vinyl = require('vinyl');
 const path = require('path');
 const fs = require('fs');
 const sass = require('../index');
+sass.compiler = require('node-sass');
 const rimraf = require('rimraf');
 const gulp = require('gulp');
 const sourcemaps = require('gulp-sourcemaps');