update styles scripts to generate sep stylesheets for ie and modern

Author: aulneau

scripts/postcss.js

@@ -30,7 +30,7 @@ const internetExplorerPostCSS = () => {
     autoprefixer({browsers: ['ie 11']}),
     cssnano,
   ];
-  fs.readFile(`${BUILD_ENV}/react-plotly.js-editor.css`, (err, css) => {
+  fs.readFile(`${BUILD_ENV}/${fileName}.ie.css`, (err, css) => {
     postcss([...ie11_plugins])
       .process(css, {
         from: dist,

scripts/styles.js

@@ -8,7 +8,10 @@ const BUILD_ENV = process.env.BUILD_ENV || 'lib';
 
 const src = 'src/styles/main.scss';
 const fileName = `react-plotly.js-editor`;
-const dist = `${BUILD_ENV}/${fileName}.css`;
+const dist =
+  SASS_ENV === 'ie'
+    ? `${BUILD_ENV}/${fileName}.ie.css`
+    : `${BUILD_ENV}/${fileName}.css`;
 
 /**
  * Compile our scss to css!