chore: output blank css files to avoid broken builds (#1724)

packages/netlify-cms/package.json

@@ -45,6 +45,7 @@
     "netlify-cms-widget-text": "^2.0.5"
   },
   "devDependencies": {
+    "copy-webpack-plugin": "^4.5.2",
     "cross-env": "^5.2.0",
     "friendly-errors-webpack-plugin": "^1.7.0",
     "webpack": "^4.16.1",

packages/netlify-cms/shims/cms.css

@@ -0,0 +1,5 @@
+/**
+ * Netlify CMS 2.0 moved from static CSS to CSS-in-JS. Some site builds are configured to look
+ * for `cms.css`, and will break when it's missing, so we're putting out this blank file to help.
+ * We'll eventually remove it, so please update your build to not require it.
+ */

packages/netlify-cms/webpack.config.js

@@ -1,6 +1,7 @@
 const path = require('path');
 const webpack = require('webpack');
 const FriendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
 const pkg = require('./package.json');
 const { plugins } = require('../../scripts/webpack');
 const coreWebpackConfig = require('../netlify-cms-core/webpack.config.js');
@@ -24,6 +25,7 @@ const baseConfig = {
         messages: ['Netlify CMS is now running at http://localhost:8080'],
       },
     }),
+    new CopyWebpackPlugin([{ from: '../shims/cms.css', to: 'dist/' }]),
   ],
   devServer: {
     contentBase: '../../dev-test',
@@ -44,7 +46,7 @@ if (isProduction) {
      */
     {
       ...baseConfig,
-      entry: [path.join(__dirname, 'scripts/deprecate-old-dist.js'), baseConfig.entry],
+      entry: [path.join(__dirname, 'shims/deprecate-old-dist.js'), baseConfig.entry],
       output: {
         ...baseConfig.output,
         filename: 'dist/cms.js',

yarn.lock

@@ -2550,6 +2550,19 @@ copy-descriptor@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/copy-descriptor/-/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
 
+copy-webpack-plugin@^4.5.2:
+  version "4.5.2"
+  resolved "https://registry.yarnpkg.com/copy-webpack-plugin/-/copy-webpack-plugin-4.5.2.tgz#d53444a8fea2912d806e78937390ddd7e632ee5c"
+  dependencies:
+    cacache "^10.0.4"
+    find-cache-dir "^1.0.0"
+    globby "^7.1.1"
+    is-glob "^4.0.0"
+    loader-utils "^1.1.0"
+    minimatch "^3.0.4"
+    p-limit "^1.0.0"
+    serialize-javascript "^1.4.0"
+
 core-js@^1.0.0:
   version "1.2.7"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-1.2.7.tgz#652294c14651db28fa93bd2d5ff2983a4f08c636"
@@ -4258,6 +4271,17 @@ globby@^6.1.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
+globby@^7.1.1:
+  version "7.1.1"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-7.1.1.tgz#fb2ccff9401f8600945dfada97440cca972b8680"
+  dependencies:
+    array-union "^1.0.1"
+    dir-glob "^2.0.0"
+    glob "^7.1.2"
+    ignore "^3.3.5"
+    pify "^3.0.0"
+    slash "^1.0.0"
+
 globby@^8.0.0:
   version "8.0.1"
   resolved "https://registry.yarnpkg.com/globby/-/globby-8.0.1.tgz#b5ad48b8aa80b35b814fc1281ecc851f1d2b5b50"
@@ -6941,7 +6965,7 @@ p-finally@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
 
-p-limit@^1.1.0:
+p-limit@^1.0.0, p-limit@^1.1.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.3.0.tgz#b86bd5f0c25690911c7590fcbfc2010d54b3ccb8"
   dependencies: