fix: output.publicPath validation is too strict (#93)

closes #88

Author: nlarche

src/properties/output/index.js

@@ -4,7 +4,10 @@ import { notAbsolutePath, absolutePath, urlPart } from '../../types'
 export default Joi.object({
   filename: notAbsolutePath,
   path: absolutePath,
-  publicPath: urlPart,
+  publicPath: Joi.alternatives().try([
+    urlPart,
+    Joi.string().valid(''),
+  ]),
   chunkFilename: notAbsolutePath,
   sourceMapFilename: notAbsolutePath,
   devtoolModuleFilenameTemplate: [notAbsolutePath, Joi.func()],

src/properties/output/index.test.js

@@ -39,7 +39,8 @@ const validModuleConfigs = [
   { crossOriginLoading: 'anonymous' },
   // #17
   { hashDigestLength: 6 }, // undocumented
-
+  // #18
+  { publicPath: '' },
 ]
 
 const invalidModuleConfigs = [