feat(babel): Add option to switch between the two decorator modes.

Author: danez

bin/react-docgen.js

@@ -45,6 +45,10 @@ argv
     '--legacy-decorators',
     'Enable parsing of legacy decorators proposal. By default only the new decorators syntax will be parsable.'
   )
+  .option(
+    '--decorators-before-export',
+    'Switches the decorators proposal to allow decorators before the export statement. By default this is false.'
+  )
   .option(
     '-i, --ignore <path>',
     'Folders to ignore. Default: ' + JSON.stringify(defaultIgnore),
@@ -111,6 +115,7 @@ if (argv.resolver) {
 function parse(source) {
   return parser.parse(source, resolver, null, {
     legacyDecorators: argv.legacyDecorators,
+    decoratorsBeforeExport: argv.decoratorsBeforeExport,
   });
 }
 

package.json

@@ -36,7 +36,7 @@
   "author": "Felix Kling",
   "license": "BSD-3-Clause",
   "dependencies": {
-    "@babel/parser": "^7.0.0",
+    "@babel/parser": "^7.1.3",
     "async": "^2.1.4",
     "babel-runtime": "^6.9.2",
     "commander": "^2.9.0",

src/babelParser.js

@@ -43,6 +43,7 @@ const babelParserOptions = {
 
 export type Options = {
   legacyDecorators?: boolean,
+  decoratorsBeforeExport?: boolean,
 };
 
 function buildOptions(options?: Options = {}) {
@@ -55,7 +56,7 @@ function buildOptions(options?: Options = {}) {
   } else {
     parserOptions.plugins.push([
       'decorators',
-      { decoratorsBeforeExport: false },
+      { decoratorsBeforeExport: options.decoratorsBeforeExport || false },
     ]);
   }