adds --extensions=jsx,js by default (#239)

It seems common enough that we should allow it. Also folks use .js with typescript sometimes.

Author: Sunil Pai

bin/__tests__/react-codemod-test.js

@@ -99,7 +99,7 @@ describe('runTransform', () => {
     });
     expect(console.log).toBeCalledWith(
       // eslint-disable-next-line max-len
-      `Executing command: jscodeshift --verbose=2 --ignore-pattern=**/node_modules/** --parser flow --transform ${path.join(
+      `Executing command: jscodeshift --verbose=2 --ignore-pattern=**/node_modules/** --parser flow --extensions=jsx,js --transform ${path.join(
         transformerDirectory,
         'rename-unsafe-xyz.js'
       )} src`
@@ -117,7 +117,7 @@ describe('runTransform', () => {
     });
     expect(console.log).toBeCalledWith(
       // eslint-disable-next-line max-len
-      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser flow --transform ${path.join(
+      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser flow --extensions=jsx,js --transform ${path.join(
         transformerDirectory,
         'rename-unsafe-lifecycles.js'
       )} folder`
@@ -135,7 +135,7 @@ describe('runTransform', () => {
     });
     expect(console.log).toBeCalledWith(
       // eslint-disable-next-line max-len
-      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser tsx --extensions=tsx,ts --transform ${path.join(
+      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser tsx --extensions=tsx,ts,jsx,js --transform ${path.join(
         transformerDirectory,
         'rename-unsafe-lifecycles.js'
       )} folder`
@@ -156,7 +156,7 @@ describe('runTransform', () => {
     });
     expect(console.log).toBeCalledWith(
       // eslint-disable-next-line max-len
-      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser babel --transform ${path.join(
+      `Executing command: jscodeshift --dry --verbose=2 --ignore-pattern=**/node_modules/** --parser babel --extensions=jsx,js --transform ${path.join(
         transformerDirectory,
         'rename-unsafe-lifecycles.js'
       )} verbose=2 --printOptions='{"quote":"double"}' folder`

bin/cli.js

@@ -64,8 +64,12 @@ function runTransform({ files, flags, parser, transformer, answers }) {
   args.push('--ignore-pattern=**/node_modules/**');
 
   args.push('--parser', parser);
+  
   if (parser === 'tsx') {
-    args.push('--extensions=tsx,ts');
+    args.push('--extensions=tsx,ts,jsx,js');
+  }
+  else {
+    args.push('--extensions=jsx,js');
   }
 
   args = args.concat(['--transform', transformerPath]);