Fix ejecting from a scoped fork (facebook#1727)

* Read script names from own bin instead of guessing

This fixes ejecting from a fork that uses a different bin script name.

* Fix ejecting for a scoped react-scripts fork

We shouldn't hardcode react-scripts because fork name might differ.
We also shouldn't rely on it being an immediate child because scoped packages are a level deeper.

* Clarify that own* properties only exist before ejecting

# Conflicts:
#   packages/react-cy-scripts/scripts/eject.js

packages/react-cy-scripts/config/paths.js

@@ -84,7 +84,6 @@ module.exports = {
   yarnLockFile: resolveApp('yarn.lock'),
   testsSetup: resolveApp('src/setupTests.js'),
   appNodeModules: resolveApp('node_modules'),
-  ownNodeModules: resolveApp('node_modules'),
   nodePaths: nodePaths,
   publicUrl: getPublicUrl(resolveApp('package.json')),
   servedPath: getServedPath(resolveApp('package.json'))
@@ -98,7 +97,6 @@ function resolveOwn(relativePath) {
 // config before eject: we're in ./node_modules/react-cy-scripts/config/
 module.exports = {
   appPath: resolveApp('.'),
-  ownPath: resolveApp('node_modules/react-scripts'),
   appBuild: resolveApp('build'),
   appPublic: resolveApp('public'),
   appHtml: resolveApp('public/index.html'),
@@ -108,11 +106,12 @@ module.exports = {
   yarnLockFile: resolveApp('yarn.lock'),
   testsSetup: resolveApp('src/setupTests.js'),
   appNodeModules: resolveApp('node_modules'),
-  // this is empty with npm3 but node resolution searches higher anyway:
-  ownNodeModules: resolveOwn('node_modules'),
   nodePaths: nodePaths,
   publicUrl: getPublicUrl(resolveApp('package.json')),
-  servedPath: getServedPath(resolveApp('package.json'))
+  servedPath: getServedPath(resolveApp('package.json')),
+  // These properties only exist before ejecting:
+  ownPath: resolveOwn('.'),
+  ownNodeModules: resolveOwn('node_modules'), // This is empty on npm 3
 };
 
 var reactScriptsPath = path.resolve('node_modules/react-cy-scripts');
@@ -122,7 +121,6 @@ var reactScriptsLinked = fs.existsSync(reactScriptsPath) && fs.lstatSync(reactSc
 if (!reactScriptsLinked && __dirname.indexOf(path.join('packages', 'react-cy-scripts', 'config')) !== -1) {
   module.exports = {
     appPath: resolveApp('.'),
-    ownPath: resolveOwn('.'),
     appBuild: resolveOwn('../../build'),
     appPublic: resolveOwn('template/public'),
     appHtml: resolveOwn('template/public/index.html'),
@@ -132,10 +130,12 @@ if (!reactScriptsLinked && __dirname.indexOf(path.join('packages', 'react-cy-scr
     yarnLockFile: resolveOwn('template/yarn.lock'),
     testsSetup: resolveOwn('template/src/setupTests.js'),
     appNodeModules: resolveOwn('node_modules'),
-    ownNodeModules: resolveOwn('node_modules'),
     nodePaths: nodePaths,
     publicUrl: getPublicUrl(resolveOwn('package.json')),
-    servedPath: getServedPath(resolveOwn('package.json'))
+    servedPath: getServedPath(resolveOwn('package.json')),
+    // These properties only exist before ejecting:
+    ownPath: resolveOwn('.'),
+    ownNodeModules: resolveOwn('node_modules'),
   };
 }
 // @remove-on-eject-end

packages/react-cy-scripts/scripts/eject.js

@@ -120,14 +120,17 @@ prompt(
   console.log(cyan('Updating the scripts'));
   delete appPackage.scripts['eject'];
   Object.keys(appPackage.scripts).forEach(function (key) {
-    appPackage.scripts[key] = appPackage.scripts[key]
-      .replace(/react-cy-scripts (\w+)/g, 'node scripts/$1.js');
-    console.log(
-      '  Replacing ' +
-      cyan('"react-cy-scripts ' + key + '"') +
-      ' with ' +
-      cyan('"node scripts/' + key + '.js"')
-    );
+    Object.keys(ownPackage.bin).forEach(function (binKey) {
+      var regex = new RegExp(binKey + ' (\\w+)', 'g');
+      appPackage.scripts[key] = appPackage.scripts[key]
+        .replace(regex, 'node scripts/$1.js');
+      console.log(
+        '  Replacing ' +
+        cyan('"' + binKey + ' ' + key + '"') +
+        ' with ' +
+        cyan('"node scripts/' + key + '.js"')
+      );
+    });
   });
 
   console.log();