add --dev flag to the packager's dependencies command

Summary:
The packager dependencies CLI command always operates on --dev=true today. This means any tooling that needs to get the production dependencies (--dev=false) will always get the dev-mode list instead. For instance:

```
if (__DEV__) {
  require('Foobar');
}
```

Previously, `Foobar.js` will always be listed in the CLI output. With this change, setting `--dev false` option will correctly skip `Foobar.js` in the output.

Reviewed By: cpojer

Differential Revision: D5163184

fbshipit-source-id: 203221ee5d6ecb7df575442f12f6c4c489bfbd46

local-cli/dependencies/dependencies.js

@@ -47,6 +47,9 @@ function dependencies(argv, config, args, packagerInstance) {
   const options = {
     platform: args.platform,
     entryFile: relativePath,
+    dev: args.dev,
+    minify: !args.dev,
+    generateSourceMaps: !args.dev,
   };
 
   const writeToFile = args.output;
@@ -94,6 +97,11 @@ module.exports = {
     }, {
       command: '--transformer [path]',
       description: 'Specify a custom transformer to be used'
+    }, {
+      command: '--dev [boolean]',
+      description: 'If false, skip all dev-only code path',
+      parse: (val) => val === 'false' ? false : true,
+      default: true,
     }, {
       command: '--verbose',
       description: 'Enables logging',

packager/src/Bundler/index.js

@@ -596,12 +596,14 @@ class Bundler {
     return response;
   }
 
-  getOrderedDependencyPaths({entryFile, dev, platform}: {
+  getOrderedDependencyPaths({entryFile, dev, platform, minify, generateSourceMaps}: {
     +entryFile: string,
     +dev: boolean,
     +platform: string,
+    +minify: boolean,
+    +generateSourceMaps: boolean,
   }) {
-    return this.getDependencies({entryFile, dev, platform}).then(
+    return this.getDependencies({entryFile, dev, platform, minify, generateSourceMaps}).then(
       ({dependencies}) => {
         const ret = [];
         const promises = [];

packager/src/Server/index.js

@@ -319,6 +319,8 @@ class Server {
     +entryFile: string,
     +dev: boolean,
     +platform: string,
+    +minify: boolean,
+    +generateSourceMaps: boolean,
   }): Promise<mixed> {
     return Promise.resolve().then(() => {
       return this._bundler.getOrderedDependencyPaths(options);

packager/src/index.js

@@ -92,6 +92,8 @@ exports.getOrderedDependencyPaths = function(options: Options, depOptions: {
   +entryFile: string,
   +dev: boolean,
   +platform: string,
+  +minify: boolean,
+  +generateSourceMaps: boolean,
 }) {
   var server = createNonPersistentServer(options);
   return server.getOrderedDependencyPaths(depOptions)