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Rafael Oleza
33ba5e8fa2
Summary: This diff tries to fix an issue that started appearing in RN master when the latest metro version is used (more info here: https://github.com/facebook/react-native/commit/c5ce7626977a7650e8dce335f2ce78b94839a2a8#commitcomment-29443117). The problem is that RN is still reading `projectRoots` from the Metro config and trying to call `concat()` on them. Latest Metro sets the default `projectRoots` to null, so this fails. Also, a couple other things have been done: * Make sure that the `projectRoot` and `watchFolder` objects from args are passed to Metro (so they contain the overrides from the CLI arguments). * Add a `--projectRoot` CLI arg, replacing the `--root` one (this is not actually needed, since it does the same as `--watchFolders` Differential Revision: D8567229 fbshipit-source-id: 3b76fd8e23d201a4097e9dfba3a512d64f348cb0