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Summary: `babel/preset-env` pulls in a number of unused deps, like `caniuse-lite` (3 MiB) that knows about which browsers support certain features. We do not ship to browsers and always know which version of node we are using, so we don't need to pull this in. I changed `jscodeshift` to optionally depend on `babel/preset-env` instead of always pulling it in. This reduces node_modules by 7 MiB. Changelog: [Internal] Reviewed By: yungsters Differential Revision: D21374475 fbshipit-source-id: 6f55e96e990ec0ca12f17bb3657bfa5429796b93