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* Scaffolding for react-dom/unstable_external-server-runtime Implements a new bundle type for in our build config called BROWSER_SCRIPT. This is intended for scripts that get delivered straight to the browser without needing to be processed by a bundler. (And also doesn't include any extra UMD crap.) Right now there's only a single use case so I didn't stress about making it general purpose. The use case is: a script that loads the Fizz browser runtime, and sets up a MutationObserver to receive instructions as HTML streams in. This will be an alternative option to the default Fizz behavior of sending the runtime down as inline script tags, to accommodate environments where inline script tags are not allowed. There's no development version of this bundle because it doesn't contain any warnings or run any user code. None of the actual implementation is in this PR; it just sets up the build infra. Co-authored-by: Mofei Zhang <feifei0@fb.com> * Set BUNDLE_SCRIPT's GCC output format to ES5 This removes the automatic 'use strict' directive, which we don't need. Co-authored-by: Mofei Zhang <feifei0@fb.com>