Commits on Oct 15, 2022

1. 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>

   

   acdlite and mofeiZ committed Oct 15, 2022
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2. Set BUNDLE_SCRIPT's GCC output format to ES5 …

   This removes the automatic 'use strict' directive, which we don't need.

   

   acdlite committed Oct 15, 2022
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