[Flight] Do not redefine debugInfo on JSX elements

[devongovett]

After updating to 19.2 in Parcel, I'm seeing "Cannot redefine property _debugInfo" errors, which appear to be caused by #34524. Looks like _debugInfo is already defined as null in some cases (e.g. JSX elements), and marked as non-configurable/writable. Then moveDebugInfoFromChunkToInnerValue tries to re-define it.

This happens when you directly export a JSX element as a client reference. In that case the React Element object is frozen, so the _debugInfo property cannot be written to.

"use client";
export default <Foo />

I added a test for this and made a small workaround that simply skips setting _debugInfo if it is not writable, but idk if this is the correct fix.

[react-sizebot]

Comparing: 408b38e...c776f1c

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	605.41 kB	605.41 kB	=	107.22 kB	107.22 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	+0.05%	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	664.38 kB	664.38 kB	=	117.09 kB	117.09 kB
facebook-www/ReactDOM-prod.classic.js	=	688.25 kB	688.25 kB	=	121.13 kB	121.13 kB
facebook-www/ReactDOM-prod.modern.js	=	678.67 kB	678.67 kB	=	119.49 kB	119.49 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js	+0.30%	93.66 kB	93.95 kB	+0.51%	19.20 kB	19.29 kB
oss-stable/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js	+0.30%	93.66 kB	93.95 kB	+0.51%	19.20 kB	19.29 kB
oss-experimental/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js	+0.30%	94.45 kB	94.73 kB	+0.50%	19.31 kB	19.41 kB

Generated by 🚫 dangerJS against c776f1c