Ship the Gutenberg JS bundle once instead of twice (−7.7 MB)

[jkmassel]

Draft — opened to produce a CI build for on-device validation. Needs a manual editor smoke-test before it's ready for review (see Test Plan).

Summary

• Ships the Gutenberg React Native JS bundle once instead of twice, removing a duplicate ~7.7 MB from the app.

Root Cause

The RN runtime loads the JS bundle via RCTBundleURLProvider / jsBundleURLForBundleRoot: — i.e. main.jsbundle from the app bundle root, placed there by the CopyGutenbergJS build phase. An identical copy (md5 fdfce7…, confirmed byte-for-byte) also ships inside the embedded Gutenberg.framework/App.js, but the framework binary references App.js zero times — it is never loaded at runtime. It existed only as the build-time copy source.

Fix

• download-gutenberg-xcframeworks.sh: strip App.js from the Gutenberg.framework slices after they're copied into WordPress/Frameworks/, so it isn't embedded into (and code-signed with) the app.
• CopyGutenbergJS.sh: source the app-root main.jsbundle from the byte-identical standalone react-native-bundle-source-map/main.jsbundle that already ships alongside the XCFramework.
• CopyGutenbergJS.inputs.xcfilelist: repoint the phase input (also fixes a pre-existing dangling input path).

Measured on a clean unsigned Release archive: −7.7 MB uncompressed, no runtime change (same main.jsbundle, same path, same bytes).

Test Plan

• On-device: open the classic (React Native) Gutenberg editor, load an existing post, insert/edit a block — confirm it loads and functions. This is the one that matters: the framework's App.js is gone, so a working editor proves the root main.jsbundle is what the runtime loads.
• Editor works from a clean rake dependencies (CI bootstraps fresh, so green CI covers the pipeline change).
• Both build scripts pass bash -n.
• The bundle we now copy is byte-identical to the previous source (md5 fdfce7…).

Notes

Local devs must re-run rake dependencies to pick up the strip (cheap — no re-download). The RN editor is being replaced by GutenbergKit; this doesn't touch that migration, it just stops shipping the RN bundle twice in the meantime.

[dangermattic]

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	Version	PR #25965
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