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[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and related code#35755

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cleanup-devtools-mcp-build-flag
Feb 11, 2026
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[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and related code#35755
hoxyq merged 1 commit intomainfrom
cleanup-devtools-mcp-build-flag

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@hoxyq hoxyq commented Feb 10, 2026

This is unused.

@hoxyq
[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and rel…
ff16e81 
…ated code

Remove the unused internal MCP build flag infrastructure that was added
for experimental MCP integration. This removes the flag declaration,
build configuration, and the __internal_only_getComponentTree function
from the DevTools renderer.
@hoxyq hoxyq requested a review from jorge-cab February 10, 2026 13:27
@meta-cla meta-cla bot added the CLA Signed label Feb 10, 2026
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react-sizebot commented Feb 10, 2026

Comparing: f23aa1d...ff16e81

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 = 6.84 kB 6.84 kB +0.05% 1.88 kB 1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js = 610.35 kB 610.35 kB = 107.89 kB 107.89 kB
oss-experimental/react-dom/cjs/react-dom.production.js = 6.84 kB 6.84 kB +0.05% 1.88 kB 1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js = 676.28 kB 676.28 kB = 118.85 kB 118.85 kB
facebook-www/ReactDOM-prod.classic.js = 696.77 kB 696.77 kB = 122.49 kB 122.49 kB
facebook-www/ReactDOM-prod.modern.js = 687.15 kB 687.15 kB = 120.89 kB 120.89 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name +/- Base Current +/- gzip Base gzip Current gzip
oss-experimental/react-markup/cjs/react-markup.react-server.production.js = 358.97 kB 358.16 kB = 66.58 kB 66.45 kB
oss-experimental/react-markup/cjs/react-markup.react-server.development.js = 677.62 kB 675.98 kB = 120.16 kB 119.82 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-client.production.js = 2.33 kB 2.32 kB = 0.87 kB 0.87 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-client.production.js = 2.33 kB 2.32 kB = 0.87 kB 0.87 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-client.production.js = 2.33 kB 2.32 kB = 0.87 kB 0.87 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-flight-client.development.js = 3.10 kB 3.08 kB = 1.09 kB 1.08 kB
oss-stable-semver/react-noop-renderer/cjs/react-noop-renderer-flight-client.development.js = 3.10 kB 3.08 kB = 1.09 kB 1.08 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-flight-client.development.js = 3.10 kB 3.08 kB = 1.09 kB 1.08 kB
oss-experimental/react-client/cjs/react-client-flight.development.js = 180.61 kB 179.04 kB = 31.38 kB 31.08 kB
oss-stable/react-client/cjs/react-client-flight.development.js = 180.61 kB 179.03 kB = 31.38 kB 31.07 kB
oss-stable-semver/react-client/cjs/react-client-flight.development.js = 180.58 kB 179.01 kB = 31.35 kB 31.05 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js = 190.30 kB 188.60 kB = 33.62 kB 33.32 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js = 190.30 kB 188.60 kB = 33.62 kB 33.32 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js = 190.30 kB 188.60 kB = 33.62 kB 33.32 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js = 190.28 kB 188.58 kB = 33.60 kB 33.30 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js = 190.28 kB 188.58 kB = 33.60 kB 33.30 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js = 190.28 kB 188.58 kB = 33.60 kB 33.30 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js = 186.93 kB 185.23 kB = 33.07 kB 32.78 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js = 186.93 kB 185.23 kB = 33.07 kB 32.78 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js = 186.93 kB 185.23 kB = 33.07 kB 32.78 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js = 191.61 kB 189.85 kB = 33.77 kB 33.47 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js = 191.59 kB 189.84 kB = 33.76 kB 33.47 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js = 191.54 kB 189.79 kB = 33.74 kB 33.45 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js = 190.98 kB 189.23 kB = 33.59 kB 33.31 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js = 190.97 kB 189.22 kB = 33.59 kB 33.31 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js = 190.92 kB 189.17 kB = 33.57 kB 33.28 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js = 191.72 kB 189.95 kB = 33.78 kB 33.45 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js = 191.72 kB 189.95 kB = 33.78 kB 33.45 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js = 191.72 kB 189.95 kB = 33.78 kB 33.45 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js = 188.42 kB 186.66 kB = 33.13 kB 32.84 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js = 188.41 kB 186.65 kB = 33.12 kB 32.84 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js = 188.36 kB 186.60 kB = 33.10 kB 32.81 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js = 186.39 kB 184.63 kB = 32.71 kB 32.42 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js = 186.37 kB 184.62 kB = 32.71 kB 32.41 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js = 186.32 kB 184.57 kB = 32.68 kB 32.39 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js = 196.80 kB 194.91 kB = 34.43 kB 34.10 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js = 196.80 kB 194.91 kB = 34.43 kB 34.10 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js = 196.80 kB 194.91 kB = 34.43 kB 34.10 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js = 196.78 kB 194.89 kB = 34.41 kB 34.08 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js = 196.78 kB 194.89 kB = 34.41 kB 34.08 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js = 196.78 kB 194.89 kB = 34.41 kB 34.08 kB
oss-experimental/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.development.js = 195.38 kB 193.49 kB = 34.14 kB 33.81 kB
oss-stable-semver/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.development.js = 195.38 kB 193.49 kB = 34.14 kB 33.81 kB
oss-stable/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.development.js = 195.38 kB 193.49 kB = 34.14 kB 33.81 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js = 193.73 kB 191.84 kB = 33.89 kB 33.57 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js = 193.73 kB 191.84 kB = 33.89 kB 33.57 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js = 193.73 kB 191.84 kB = 33.89 kB 33.57 kB
oss-experimental/react-client/cjs/react-client-flight.production.js = 70.16 kB 69.33 kB = 12.52 kB 12.37 kB
oss-stable/react-client/cjs/react-client-flight.production.js = 70.16 kB 69.32 kB = 12.52 kB 12.37 kB
oss-stable-semver/react-client/cjs/react-client-flight.production.js = 70.13 kB 69.30 kB = 12.50 kB 12.35 kB
oss-experimental/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js = 235.91 kB 233.08 kB = 52.47 kB 51.68 kB
oss-stable/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js = 235.91 kB 233.07 kB = 52.46 kB 51.68 kB
oss-stable-semver/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js = 235.88 kB 233.05 kB = 52.44 kB 51.66 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js = 70.35 kB 69.50 kB = 13.49 kB 13.33 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js = 70.35 kB 69.50 kB = 13.49 kB 13.33 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js = 70.35 kB 69.50 kB = 13.49 kB 13.33 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js = 70.29 kB 69.44 kB = 13.74 kB 13.59 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js = 70.29 kB 69.44 kB = 13.74 kB 13.59 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js = 70.29 kB 69.44 kB = 13.74 kB 13.59 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js = 70.27 kB 69.41 kB = 13.73 kB 13.58 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js = 70.27 kB 69.41 kB = 13.73 kB 13.58 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js = 70.27 kB 69.41 kB = 13.73 kB 13.58 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js = 67.26 kB 66.41 kB = 13.14 kB 12.99 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js = 67.26 kB 66.41 kB = 13.14 kB 12.99 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js = 67.26 kB 66.41 kB = 13.14 kB 12.99 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.production.js = 74.93 kB 73.97 kB = 14.45 kB 14.28 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.production.js = 74.93 kB 73.97 kB = 14.45 kB 14.28 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.production.js = 74.93 kB 73.97 kB = 14.45 kB 14.28 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js = 74.91 kB 73.95 kB = 14.44 kB 14.27 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js = 74.91 kB 73.95 kB = 14.44 kB 14.27 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js = 74.91 kB 73.95 kB = 14.44 kB 14.27 kB
oss-experimental/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.production.js = 73.76 kB 72.80 kB = 14.20 kB 14.03 kB
oss-stable-semver/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.production.js = 73.76 kB 72.80 kB = 14.20 kB 14.03 kB
oss-stable/react-server-dom-unbundled/cjs/react-server-dom-unbundled-client.node.production.js = 73.76 kB 72.80 kB = 14.20 kB 14.03 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js = 64.31 kB 63.45 kB = 12.50 kB 12.34 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js = 64.31 kB 63.45 kB = 12.50 kB 12.34 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js = 64.31 kB 63.45 kB = 12.50 kB 12.34 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js = 63.94 kB 63.08 kB = 12.42 kB 12.26 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js = 63.94 kB 63.08 kB = 12.42 kB 12.26 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js = 63.94 kB 63.08 kB = 12.42 kB 12.26 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js = 71.70 kB 70.74 kB = 13.80 kB 13.63 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js = 71.70 kB 70.74 kB = 13.80 kB 13.63 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js = 71.70 kB 70.74 kB = 13.80 kB 13.63 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js = 61.92 kB 61.06 kB = 12.01 kB 11.84 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js = 61.92 kB 61.06 kB = 12.01 kB 11.84 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js = 61.92 kB 61.06 kB = 12.01 kB 11.84 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js = 61.74 kB 60.89 kB = 11.96 kB 11.79 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js = 61.74 kB 60.89 kB = 11.96 kB 11.79 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js = 61.74 kB 60.89 kB = 11.96 kB 11.79 kB
oss-experimental/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js = 101.57 kB 99.71 kB = 20.71 kB 20.28 kB
oss-stable-semver/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js = 101.57 kB 99.71 kB = 20.71 kB 20.28 kB
oss-stable/react-server-dom-esm/esm/react-server-dom-esm-client.browser.production.js = 101.57 kB 99.71 kB = 20.71 kB 20.28 kB

Generated by 🚫 dangerJS against ff16e81

@hoxyq hoxyq merged commit 8374c2a into main Feb 11, 2026
243 checks passed
@hoxyq hoxyq deleted the cleanup-devtools-mcp-build-flag branch February 11, 2026 16:59
github-actions bot pushed a commit to shtefanovsock/react that referenced this pull request Feb 11, 2026
@shtefanovsock
[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and rel…
7b58608 
…ated code (facebook#35755)

This is unused.

DiffTrain build for [8374c2a](facebook@8374c2a)
github-actions bot pushed a commit to shtefanovsock/react that referenced this pull request Feb 11, 2026
@shtefanovsock
[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and rel…
25e61d2 
…ated code (facebook#35755)

This is unused.

DiffTrain build for [8374c2a](facebook@8374c2a)
@nextjs-bot nextjs-bot mentioned this pull request Feb 12, 2026
Merged
github-actions bot pushed a commit to code/lib-react that referenced this pull request Feb 15, 2026
@pull
[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and rel…
e8cc357 
…ated code (facebook#35755)

This is unused.

DiffTrain build for [8374c2a](facebook@8374c2a)
github-actions bot pushed a commit to code/lib-react that referenced this pull request Feb 15, 2026
@pull
[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and rel…
2448a8d 
…ated code (facebook#35755)

This is unused.

DiffTrain build for [8374c2a](facebook@8374c2a)
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