Chrome DevTools frontend

The client-side of the Chrome DevTools, including all JS & CSS to run the DevTools webapp.

Source code

The frontend is available on chromium.googlesource.com.

Design Guidelines

Please be aware that DevTools follows additional development guidelines.

Workflows

In order to make changes to DevTools frontend, build, run, test, and submit changes, several workflows exist. Having depot_tools set up is a common prerequisite.

Integrate standalone checkout into Chromium (strongly recommended)

This workflow will ensure that your local setup is equivalent to how Chromium infrastructure tests your change. It also allows you to develop DevTools independently of the version in your Chromium checkout. This means that you don't need to update Chromium often, in order to work on DevTools.

In chromium/src, run gclient sync to make sure you have installed all required submodules.

gclient sync

Then, disable gclient sync for DevTools frontend inside of Chromium by editing .gclient config. From chromium/src/, simply run

vim $(gclient root)/.gclient

In the custom_deps section, insert this line:

"src/third_party/devtools-frontend/src": None,

Then run

gclient sync -D

This removes the DevTools frontend dependency. We now create a symlink to refer to the standalone checkout (execute in chromium/src and make sure that third_party/devtools-frontend exists):

(Note that the folder names do NOT include the trailing slash)

ln -s path/to/standalone/devtools-frontend third_party/devtools-frontend/src

Running gclient sync in chromium/src/ will update dependencies for the Chromium checkout. Running gclient sync in chromium/src/third_party/devtools-frontend/src will update dependencies for the standalone checkout.

Standalone workflow

As a standalone project, Chrome DevTools frontend can be checked out and built independently from Chromium. The main advantage is not having to check out and build Chromium. However, there is also no way to run layout tests in this workflow.

Checking out source

To check out the source for DevTools frontend only, follow these steps:

mkdir devtools
cd devtools
fetch devtools-frontend

Build

To build, follow these steps:

cd devtools-frontend
gn gen out/Default
autoninja -C out/Default

The resulting build artifacts can be found in out/Default/resources/inspector.

Update to latest

To update to latest tip of tree version:

git fetch origin
git checkout origin/master
gclient sync

Run in Chromium

These steps work with Chromium 79 or later. To run the production build, use

(Requires brew install coreutils on Mac.)

<path-to-chrome>/chrome --custom-devtools-frontend=file://$(realpath out/Default/resources/inspector)

To run the debug build (directly symlinked to the original unminified source files), build both Chromium and DevTools frontend with the GN flag debug_devtools=true, and use

<path-to-chrome>/chrome --custom-devtools-frontend=file://$(realpath out/Default/resources/inspector/debug)

You can inspect DevTools with DevTools by undocking DevTools and then open the developers tools (F12 on Windows/Linux, Cmd+Option+I on Mac).

Test

Test are available by running scripts in scripts/test/.

Create a change

Usual steps for creating a change work out of the box.

Managing dependencies

• To sync dependencies from Chromium to DevTools frontend, use scripts/deps/roll_deps.py.
• To roll the HEAD commit of DevTools frontend into Chromium, use scripts/deps/roll_to_chromium.py.
• To update DevTools frontend's DEPS, use roll-dep.

Chromium workflow (discouraged)

DevTools frontend can also be developed as part of the full Chromium checkout. This workflow can be used to make small patches to DevTools as a Chromium engineer. However, it is different to our infrastructure setup and how to execute general maintenance work.

Checking out source

Follow instructions to check out Chromium. DevTools frontend can be found under third_party/devtools-frontend/src/.

Build

Refer to instructions to build Chromium. To only build DevTools frontend, use devtools_frontend_resources as build target. The resulting build artifacts for DevTools frontend can be found in out/Default/resources/inspector.

Consider building with the GN flag debug_devtools=true to symlink to the original unminified source.

Run

Run Chrome with DevTools frontend bundled:

out/Default/chrome

Test

Test are available by running scripts in third_party/devtools-frontend/src/scripts/test/. After building content shell, we can also run layout tests that are relevant for DevTools frontend:

autoninja -C out/Default content_shell
third_party/blink/tools/run_web_tests.py http/tests/devtools

Create a change

Usual steps for creating a change work out of the box, when executed in third_party/devtools-frontend/src/.

Testing

Please refer to the overview document. The current test status can be seen at the test waterfall.

Additional references

• DevTools documentation: devtools.chrome.com
• Debugging protocol docs and Chrome Debugging Protocol Viewer
• awesome-chrome-devtools: recommended tools and resources
• Contributing to DevTools: bit.ly/devtools-contribution-guide
• Contributing To Chrome DevTools Protocol: docs.google.com
• DevTools Design Review Guidelines: DESGN_GUIDELINES.MD

Merges and Cherry-Picks

Merge request/approval is handled by Chromium Release Managers. DevTools follows The Zen of Merge Requests. In exceptional cases please get in touch with hablich@chromium.org.

Step-by-step guide on how to merge:

1. Request and receive approval to merge
2. Backmerges are done to the chromium/xxxx (e.g. chromium/3979) branch respectively on the DevTools frontend repo
3. Use Omahaproxy to find out what branch a major Chromium version has (column true_branch). Open the to-be-merged commit in Gerrit e.g. Example
4. Click hamburger menu on the top right and select Cherry Pick
5. Select branch to merge to e.g. chromium/3968
6. Cherry Pick CL is created e.g. Example
7. Get it reviewed if necessary
8. Click hamburger menu on the cherry pick CL and select Submit
9. Done

Useful Commands

git cl format --js

Formats all code using clang-format.

npm run check

Runs all static analysis checks on DevTools code.

Source mirrors

DevTools frontend repository is mirrored on GitHub.

DevTools frontend is also available on NPM as the chrome-devtools-frontend package. It's not currently available via CJS or ES2015 modules, so consuming this package in other tools may require some effort.

The version number of the npm package (e.g. 1.0.373466) refers to the Chromium commit position of latest frontend git commit. It's incremented with every Chromium commit, however the package is updated roughly daily.

Getting in touch

• All devtools commits: View the log or follow @DevToolsCommits on Twitter

• All open DevTools tickets on crbug.com

• File a new DevTools ticket: new.crbug.com

• Code reviews mailing list: devtools-reviews@chromium.org

• @ChromeDevTools on Twitter

• Chrome DevTools mailing list: groups.google.com/forum/google-chrome-developer-tools