by samccone

samccone /coverage-ext

Generate code coverage for any webpage

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What is this?

This is an extension to an old version of chrome + a custom istanbul reporter. This combo gives you the power to view what JS gets evaluated on any website.



  1. Download an old version of chrome Mac / Win
    • The reason why we have to use an old version is because we are utilizing a cool API chrome used to have to preprocess any JS file before it gets evaluated by v8. This feature was reverted here.
  2. Download this repo and extract it somewhere
  3. Open a prompt in the
  4. npm i
  5. Run the old chrome version
  6. Navigate to
    and enable developer mode
  7. Click "Load unpacked extension..." and select the
    folder from the repo

Example Usage

  1. Visit
  2. Open up dev tools.
  3. Click on the get coveragez button.
  4. The page will reload, wait for it to complete.
  5. Click on the copy button.
  6. Run
    pbpaste > ycombinator-data
  7. cd reporter
  8. node gen_report.js ../ycombinator-data
  9. open
    to view the report

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