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+# @npmcli/ci-detect
+
+Detect what kind of CI environment the program is in
+
+[![Build Status](https://travis-ci.com/npm/ci-detect.svg?branch=master)](https://travis-ci.com/npm/ci-detect)
+[![Coverage Status](https://coveralls.io/repos/github/npm/ci-detect/badge.svg?branch=master)](https://coveralls.io/github/npm/ci-detect?branch=master)
+
+## USAGE
+
+```js
+const ciDetect = require('@npmcli/ci-detect')
+// false if not in CI
+// otherwise, a string indicating the CI environment type
+const inCI = ciDetect()
+```
+
+## CIs Detected
+
+Returns one of the following strings, or `false` if none match, by looking
+at the appropriate environment variables.
+
+* `'gerrit'` Gerrit
+* `'gitlab'` GitLab
+* `'circleci'` Circle-CI
+* `'semaphore'` Semaphore
+* `'drone'` Drone
+* `'github-actions'` GitHub Actions
+* `'tddium'` TDDium
+* `'jenkins'` Jenkins
+* `'bamboo'` Bamboo
+* `'gocd'` GoCD
+* `'wercker'` Oracle Wercker
+* `'netlify'` Netlify
+* `'now-github'` Zeit.co's Now for GitHub deployment service
+* `'now-bitbucket'` Zeit.co's Now for BitBucket deployment service
+* `'now-gitlab'` Zeit.co's Now for GitLab deployment service
+* `'now'` Zeit.co's Now service, but not GitHub/BitBucket/GitLab
+* `'azure-pipelines'` Azure Pipelines
+* `'bitrise'` Bitrise
+* `'buddy'` Buddy
+* `'buildkite'` Buildkite
+* `'cirrus'` Cirrus CI
+* `'dsari'` dsari CI
+* `'strider'` Strider CI
+* `'taskcluster'` Mozilla Taskcluster
+* `'hudson'` Hudson CI
+* `'magnum'` Magnum CI
+* `'nevercode'` Nevercode
+* `'render'` Render CI
+* `'sail'` Sail CI
+* `'shippable'` Shippable
+* `'heroku'` Heroku
+* `'codeship'` CodeShip
+* Anything that sets the `CI_NAME` environment variable will return the
+ value as the result. (This is how CodeShip is detected.)
+* `'travis-ci'` Travis-CI - A few other CI systems set `TRAVIS=1` in the
+ environment, because devs use that to indicate "test mode", so this one
+ can get some false positives, and is tested later in the process to
+ minimize this effect.
+* `'aws-codebuild'` AWS CodeBuild
+* `'builder'` Google Cloud Builder - This one is a bit weird. It doesn't
+ really set anything that can be reliably detected except
+ `BUILDER_OUTPUT`, so it can get false positives pretty easily.
+* `'custom'` anything else that sets `CI` environment variable to either
+ `'1'` or `'true'`.
+
+## Caveats
+
+Note that since any program can set or unset whatever environment variables
+they want, this is not 100% reliable.
+
+Also, note that if your program does different behavior in
+CI/test/deployment than other places, then there's a good chance that
+you're doing something wrong!
+
+But, for little niceties like setting colors or other output parameters, or
+logging and that sort of non-essential thing, this module provides a way to
+tweak without checking a bunch of things in a bunch of places. Mostly,
+it's a single place to keep a note of what CI system sets which environment
+variable.