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npm-ci.html
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npm-ci.html
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<!DOCTYPE html><html><head>
<meta charset="utf-8">
<title>npm-ci</title>
<style>
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<div class="title">
npm command-line interface
</div>
</div>
</div>
<section id="content">
<header class="title">
<h1 id="npm-ci">npm-ci</h1>
<span class="description">Install a project with a clean slate</span>
</header>
<section id="table_of_contents">
<h2 id="table-of-contents">Table of contents</h2>
<div id="_table_of_contents"><ul><li><a href="#synopsis">Synopsis</a></li><li><a href="#description">Description</a></li><li><a href="#example">Example</a></li><li><a href="#configuration">Configuration</a></li><ul><li><a href="#audit"><code>audit</code></a></li><li><a href="#foreground-scripts"><code>foreground-scripts</code></a></li><li><a href="#ignore-scripts"><code>ignore-scripts</code></a></li><li><a href="#script-shell"><code>script-shell</code></a></li></ul><li><a href="#see-also">See Also</a></li></ul></div>
</section>
<div id="_content"><h3 id="synopsis">Synopsis</h3>
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<pre lang="bash"><code>npm ci
aliases: clean-install, ic, install-clean, isntall-clean
</code></pre>
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<h3 id="description">Description</h3>
<p>This command is similar to <a href="../commands/npm-install.html"><code>npm install</code></a>, except
it's meant to be used in automated environments such as test platforms,
continuous integration, and deployment -- or any situation where you want
to make sure you're doing a clean install of your dependencies.</p>
<p><code>npm ci</code> will be significantly faster when:</p>
<ul>
<li>There is a <code>package-lock.json</code> or <code>npm-shrinkwrap.json</code> file.</li>
<li>The <code>node_modules</code> folder is missing or empty.</li>
</ul>
<p>In short, the main differences between using <code>npm install</code> and <code>npm ci</code> are:</p>
<ul>
<li>The project <strong>must</strong> have an existing <code>package-lock.json</code> or
<code>npm-shrinkwrap.json</code>.</li>
<li>If dependencies in the package lock do not match those in <code>package.json</code>,
<code>npm ci</code> will exit with an error, instead of updating the package lock.</li>
<li><code>npm ci</code> can only install entire projects at a time: individual
dependencies cannot be added with this command.</li>
<li>If a <code>node_modules</code> is already present, it will be automatically removed
before <code>npm ci</code> begins its install.</li>
<li>It will never write to <code>package.json</code> or any of the package-locks:
installs are essentially frozen.</li>
</ul>
<p>NOTE: If you create your <code>package-lock.json</code> file by running <code>npm install</code>
with flags that can affect the shape of your dependency tree, such as
<code>--legacy-peer-deps</code> or <code>--install-links</code>, you <em>must</em> provide the same
flags to <code>npm ci</code> or you are likely to encounter errors. An easy way to do
this is to run, for example,
<code>npm config set legacy-peer-deps=true --location=project</code> and commit the
<code>.npmrc</code> file to your repo.</p>
<h3 id="example">Example</h3>
<p>Make sure you have a package-lock and an up-to-date install:</p>
<pre lang="bash"><code>$ cd ./my/npm/project
$ npm install
added 154 packages in 10s
$ ls | grep package-lock
</code></pre>
<p>Run <code>npm ci</code> in that project</p>
<pre lang="bash"><code>$ npm ci
added 154 packages in 5s
</code></pre>
<p>Configure Travis to build using <code>npm ci</code> instead of <code>npm install</code>:</p>
<pre lang="bash"><code># .travis.yml
install:
- npm ci
# keep the npm cache around to speed up installs
cache:
directories:
- "$HOME/.npm"
</code></pre>
<h3 id="configuration">Configuration</h3>
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<h4 id="audit"><code>audit</code></h4>
<ul>
<li>Default: true</li>
<li>Type: Boolean</li>
</ul>
<p>When "true" submit audit reports alongside the current npm command to the
default registry and all registries configured for scopes. See the
documentation for <a href="../commands/npm-audit.html"><code>npm audit</code></a> for details on what is
submitted.</p>
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<h4 id="foreground-scripts"><code>foreground-scripts</code></h4>
<ul>
<li>Default: false</li>
<li>Type: Boolean</li>
</ul>
<p>Run all build scripts (ie, <code>preinstall</code>, <code>install</code>, and <code>postinstall</code>)
scripts for installed packages in the foreground process, sharing standard
input, output, and error with the main npm process.</p>
<p>Note that this will generally make installs run slower, and be much noisier,
but can be useful for debugging.</p>
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<h4 id="ignore-scripts"><code>ignore-scripts</code></h4>
<ul>
<li>Default: false</li>
<li>Type: Boolean</li>
</ul>
<p>If true, npm does not run scripts specified in package.json files.</p>
<p>Note that commands explicitly intended to run a particular script, such as
<code>npm start</code>, <code>npm stop</code>, <code>npm restart</code>, <code>npm test</code>, and <code>npm run-script</code>
will still run their intended script if <code>ignore-scripts</code> is set, but they
will <em>not</em> run any pre- or post-scripts.</p>
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<h4 id="script-shell"><code>script-shell</code></h4>
<ul>
<li>Default: '/bin/sh' on POSIX systems, 'cmd.exe' on Windows</li>
<li>Type: null or String</li>
</ul>
<p>The shell to use for scripts run with the <code>npm exec</code>, <code>npm run</code> and <code>npm init <pkg></code> commands.</p>
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<h3 id="see-also">See Also</h3>
<ul>
<li><a href="../commands/npm-install.html">npm install</a></li>
<li><a href="../configuring-npm/package-lock-json.html">package-lock.json</a></li>
</ul>
</div>
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