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npm command-line interface
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<header class="title">
<h1 id="npm-diff">npm-diff</h1>
<span class="description">The registry diff command</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="#see-also">See Also</a></li></ul></div>
</section>
<div id="_content"><h3 id="synopsis">Synopsis</h3>
<pre lang="bash"><code>npm diff [...<paths>]
npm diff --diff=<pkg-name> [...<paths>]
npm diff --diff=<version-a> [--diff=<version-b>] [...<paths>]
npm diff --diff=<spec-a> [--diff=<spec-b>] [...<paths>]
npm diff [--diff-ignore-all-space] [--diff-name-only] [...<paths>]
</code></pre>
<h3 id="description">Description</h3>
<p>Similar to its <code>git diff</code> counterpart, this command will print diff patches
of files for packages published to the npm registry.</p>
<ul>
<li>
<p><code>npm diff --diff=<spec-a> --diff=<spec-b></code></p>
<p>Compares two package versions using their registry specifiers, e.g:
<code>npm diff --diff=pkg@1.0.0 --diff=pkg@^2.0.0</code>. It’s also possible to
compare across forks of any package,
e.g: <code>npm diff --diff=pkg@1.0.0 --diff=pkg-fork@1.0.0</code>.</p>
<p>Any valid spec can be used, so that it’s also possible to compare
directories or git repositories,
e.g: <code>npm diff --diff=pkg@latest --diff=./packages/pkg</code></p>
<p>Here’s an example comparing two different versions of a package named
<code>abbrev</code> from the registry:</p>
<pre lang="bash"><code>npm diff --diff=abbrev@1.1.0 --diff=abbrev@1.1.1
</code></pre>
<p>On success, output looks like:</p>
<pre lang="bash"><code>diff --git a/package.json b/package.json
index v1.1.0..v1.1.1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
{
"name": "abbrev",
- "version": "1.1.0",
+ "version": "1.1.1",
"description": "Like ruby's abbrev module, but in js",
"author": "Isaac Z. Schlueter <i@izs.me>",
"main": "abbrev.js",
</code></pre>
<p>Given the flexible nature of npm specs, you can also target local
directories or git repos just like when using <code>npm install</code>:</p>
<pre lang="bash"><code>npm diff --diff=https://github.com/npm/libnpmdiff --diff=./local-path
</code></pre>
<p>In the example above we can compare the contents from the package installed
from the git repo at <code>github.com/npm/libnpmdiff</code> with the contents of the
<code>./local-path</code> that contains a valid package, such as a modified copy of
the original.</p>
</li>
<li>
<p><code>npm diff</code> (in a package directory, no arguments):</p>
<p>If the package is published to the registry, <code>npm diff</code> will fetch the
tarball version tagged as <code>latest</code> (this value can be configured using the
<code>tag</code> option) and proceed to compare the contents of files present in that
tarball, with the current files in your local file system.</p>
<p>This workflow provides a handy way for package authors to see what
package-tracked files have been changed in comparison with the latest
published version of that package.</p>
</li>
<li>
<p><code>npm diff --diff=<pkg-name></code> (in a package directory):</p>
<p>When using a single package name (with no version or tag specifier) as an
argument, <code>npm diff</code> will work in a similar way to
<a href="npm-outdated"><code>npm-outdated</code></a> and reach for the registry to figure out
what current published version of the package named <code><pkg-name></code>
will satisfy its dependent declared semver-range. Once that specific
version is known <code>npm diff</code> will print diff patches comparing the
current version of <code><pkg-name></code> found in the local file system with
that specific version returned by the registry.</p>
<p>Given a package named <code>abbrev</code> that is currently installed:</p>
<pre lang="bash"><code>npm diff --diff=abbrev
</code></pre>
<p>That will request from the registry its most up to date version and
will print a diff output comparing the currently installed version to this
newer one if the version numbers are not the same.</p>
</li>
<li>
<p><code>npm diff --diff=<spec-a></code> (in a package directory):</p>
<p>Similar to using only a single package name, it’s also possible to declare
a full registry specifier version if you wish to compare the local version
of an installed package with the specific version/tag/semver-range provided
in <code><spec-a></code>.</p>
<p>An example: assuming <code>pkg@1.0.0</code> is installed in the current <code>node_modules</code>
folder, running:</p>
<pre lang="bash"><code>npm diff --diff=pkg@2.0.0
</code></pre>
<p>It will effectively be an alias to
<code>npm diff --diff=pkg@1.0.0 --diff=pkg@2.0.0</code>.</p>
</li>
<li>
<p><code>npm diff --diff=<semver-a> [--diff=<semver-b>]</code> (in a package directory):</p>
<p>Using <code>npm diff</code> along with semver-valid version numbers is a shorthand
to compare different versions of the current package.</p>
<p>It needs to be run from a package directory, such that for a package named
<code>pkg</code> running <code>npm diff --diff=1.0.0 --diff=1.0.1</code> is the same as running
<code>npm diff --diff=pkg@1.0.0 --diff=pkg@1.0.1</code>.</p>
<p>If only a single argument <code><version-a></code> is provided, then the current local
file system is going to be compared against that version.</p>
<p>Here’s an example comparing two specific versions (published to the
configured registry) of the current project directory:</p>
<pre lang="bash"><code>npm diff --diff=1.0.0 --diff=1.1.0
</code></pre>
</li>
</ul>
<p>Note that tag names are not valid <code>--diff</code> argument values, if you wish to
compare to a published tag, you must use the <code>pkg@tagname</code> syntax.</p>
<h4 id="filtering-files">Filtering files</h4>
<p>It’s possible to also specify positional arguments using file names or globs
pattern matching in order to limit the result of diff patches to only a subset
of files for a given package, e.g:</p>
<pre lang="bash"><code>npm diff --diff=pkg@2 ./lib/ CHANGELOG.md
</code></pre>
<p>In the example above the diff output is only going to print contents of files
located within the folder <code>./lib/</code> and changed lines of code within the
<code>CHANGELOG.md</code> file.</p>
<h3 id="configuration">Configuration</h3>
<h4 id="diff">diff</h4>
<ul>
<li>Type: Array</li>
<li>Default: null</li>
</ul>
<p>Defines npm package specifiers to compare using the <code>npm diff</code> command.</p>
<p>This can be specified up to 2 times.</p>
<h4 id="diff-name-only">diff-name-only</h4>
<ul>
<li>Type: Boolean</li>
<li>Default: false</li>
</ul>
<p>When set to <code>true</code> running <code>npm diff</code> only returns the names of the files that
have any difference.</p>
<h4 id="diff-unified">diff-unified</h4>
<ul>
<li>Type: Number</li>
<li>Default: <code>3</code></li>
</ul>
<p>The number of lines of context to print in the unified diff format output.</p>
<h4 id="diff-ignore-all-space">diff-ignore-all-space</h4>
<ul>
<li>Type: Boolean</li>
<li>Default: false</li>
</ul>
<p>Ignore whitespace when comparing lines. This ignores differences even if one
line has whitespace where the other line has none.</p>
<h4 id="diff-no-prefix">diff-no-prefix</h4>
<ul>
<li>Type: Boolean</li>
<li>Default: false</li>
</ul>
<p>Do not show any source or destination prefix.</p>
<h4 id="diff-src-prefix">diff-src-prefix</h4>
<ul>
<li>Type: String</li>
<li>Default: <code>"a/"</code></li>
</ul>
<p>Show the given source prefix in diff patches headers instead of using “a/”.</p>
<h4 id="diff-dst-prefix">diff-dst-prefix</h4>
<ul>
<li>Type: String</li>
<li>Default: <code>"b/"</code></li>
</ul>
<p>Show the given source prefix in diff patches headers instead of using “b/”.</p>
<h4 id="diff-text">diff-text</h4>
<ul>
<li>Type: Boolean</li>
<li>Default: false</li>
</ul>
<p>Treat all files as text.</p>
<h4 id="global">global</h4>
<ul>
<li>Default: false</li>
<li>Type: Boolean</li>
</ul>
<p>Uses packages from the global space as a source for comparison.</p>
<h4 id="tag">tag</h4>
<ul>
<li>Type: String</li>
<li>Default: <code>"latest"</code></li>
</ul>
<p>The tag used to fetch the tarball that will be compared with the local file
system files when running npm diff with no arguments.</p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="../commands/npm-outdated.html">npm outdated</a></li>
<li><a href="../commands/npm-install.html">npm install</a></li>
<li><a href="../commands/npm-config.html">npm config</a></li>
<li><a href="../using-npm/registry.html">npm registry</a></li>
</ul>
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