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href="../../cli-commands/npm-org">npm org<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Manage orgs</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-outdated">npm outdated<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Check for outdated packages</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-owner">npm owner<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Manage package owners</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-pack">npm pack<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Create a tarball from a package</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-ping">npm ping<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Ping npm registry</span></a></div><div 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class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Start a package</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-stop">npm stop<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Stop a package</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-team">npm team<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Manage organization teams and team memberships</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-test">npm test<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Test a package</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-token">npm token<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Manage your authentication tokens</span></a></div><div class="css-l3rx45"><a 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bNiGAM">View registry info</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-whoami">npm whoami<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Display npm username</span></a></div></div></div><div><button class="Accordion__SectionButton-i8yhwx-0 dsecBh">configuring-npm</button><div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/folders">folders<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Folder Structures Used by npm</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/install">install<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Download and install node and npm</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/npmrc">npmrc<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">The npm config 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iPgskl" href="../../using-npm/registry">registry<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">The JavaScript Package Registry</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/removal">removal<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Cleaning the Slate</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/scope">scope<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Scoped packages</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/scripts">scripts<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">How npm handles the "scripts" field</span></a></div></div></div></nav><style data-emotion-css="16vu25q">.css-16vu25q{box-sizing:border-box;margin:0;min-width:0;width:100%;}</style><div class="css-16vu25q"><div class="Page__Content-sc-4b62ym-0 gJQTGP documentation"><div><h1 id="semver7----the-semantic-versioner-for-npm" style="position:relative;"><a href="#semver7----the-semantic-versioner-for-npm" aria-label="semver7 the semantic versioner for npm permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>semver(7) -- The semantic versioner for npm</h1>
<h2 id="install" style="position:relative;"><a href="#install" aria-label="install permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Install</h2>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash"><span class="token function">npm</span> <span class="token function">install</span> --save semver</code></pre></div>
<h2 id="usage" style="position:relative;"><a href="#usage" aria-label="usage permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Usage</h2>
<p>As a node module:</p>
<div class="gatsby-highlight" data-language="js"><pre class="language-js"><code class="language-js"><span class="token keyword">const</span> semver <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'semver'</span><span class="token punctuation">)</span>
semver<span class="token punctuation">.</span><span class="token function">valid</span><span class="token punctuation">(</span><span class="token string">'1.2.3'</span><span class="token punctuation">)</span> <span class="token comment">// '1.2.3'</span>
semver<span class="token punctuation">.</span><span class="token function">valid</span><span class="token punctuation">(</span><span class="token string">'a.b.c'</span><span class="token punctuation">)</span> <span class="token comment">// null</span>
semver<span class="token punctuation">.</span><span class="token function">clean</span><span class="token punctuation">(</span><span class="token string">' =v1.2.3 '</span><span class="token punctuation">)</span> <span class="token comment">// '1.2.3'</span>
semver<span class="token punctuation">.</span><span class="token function">satisfies</span><span class="token punctuation">(</span><span class="token string">'1.2.3'</span><span class="token punctuation">,</span> <span class="token string">'1.x || >=2.5.0 || 5.0.0 - 7.2.3'</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
semver<span class="token punctuation">.</span><span class="token function">gt</span><span class="token punctuation">(</span><span class="token string">'1.2.3'</span><span class="token punctuation">,</span> <span class="token string">'9.8.7'</span><span class="token punctuation">)</span> <span class="token comment">// false</span>
semver<span class="token punctuation">.</span><span class="token function">lt</span><span class="token punctuation">(</span><span class="token string">'1.2.3'</span><span class="token punctuation">,</span> <span class="token string">'9.8.7'</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
semver<span class="token punctuation">.</span><span class="token function">minVersion</span><span class="token punctuation">(</span><span class="token string">'>=1.0.0'</span><span class="token punctuation">)</span> <span class="token comment">// '1.0.0'</span>
semver<span class="token punctuation">.</span><span class="token function">valid</span><span class="token punctuation">(</span>semver<span class="token punctuation">.</span><span class="token function">coerce</span><span class="token punctuation">(</span><span class="token string">'v2'</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// '2.0.0'</span>
semver<span class="token punctuation">.</span><span class="token function">valid</span><span class="token punctuation">(</span>semver<span class="token punctuation">.</span><span class="token function">coerce</span><span class="token punctuation">(</span><span class="token string">'42.6.7.9.3-alpha'</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// '42.6.7'</span></code></pre></div>
<p>As a command-line utility:</p>
<div class="gatsby-highlight" data-language="text"><pre class="language-text"><code class="language-text">$ semver -h
A JavaScript implementation of the https://semver.org/ specification
Copyright Isaac Z. Schlueter
Usage: semver [options] <version> [<version> [...]]
Prints valid versions sorted by SemVer precedence
Options:
-r --range <range>
Print versions that match the specified range.
-i --increment [<level>]
Increment a version by the specified level. Level can
be one of: major, minor, patch, premajor, preminor,
prepatch, or prerelease. Default level is 'patch'.
Only one version may be specified.
--preid <identifier>
Identifier to be used to prefix premajor, preminor,
prepatch or prerelease version increments.
-l --loose
Interpret versions and ranges loosely
-p --include-prerelease
Always include prerelease versions in range matching
-c --coerce
Coerce a string into SemVer if possible
(does not imply --loose)
Program exits successfully if any valid version satisfies
all supplied ranges, and prints all satisfying versions.
If no satisfying versions are found, then exits failure.
Versions are printed in ascending order, so supplying
multiple versions to the utility will just sort them.</code></pre></div>
<h2 id="versions" style="position:relative;"><a href="#versions" aria-label="versions permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Versions</h2>
<p>A "version" is described by the <code class="language-text">v2.0.0</code> specification found at
<a href="https://semver.org/">https://semver.org/</a>.</p>
<p>A leading <code class="language-text">"="</code> or <code class="language-text">"v"</code> character is stripped off and ignored.</p>
<h2 id="ranges" style="position:relative;"><a href="#ranges" aria-label="ranges permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ranges</h2>
<p>A <code class="language-text">version range</code> is a set of <code class="language-text">comparators</code> which specify versions
that satisfy the range.</p>
<p>A <code class="language-text">comparator</code> is composed of an <code class="language-text">operator</code> and a <code class="language-text">version</code>. The set
of primitive <code class="language-text">operators</code> is:</p>
<ul>
<li><code class="language-text"><</code> Less than</li>
<li><code class="language-text"><=</code> Less than or equal to</li>
<li><code class="language-text">></code> Greater than</li>
<li><code class="language-text">>=</code> Greater than or equal to</li>
<li><code class="language-text">=</code> Equal. If no operator is specified, then equality is assumed,
so this operator is optional, but MAY be included.</li>
</ul>
<p>For example, the comparator <code class="language-text">>=1.2.7</code> would match the versions
<code class="language-text">1.2.7</code>, <code class="language-text">1.2.8</code>, <code class="language-text">2.5.3</code>, and <code class="language-text">1.3.9</code>, but not the versions <code class="language-text">1.2.6</code>
or <code class="language-text">1.1.0</code>.</p>
<p>Comparators can be joined by whitespace to form a <code class="language-text">comparator set</code>,
which is satisfied by the <strong>intersection</strong> of all of the comparators
it includes.</p>
<p>A range is composed of one or more comparator sets, joined by <code class="language-text">||</code>. A
version matches a range if and only if every comparator in at least
one of the <code class="language-text">||</code>-separated comparator sets is satisfied by the version.</p>
<p>For example, the range <code class="language-text">>=1.2.7 <1.3.0</code> would match the versions
<code class="language-text">1.2.7</code>, <code class="language-text">1.2.8</code>, and <code class="language-text">1.2.99</code>, but not the versions <code class="language-text">1.2.6</code>, <code class="language-text">1.3.0</code>,
or <code class="language-text">1.1.0</code>.</p>
<p>The range <code class="language-text">1.2.7 || >=1.2.9 <2.0.0</code> would match the versions <code class="language-text">1.2.7</code>,
<code class="language-text">1.2.9</code>, and <code class="language-text">1.4.6</code>, but not the versions <code class="language-text">1.2.8</code> or <code class="language-text">2.0.0</code>.</p>
<h3 id="prerelease-tags" style="position:relative;"><a href="#prerelease-tags" aria-label="prerelease tags permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prerelease Tags</h3>
<p>If a version has a prerelease tag (for example, <code class="language-text">1.2.3-alpha.3</code>) then
it will only be allowed to satisfy comparator sets if at least one
comparator with the same <code class="language-text">[major, minor, patch]</code> tuple also has a
prerelease tag.</p>
<p>For example, the range <code class="language-text">>1.2.3-alpha.3</code> would be allowed to match the
version <code class="language-text">1.2.3-alpha.7</code>, but it would <em>not</em> be satisfied by
<code class="language-text">3.4.5-alpha.9</code>, even though <code class="language-text">3.4.5-alpha.9</code> is technically "greater
than" <code class="language-text">1.2.3-alpha.3</code> according to the SemVer sort rules. The version
range only accepts prerelease tags on the <code class="language-text">1.2.3</code> version. The
version <code class="language-text">3.4.5</code> <em>would</em> satisfy the range, because it does not have a
prerelease flag, and <code class="language-text">3.4.5</code> is greater than <code class="language-text">1.2.3-alpha.7</code>.</p>
<p>The purpose for this behavior is twofold. First, prerelease versions
frequently are updated very quickly, and contain many breaking changes
that are (by the author's design) not yet fit for public consumption.
Therefore, by default, they are excluded from range matching
semantics.</p>
<p>Second, a user who has opted into using a prerelease version has
clearly indicated the intent to use <em>that specific</em> set of
alpha/beta/rc versions. By including a prerelease tag in the range,
the user is indicating that they are aware of the risk. However, it
is still not appropriate to assume that they have opted into taking a
similar risk on the <em>next</em> set of prerelease versions.</p>
<p>Note that this behavior can be suppressed (treating all prerelease
versions as if they were normal versions, for the purpose of range
matching) by setting the <code class="language-text">includePrerelease</code> flag on the options
object to any
<a href="https://github.com/npm/node-semver#functions">functions</a> that do
range matching.</p>
<h4 id="prerelease-identifiers" style="position:relative;"><a href="#prerelease-identifiers" aria-label="prerelease identifiers permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Prerelease Identifiers</h4>
<p>The method <code class="language-text">.inc</code> takes an additional <code class="language-text">identifier</code> string argument that
will append the value of the string as a prerelease identifier:</p>
<div class="gatsby-highlight" data-language="javascript"><pre class="language-javascript"><code class="language-javascript">semver<span class="token punctuation">.</span><span class="token function">inc</span><span class="token punctuation">(</span><span class="token string">'1.2.3'</span><span class="token punctuation">,</span> <span class="token string">'prerelease'</span><span class="token punctuation">,</span> <span class="token string">'beta'</span><span class="token punctuation">)</span>
<span class="token comment">// '1.2.4-beta.0'</span></code></pre></div>
<p>command-line example:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">$ semver <span class="token number">1.2</span>.3 -i prerelease --preid beta
<span class="token number">1.2</span>.4-beta.0</code></pre></div>
<p>Which then can be used to increment further:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">$ semver <span class="token number">1.2</span>.4-beta.0 -i prerelease
<span class="token number">1.2</span>.4-beta.1</code></pre></div>
<h3 id="advanced-range-syntax" style="position:relative;"><a href="#advanced-range-syntax" aria-label="advanced range syntax permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Advanced Range Syntax</h3>
<p>Advanced range syntax desugars to primitive comparators in
deterministic ways.</p>
<p>Advanced ranges may be combined in the same way as primitive
comparators using white space or <code class="language-text">||</code>.</p>
<h4 id="hyphen-ranges-xyz---abc" style="position:relative;"><a href="#hyphen-ranges-xyz---abc" aria-label="hyphen ranges xyz abc permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Hyphen Ranges <code class="language-text">X.Y.Z - A.B.C</code></h4>
<p>Specifies an inclusive set.</p>
<ul>
<li><code class="language-text">1.2.3 - 2.3.4</code> := <code class="language-text">>=1.2.3 <=2.3.4</code></li>
</ul>
<p>If a partial version is provided as the first version in the inclusive
range, then the missing pieces are replaced with zeroes.</p>
<ul>
<li><code class="language-text">1.2 - 2.3.4</code> := <code class="language-text">>=1.2.0 <=2.3.4</code></li>
</ul>
<p>If a partial version is provided as the second version in the
inclusive range, then all versions that start with the supplied parts
of the tuple are accepted, but nothing that would be greater than the
provided tuple parts.</p>
<ul>
<li><code class="language-text">1.2.3 - 2.3</code> := <code class="language-text">>=1.2.3 <2.4.0</code></li>
<li><code class="language-text">1.2.3 - 2</code> := <code class="language-text">>=1.2.3 <3.0.0</code></li>
</ul>
<h4 id="x-ranges-12x-1x-12-" style="position:relative;"><a href="#x-ranges-12x-1x-12-" aria-label="x ranges 12x 1x 12 permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>X-Ranges <code class="language-text">1.2.x</code> <code class="language-text">1.X</code> <code class="language-text">1.2.*</code> <code class="language-text">*</code></h4>
<p>Any of <code class="language-text">X</code>, <code class="language-text">x</code>, or <code class="language-text">*</code> may be used to "stand in" for one of the
numeric values in the <code class="language-text">[major, minor, patch]</code> tuple.</p>
<ul>
<li><code class="language-text">*</code> := <code class="language-text">>=0.0.0</code> (Any version satisfies)</li>
<li><code class="language-text">1.x</code> := <code class="language-text">>=1.0.0 <2.0.0</code> (Matching major version)</li>
<li><code class="language-text">1.2.x</code> := <code class="language-text">>=1.2.0 <1.3.0</code> (Matching major and minor versions)</li>
</ul>
<p>A partial version range is treated as an X-Range, so the special
character is in fact optional.</p>
<ul>
<li><code class="language-text">""</code> (empty string) := <code class="language-text">*</code> := <code class="language-text">>=0.0.0</code></li>
<li><code class="language-text">1</code> := <code class="language-text">1.x.x</code> := <code class="language-text">>=1.0.0 <2.0.0</code></li>
<li><code class="language-text">1.2</code> := <code class="language-text">1.2.x</code> := <code class="language-text">>=1.2.0 <1.3.0</code></li>
</ul>
<h4 id="tilde-ranges-123-12-1" style="position:relative;"><a href="#tilde-ranges-123-12-1" aria-label="tilde ranges 123 12 1 permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Tilde Ranges <code class="language-text">~1.2.3</code> <code class="language-text">~1.2</code> <code class="language-text">~1</code></h4>
<p>Allows patch-level changes if a minor version is specified on the
comparator. Allows minor-level changes if not.</p>
<ul>
<li><code class="language-text">~1.2.3</code> := <code class="language-text">>=1.2.3 <1.(2+1).0</code> := <code class="language-text">>=1.2.3 <1.3.0</code></li>
<li><code class="language-text">~1.2</code> := <code class="language-text">>=1.2.0 <1.(2+1).0</code> := <code class="language-text">>=1.2.0 <1.3.0</code> (Same as <code class="language-text">1.2.x</code>)</li>
<li><code class="language-text">~1</code> := <code class="language-text">>=1.0.0 <(1+1).0.0</code> := <code class="language-text">>=1.0.0 <2.0.0</code> (Same as <code class="language-text">1.x</code>)</li>
<li><code class="language-text">~0.2.3</code> := <code class="language-text">>=0.2.3 <0.(2+1).0</code> := <code class="language-text">>=0.2.3 <0.3.0</code></li>
<li><code class="language-text">~0.2</code> := <code class="language-text">>=0.2.0 <0.(2+1).0</code> := <code class="language-text">>=0.2.0 <0.3.0</code> (Same as <code class="language-text">0.2.x</code>)</li>
<li><code class="language-text">~0</code> := <code class="language-text">>=0.0.0 <(0+1).0.0</code> := <code class="language-text">>=0.0.0 <1.0.0</code> (Same as <code class="language-text">0.x</code>)</li>
<li><code class="language-text">~1.2.3-beta.2</code> := <code class="language-text">>=1.2.3-beta.2 <1.3.0</code> Note that prereleases in
the <code class="language-text">1.2.3</code> version will be allowed, if they are greater than or
equal to <code class="language-text">beta.2</code>. So, <code class="language-text">1.2.3-beta.4</code> would be allowed, but
<code class="language-text">1.2.4-beta.2</code> would not, because it is a prerelease of a
different <code class="language-text">[major, minor, patch]</code> tuple.</li>
</ul>
<h4 id="caret-ranges-123-025-004" style="position:relative;"><a href="#caret-ranges-123-025-004" aria-label="caret ranges 123 025 004 permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Caret Ranges <code class="language-text">^1.2.3</code> <code class="language-text">^0.2.5</code> <code class="language-text">^0.0.4</code></h4>
<p>Allows changes that do not modify the left-most non-zero digit in the
<code class="language-text">[major, minor, patch]</code> tuple. In other words, this allows patch and
minor updates for versions <code class="language-text">1.0.0</code> and above, patch updates for
versions <code class="language-text">0.X >=0.1.0</code>, and <em>no</em> updates for versions <code class="language-text">0.0.X</code>.</p>
<p>Many authors treat a <code class="language-text">0.x</code> version as if the <code class="language-text">x</code> were the major
"breaking-change" indicator.</p>
<p>Caret ranges are ideal when an author may make breaking changes
between <code class="language-text">0.2.4</code> and <code class="language-text">0.3.0</code> releases, which is a common practice.
However, it presumes that there will <em>not</em> be breaking changes between
<code class="language-text">0.2.4</code> and <code class="language-text">0.2.5</code>. It allows for changes that are presumed to be
additive (but non-breaking), according to commonly observed practices.</p>
<ul>
<li><code class="language-text">^1.2.3</code> := <code class="language-text">>=1.2.3 <2.0.0</code></li>
<li><code class="language-text">^0.2.3</code> := <code class="language-text">>=0.2.3 <0.3.0</code></li>
<li><code class="language-text">^0.0.3</code> := <code class="language-text">>=0.0.3 <0.0.4</code></li>
<li><code class="language-text">^1.2.3-beta.2</code> := <code class="language-text">>=1.2.3-beta.2 <2.0.0</code> Note that prereleases in
the <code class="language-text">1.2.3</code> version will be allowed, if they are greater than or
equal to <code class="language-text">beta.2</code>. So, <code class="language-text">1.2.3-beta.4</code> would be allowed, but
<code class="language-text">1.2.4-beta.2</code> would not, because it is a prerelease of a
different <code class="language-text">[major, minor, patch]</code> tuple.</li>
<li><code class="language-text">^0.0.3-beta</code> := <code class="language-text">>=0.0.3-beta <0.0.4</code> Note that prereleases in the
<code class="language-text">0.0.3</code> version <em>only</em> will be allowed, if they are greater than or
equal to <code class="language-text">beta</code>. So, <code class="language-text">0.0.3-pr.2</code> would be allowed.</li>
</ul>
<p>When parsing caret ranges, a missing <code class="language-text">patch</code> value desugars to the
number <code class="language-text">0</code>, but will allow flexibility within that value, even if the
major and minor versions are both <code class="language-text">0</code>.</p>
<ul>
<li><code class="language-text">^1.2.x</code> := <code class="language-text">>=1.2.0 <2.0.0</code></li>
<li><code class="language-text">^0.0.x</code> := <code class="language-text">>=0.0.0 <0.1.0</code></li>
<li><code class="language-text">^0.0</code> := <code class="language-text">>=0.0.0 <0.1.0</code></li>
</ul>
<p>A missing <code class="language-text">minor</code> and <code class="language-text">patch</code> values will desugar to zero, but also
allow flexibility within those values, even if the major version is
zero.</p>
<ul>
<li><code class="language-text">^1.x</code> := <code class="language-text">>=1.0.0 <2.0.0</code></li>
<li><code class="language-text">^0.x</code> := <code class="language-text">>=0.0.0 <1.0.0</code></li>
</ul>
<h3 id="range-grammar" style="position:relative;"><a href="#range-grammar" aria-label="range grammar permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Range Grammar</h3>
<p>Putting all this together, here is a Backus-Naur grammar for ranges,
for the benefit of parser authors:</p>
<div class="gatsby-highlight" data-language="bnf"><pre class="language-bnf"><code class="language-bnf">range-set <span class="token operator">::=</span> range <span class="token operator">(</span> logical-or range <span class="token operator">)</span> <span class="token operator">*</span>
logical-or <span class="token operator">::=</span> <span class="token operator">(</span> <span class="token string">' '</span> <span class="token operator">)</span> <span class="token operator">*</span> <span class="token string">'||'</span> <span class="token operator">(</span> <span class="token string">' '</span> <span class="token operator">)</span> <span class="token operator">*</span>
range <span class="token operator">::=</span> hyphen <span class="token operator">|</span> simple <span class="token operator">(</span> <span class="token string">' '</span> simple <span class="token operator">)</span> <span class="token operator">*</span> <span class="token operator">|</span> <span class="token string">''</span>
hyphen <span class="token operator">::=</span> partial <span class="token string">' - '</span> partial
simple <span class="token operator">::=</span> primitive <span class="token operator">|</span> partial <span class="token operator">|</span> tilde <span class="token operator">|</span> caret
primitive <span class="token operator">::=</span> <span class="token operator">(</span> <span class="token string">'<'</span> <span class="token operator">|</span> <span class="token string">'>'</span> <span class="token operator">|</span> <span class="token string">'>='</span> <span class="token operator">|</span> <span class="token string">'<='</span> <span class="token operator">|</span> <span class="token string">'='</span> <span class="token operator">)</span> partial
partial <span class="token operator">::=</span> xr <span class="token operator">(</span> <span class="token string">'.'</span> xr <span class="token operator">(</span> <span class="token string">'.'</span> xr qualifier <span class="token operator">?</span> <span class="token operator">)</span><span class="token operator">?</span> <span class="token operator">)</span><span class="token operator">?</span>
xr <span class="token operator">::=</span> <span class="token string">'x'</span> <span class="token operator">|</span> <span class="token string">'X'</span> <span class="token operator">|</span> <span class="token string">'*'</span> <span class="token operator">|</span> nr
nr <span class="token operator">::=</span> <span class="token string">'0'</span> <span class="token operator">|</span> <span class="token operator">[</span><span class="token string">'1'</span>-<span class="token string">'9'</span><span class="token operator">]</span> <span class="token operator">(</span> <span class="token operator">[</span><span class="token string">'0'</span>-<span class="token string">'9'</span><span class="token operator">]</span> <span class="token operator">)</span> <span class="token operator">*</span>
tilde <span class="token operator">::=</span> <span class="token string">'~'</span> partial
caret <span class="token operator">::=</span> <span class="token string">'^'</span> partial
qualifier <span class="token operator">::=</span> <span class="token operator">(</span> <span class="token string">'-'</span> pre <span class="token operator">)</span><span class="token operator">?</span> <span class="token operator">(</span> <span class="token string">'+'</span> build <span class="token operator">)</span><span class="token operator">?</span>
pre <span class="token operator">::=</span> parts
build <span class="token operator">::=</span> parts
parts <span class="token operator">::=</span> part <span class="token operator">(</span> <span class="token string">'.'</span> part <span class="token operator">)</span> <span class="token operator">*</span>
part <span class="token operator">::=</span> nr <span class="token operator">|</span> <span class="token operator">[</span>-0-9A-Za-z<span class="token operator">]</span><span class="token operator">+</span></code></pre></div>
<h2 id="functions" style="position:relative;"><a href="#functions" aria-label="functions permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Functions</h2>
<p>All methods and classes take a final <code class="language-text">options</code> object argument. All
options in this object are <code class="language-text">false</code> by default. The options supported
are:</p>
<ul>
<li><code class="language-text">loose</code> Be more forgiving about not-quite-valid semver strings.
(Any resulting output will always be 100% strict compliant, of
course.) For backwards compatibility reasons, if the <code class="language-text">options</code>
argument is a boolean value instead of an object, it is interpreted
to be the <code class="language-text">loose</code> param.</li>
<li><code class="language-text">includePrerelease</code> Set to suppress the <a href="https://github.com/npm/node-semver#prerelease-tags">default
behavior</a> of
excluding prerelease tagged versions from ranges unless they are
explicitly opted into.</li>
</ul>
<p>Strict-mode Comparators and Ranges will be strict about the SemVer
strings that they parse.</p>
<ul>
<li><code class="language-text">valid(v)</code>: Return the parsed version, or null if it's not valid.</li>
<li>
<p><code class="language-text">inc(v, release)</code>: Return the version incremented by the release
type (<code class="language-text">major</code>, <code class="language-text">premajor</code>, <code class="language-text">minor</code>, <code class="language-text">preminor</code>, <code class="language-text">patch</code>,
<code class="language-text">prepatch</code>, or <code class="language-text">prerelease</code>), or null if it's not valid</p>
<ul>
<li><code class="language-text">premajor</code> in one call will bump the version up to the next major
version and down to a prerelease of that major version.
<code class="language-text">preminor</code>, and <code class="language-text">prepatch</code> work the same way.</li>
<li>If called from a non-prerelease version, the <code class="language-text">prerelease</code> will work the
same as <code class="language-text">prepatch</code>. It increments the patch version, then makes a
prerelease. If the input version is already a prerelease it simply
increments it.</li>
</ul>
</li>
<li><code class="language-text">prerelease(v)</code>: Returns an array of prerelease components, or null
if none exist. Example: <code class="language-text">prerelease('1.2.3-alpha.1') -> ['alpha', 1]</code></li>
<li><code class="language-text">major(v)</code>: Return the major version number.</li>
<li><code class="language-text">minor(v)</code>: Return the minor version number.</li>
<li><code class="language-text">patch(v)</code>: Return the patch version number.</li>
<li><code class="language-text">intersects(r1, r2, loose)</code>: Return true if the two supplied ranges
or comparators intersect.</li>
<li><code class="language-text">parse(v)</code>: Attempt to parse a string as a semantic version, returning either
a <code class="language-text">SemVer</code> object or <code class="language-text">null</code>.</li>
</ul>
<h3 id="comparison" style="position:relative;"><a href="#comparison" aria-label="comparison permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Comparison</h3>
<ul>
<li><code class="language-text">gt(v1, v2)</code>: <code class="language-text">v1 > v2</code></li>
<li><code class="language-text">gte(v1, v2)</code>: <code class="language-text">v1 >= v2</code></li>
<li><code class="language-text">lt(v1, v2)</code>: <code class="language-text">v1 < v2</code></li>
<li><code class="language-text">lte(v1, v2)</code>: <code class="language-text">v1 <= v2</code></li>
<li><code class="language-text">eq(v1, v2)</code>: <code class="language-text">v1 == v2</code> This is true if they're logically equivalent,
even if they're not the exact same string. You already know how to
compare strings.</li>
<li><code class="language-text">neq(v1, v2)</code>: <code class="language-text">v1 != v2</code> The opposite of <code class="language-text">eq</code>.</li>
<li><code class="language-text">cmp(v1, comparator, v2)</code>: Pass in a comparison string, and it'll call
the corresponding function above. <code class="language-text">"==="</code> and <code class="language-text">"!=="</code> do simple
string comparison, but are included for completeness. Throws if an
invalid comparison string is provided.</li>
<li><code class="language-text">compare(v1, v2)</code>: Return <code class="language-text">0</code> if <code class="language-text">v1 == v2</code>, or <code class="language-text">1</code> if <code class="language-text">v1</code> is greater, or <code class="language-text">-1</code> if
<code class="language-text">v2</code> is greater. Sorts in ascending order if passed to <code class="language-text">Array.sort()</code>.</li>
<li><code class="language-text">rcompare(v1, v2)</code>: The reverse of compare. Sorts an array of versions
in descending order when passed to <code class="language-text">Array.sort()</code>.</li>
<li><code class="language-text">diff(v1, v2)</code>: Returns difference between two versions by the release type
(<code class="language-text">major</code>, <code class="language-text">premajor</code>, <code class="language-text">minor</code>, <code class="language-text">preminor</code>, <code class="language-text">patch</code>, <code class="language-text">prepatch</code>, or <code class="language-text">prerelease</code>),
or null if the versions are the same.</li>
</ul>
<h3 id="comparators" style="position:relative;"><a href="#comparators" aria-label="comparators permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Comparators</h3>
<ul>
<li><code class="language-text">intersects(comparator)</code>: Return true if the comparators intersect</li>
</ul>
<h3 id="ranges-1" style="position:relative;"><a href="#ranges-1" aria-label="ranges 1 permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Ranges</h3>
<ul>
<li><code class="language-text">validRange(range)</code>: Return the valid range or null if it's not valid</li>
<li><code class="language-text">satisfies(version, range)</code>: Return true if the version satisfies the
range.</li>
<li><code class="language-text">maxSatisfying(versions, range)</code>: Return the highest version in the list
that satisfies the range, or <code class="language-text">null</code> if none of them do.</li>
<li><code class="language-text">minSatisfying(versions, range)</code>: Return the lowest version in the list
that satisfies the range, or <code class="language-text">null</code> if none of them do.</li>
<li><code class="language-text">minVersion(range)</code>: Return the lowest version that can possibly match
the given range.</li>
<li><code class="language-text">gtr(version, range)</code>: Return <code class="language-text">true</code> if version is greater than all the
versions possible in the range.</li>
<li><code class="language-text">ltr(version, range)</code>: Return <code class="language-text">true</code> if version is less than all the
versions possible in the range.</li>
<li><code class="language-text">outside(version, range, hilo)</code>: Return true if the version is outside
the bounds of the range in either the high or low direction. The
<code class="language-text">hilo</code> argument must be either the string <code class="language-text">'>'</code> or <code class="language-text">'<'</code>. (This is
the function called by <code class="language-text">gtr</code> and <code class="language-text">ltr</code>.)</li>
<li><code class="language-text">intersects(range)</code>: Return true if any of the ranges comparators intersect</li>
</ul>
<p>Note that, since ranges may be non-contiguous, a version might not be
greater than a range, less than a range, <em>or</em> satisfy a range! For
example, the range <code class="language-text">1.2 <1.2.9 || >2.0.0</code> would have a hole from <code class="language-text">1.2.9</code>
until <code class="language-text">2.0.0</code>, so the version <code class="language-text">1.2.10</code> would not be greater than the
range (because <code class="language-text">2.0.1</code> satisfies, which is higher), nor less than the
range (since <code class="language-text">1.2.8</code> satisfies, which is lower), and it also does not
satisfy the range.</p>
<p>If you want to know if a version satisfies or does not satisfy a
range, use the <code class="language-text">satisfies(version, range)</code> function.</p>
<h3 id="coercion" style="position:relative;"><a href="#coercion" aria-label="coercion permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Coercion</h3>
<ul>
<li><code class="language-text">coerce(version)</code>: Coerces a string to semver if possible</li>
</ul>
<p>This aims to provide a very forgiving translation of a non-semver string to
semver. It looks for the first digit in a string, and consumes all
remaining characters which satisfy at least a partial semver (e.g., <code class="language-text">1</code>,
<code class="language-text">1.2</code>, <code class="language-text">1.2.3</code>) up to the max permitted length (256 characters). Longer
versions are simply truncated (<code class="language-text">4.6.3.9.2-alpha2</code> becomes <code class="language-text">4.6.3</code>). All
surrounding text is simply ignored (<code class="language-text">v3.4 replaces v3.3.1</code> becomes
<code class="language-text">3.4.0</code>). Only text which lacks digits will fail coercion (<code class="language-text">version one</code>
is not valid). The maximum length for any semver component considered for
coercion is 16 characters; longer components will be ignored
(<code class="language-text">10000000000000000.4.7.4</code> becomes <code class="language-text">4.7.4</code>). The maximum value for any
semver component is <code class="language-text">Number.MAX_SAFE_INTEGER || (2**53 - 1)</code>; higher value
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