package-lock.json</code>.</p>
<p>Note that the file format changed significantly in npm v7 to track
information that would have otherwise required looking in <code>node_modules</code> or
the npm registry.  Lockfiles generated by npm v7 will contain
<code>lockfileVersion: 2</code>.</p>
<ul>
<li>No version provided: an "ancient" shrinkwrap file from a version of npm
prior to npm v5.</li>
<li><code>1</code>: The lockfile version used by npm v5 and v6.</li>
<li><code>2</code>: The lockfile version used by npm v