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    <title>Code coverage report for tar/lib/update.js</title>
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      <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> update.js
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
// tar -u
&nbsp;
const hlo = require('./high-level-opt.js')
const r = require('./replace.js')
// just call tar.r with the filter and mtimeCache
&nbsp;
const u = module.exports = (opt_, files, cb) =&gt; {
  const opt = hlo(opt_)
&nbsp;
  if (!opt.file)
    throw new TypeError('file is required')
&nbsp;
  if (opt.gzip)
    throw new TypeError('cannot append to compressed archives')
&nbsp;
  if (!files || !Array.isArray(files) || !files.length)
    throw new TypeError('no files or directories specified')
&nbsp;
  files = Array.from(files)
&nbsp;
  mtimeFilter(opt)
  return r(opt, files, cb)
}
&nbsp;
const mtimeFilter = opt =&gt; {
  const filter = opt.filter
&nbsp;
  if (!opt.mtimeCache)
    opt.mtimeCache = new Map()
&nbsp;
  opt.filter = filter ? (path, stat) =&gt;
    filter(path, stat) &amp;&amp; !(opt.mtimeCache.get(path) &gt; stat.mtime)
    : (path, stat) =&gt; !(opt.mtimeCache.get(path) &gt; stat.mtime)
}
&nbsp;</pre></td></tr>
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