* first action!

node_modules/pacote/prefetch.js

@@ -0,0 +1,64 @@
+'use strict'
+
+const BB = require('bluebird')
+
+const cacache = require('cacache')
+const finished = BB.promisify(require('mississippi').finished)
+const optCheck = require('./lib/util/opt-check')
+const npa = require('npm-package-arg')
+
+module.exports = prefetch
+function prefetch (spec, opts) {
+  opts = optCheck(opts)
+  spec = npa(spec, opts.where)
+  opts.log.warn('prefetch', 'pacote.prefetch() is deprecated. Please use pacote.tarball() instead.')
+  const startTime = Date.now()
+  if (!opts.cache) {
+    opts.log.info('prefetch', 'skipping prefetch: no cache provided')
+    return BB.resolve({ spec })
+  }
+  if (opts.integrity && !opts.preferOnline) {
+    opts.log.silly('prefetch', 'checking if', opts.integrity, 'is already cached')
+    return cacache.get.hasContent(opts.cache, opts.integrity).then(info => {
+      if (info) {
+        opts.log.silly('prefetch', `content already exists for ${spec} (${Date.now() - startTime}ms)`)
+        return {
+          spec,
+          integrity: info.integrity,
+          size: info.size,
+          byDigest: true
+        }
+      } else {
+        return prefetchByManifest(startTime, spec, opts)
+      }
+    })
+  } else {
+    opts.log.silly('prefetch', `no integrity hash provided for ${spec} - fetching by manifest`)
+    return prefetchByManifest(startTime, spec, opts)
+  }
+}
+
+let fetch
+function prefetchByManifest (start, spec, opts) {
+  let manifest
+  let integrity
+  return BB.resolve().then(() => {
+    if (!fetch) {
+      fetch = require('./lib/fetch')
+    }
+    const stream = fetch.tarball(spec, opts)
+    if (!stream) { return }
+    stream.on('data', function () {})
+    stream.on('manifest', m => { manifest = m })
+    stream.on('integrity', i => { integrity = i })
+    return finished(stream)
+  }).then(() => {
+    opts.log.silly('prefetch', `${spec} done in ${Date.now() - start}ms`)
+    return {
+      manifest,
+      spec,
+      integrity: integrity || (manifest && manifest._integrity),
+      byDigest: false
+    }
+  })
+}