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node_modules/which-pm-runs/index.js

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+'use strict'
+
+module.exports = function () {
+  if (!process.env.npm_config_user_agent) {
+    return undefined
+  }
+  return pmFromUserAgent(process.env.npm_config_user_agent)
+}
+
+function pmFromUserAgent (userAgent) {
+  const pmSpec = userAgent.split(' ')[0]
+  const separatorPos = pmSpec.lastIndexOf('/')
+  const name = pmSpec.substring(0, separatorPos)
+  return {
+    name: name === 'npminstall' ? 'cnpm' : name,
+    version: pmSpec.substring(separatorPos + 1)
+  }
+}