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node_modules/@vue/cli-shared-utils/lib/launch.js

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+const launch = require('launch-editor')
+
+exports.launch = (...args) => {
+  const file = args[0]
+  console.log(`Opening ${file}...`)
+  let cb = args[args.length - 1]
+  if (typeof cb !== 'function') {
+    cb = null
+  }
+  launch(...args, (fileName, errorMessage) => {
+    console.error(`Unable to open '${fileName}'`, errorMessage)
+    console.log(`Try setting the EDITOR env variable. More info: https://github.com/yyx990803/launch-editor`)
+
+    if (cb) cb(fileName, errorMessage)
+  })
+}