Saving all progress

node_modules/why-is-node-running/index.js

@@ -0,0 +1,67 @@
+var asyncHooks = require('async_hooks')
+var stackback = require('stackback')
+var path = require('path')
+var fs = require('fs')
+var sep = path.sep
+
+var active = new Map()
+var hook = asyncHooks.createHook({
+  init (asyncId, type, triggerAsyncId, resource) {
+    if (type === 'TIMERWRAP' || type === 'PROMISE') return
+    if (type === 'PerformanceObserver' || type === 'RANDOMBYTESREQUEST') return
+    var err = new Error('whatevs')
+    var stacks = stackback(err)
+    active.set(asyncId, {type, stacks, resource})
+  },
+  destroy (asyncId) {
+    active.delete(asyncId)
+  }
+})
+
+hook.enable()
+module.exports = whyIsNodeRunning
+
+function whyIsNodeRunning (logger) {
+  if (!logger) logger = console
+
+  hook.disable()
+  var activeResources = [...active.values()].filter(function(r) {
+    if (
+      typeof r.resource.hasRef === 'function'
+      && !r.resource.hasRef()
+    ) return false
+    return true
+  })
+
+  logger.error('There are %d handle(s) keeping the process running', activeResources.length)
+  for (const o of activeResources) printStacks(o)
+
+  function printStacks (o) {
+    var stacks = o.stacks.slice(1).filter(function (s) {
+      var filename = s.getFileName()
+      return filename && filename.indexOf(sep) > -1 && filename.indexOf('internal' + sep) !== 0 && filename.indexOf('node:internal' + sep) !== 0
+    })
+
+    logger.error('')
+    logger.error('# %s', o.type)
+
+    if (!stacks[0]) {
+      logger.error('(unknown stack trace)')
+    } else {
+      var padding = ''
+      stacks.forEach(function (s) {
+        var pad = (s.getFileName() + ':' + s.getLineNumber()).replace(/./g, ' ')
+        if (pad.length > padding.length) padding = pad
+      })
+      stacks.forEach(function (s) {
+        var prefix = s.getFileName() + ':' + s.getLineNumber()
+        try {
+          var src = fs.readFileSync(s.getFileName(), 'utf-8').split(/\n|\r\n/)
+          logger.error(prefix + padding.slice(prefix.length) + ' - ' + src[s.getLineNumber() - 1].trim())
+        } catch (e) {
+          logger.error(prefix + padding.slice(prefix.length))
+        }
+      })
+    }
+  }
+}