deep-destructure instrumentation bug

[osher]

Scenario

Consider the following snippet:

module.exports = function serverFactory(ioc) {
    const {
      events: { EventEmitter } = require('events')
    , destroyable              = require('server-destroy')
    , serverPromise            = require('./web/server')
    , logger
    , args
    } = ioc
   /*
     ...
   */
}

The module exports a factory that expects an inversion-of-control context, and extracts from it what it needs using a deep destructure. The code runs well and passes tests.

expected

Coverage should pass the same like the tests do

found

Using the same tests for coverage fails because instrumented it looks (when beautified a little) like so:

module.exports = function serverFactory(ctx){
  __cov_gAjmS2LR4S03hyyjcVwIug.f['1']++;
  __cov_gAjmS2LR4S03hyyjcVwIug.s['2']++;
  const {
    {EventEmitter}=require('events'):{EventEmitter}=require('events'),
    destroyable=require('server-destroy'),
    serverPromise=require('./web/server'),
    logger,
    args
  } = ctx;
  __cov_gAjmS2LR4S03hyyjcVwIug.s['3']++;
  /**
   ...
  */
}

raw:

__cov_gAjmS2LR4S03hyyjcVwIug.s['1']++;module.exports=function serverFactory(ctx){__cov_gAjmS2LR4S03hyyjcVwIug.f['1']++;__cov_gAjmS2LR4S03hyyjcVwIug.s['2']++;const {{EventEmitter}=require('events'):{EventEmitter}=require('events'),destroyable=require('server-destroy'),serverPromise=require('./web/server'),logger,args}=ctx;__cov_gAjmS2LR4S03hyyjcVwIug.s['3']++;};