Duplicate plugin/preset detected when running the coverage

[srini88]

Hello,

When I'm running COVERAGE=true ember test inside my addon directory, I'm encountering the below error

Build Error (broccoli-persistent-filter:Babel > [Babel: context]) in context/actions/context-creators.js

Duplicate plugin/preset detected.
If you'd like to use two separate instances of a plugin,
they need separate names, e.g.

  plugins: [
    ['some-plugin', {}],
    ['some-plugin', {}, 'some unique name'],
  ]

    at assertNoDuplicates (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-descriptors.js:205:13)
    at createDescriptors (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-descriptors.js:114:3)
    at createPluginDescriptors (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-descriptors.js:105:10)
    at alias (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-descriptors.js:63:49)
    at cachedFunction (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/caching.js:33:19)
    at plugins.plugins (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-descriptors.js:28:77)
    at mergeChainOpts (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-chain.js:319:26)
    at /home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-chain.js:283:7
    at buildRootChain (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/config-chain.js:68:29)
    at loadPrivatePartialConfig (/home/sv/workspace/pvs/node_modules/@babel/core/lib/config/partial.js:85:55)


Stack Trace and Error Report: /tmp/error.dump.1255fbe0311d73a7e380da092b925705.log

The stack trace does not have any useful information. I found this PR ember-m3/ember-m3#386 and babel/babel#10419 and tried to console log the conflicts in the file packages/babel-core/src/config/config-descriptors.js. It printed name as undefined and I was not able to figure out which plugin is causing the conflict.

Buildingconflicts: [ { name: undefined,
    alias: 'base$14',
    value: { [Function] baseDir: [Function] },
    options: { exclude: [Array], include: [Array] },
    dirname:
     '/home/Desktop/Projects/code/admin-source-management',
    ownPass: false,
    file: undefined },
  { name: undefined,
    alias: 'base$15',
    value: { [Function] baseDir: [Function] },
    options: { exclude: [Array], include: [Array] },
    dirname:
     '/home/Desktop/Projects/code/admin-source-management',
    ownPass: false,
    file: undefined },
  { name: undefined,
    alias: 'base$16',
    value: { [Function] baseDir: [Function] },
    options: { exclude: [Array], include: [Array] },
    dirname:
     '/home/Desktop/Projects/code/admin-source-management',
    ownPass: false,
    file: undefined } ]

Environment

• Babel version(s): 7.9.0
• Node/npm version: Node 10.15.3/npm 6.4.1

[srini88]

@kategengler any thoughts on this?

[benwalder]

upgrade to v1 beta 8 fixed this for me

[srini88]

ember-cli-htmlbars was the culprit for me. ember-cli/ember-cli-htmlbars#297

This issue is fixed after upgrading ember-cli-htmlbars to 4.0.5.