@lerna/conventional-commits unable to use conventional-changelog-conventionalcommits

Expected Behavior

Should be able to run

$ lerna version prerelease`

with the config

{
  "command": {
    "version": {
      "conventionalCommits": true,
      "changelogPreset": "conventional-changelog-conventionalcommits",
    }
  }
}

successfully.

Current Behavior

It terminates without any error message:

[munif:/<dir>/<repo>] master ± lerna version prerelease --yes --loglevel=silly -m "chore: msg"
lerna sill argv { _: [ 'version' ],
lerna sill argv   yes: true,
lerna sill argv   y: true,
lerna sill argv   loglevel: 'silly',
lerna sill argv   m: 'chore: msg',
lerna sill argv   message: 'chore: msg',
lerna sill argv   lernaVersion: '3.13.4',
lerna sill argv   '$0': 'node_modules/.bin/lerna',
lerna sill argv   bump: 'prerelease' }
lerna notice cli v3.13.4
lerna verb rootPath /<dir>/<repo>
lerna info versioning independent
lerna sill isAnythingCommitted 
lerna verb isAnythingCommitted 1
lerna sill currentBranch 
lerna verb currentBranch master
lerna sill hasTags 
lerna verb hasTags false
lerna info Assuming all packages changed
lerna verb updated @<scope>/<pkg1>
lerna verb updated @<scope>/<pkg2>
lerna verb updated @<scope>/<pkg3>
lerna info version Skipping unversioned private package "@<scope>/<pkg3>"
lerna verb git-describe undefined => "5b18165"
lerna sill git-describe parsed => {"refCount":"7","sha":"5b18165","isDirty":false}
lerna sill batched [ PackageGraphNode {
lerna sill batched     name: '@<scope>/<pkg1>',
lerna sill batched     externalDependencies: Map { '<dep>' => [Object] },
lerna sill batched     localDependencies: Map {},
lerna sill batched     localDependents: Map { '@<scope>/<pkg2>' => [PackageGraphNode] } } ]
lerna sill batched [ PackageGraphNode {
lerna sill batched     name: '@<scope>/<pkg2>',
lerna sill batched     externalDependencies: Map {},
lerna sill batched     localDependencies: Map {},
lerna sill batched     localDependents: Map {} } ]

Changes:
 - @<scope>/<pkg1>: 0.0.0 => 0.0.1-alpha.0
 - @<scope>/<pkg2>: 0.0.0 => 0.0.1-alpha.0

lerna info auto-confirmed 
lerna info execute Skipping git push
lerna info execute Skipping GitHub releases
lerna sill lifecycle No script for "preversion" in "<repo>", continuing
lerna sill lifecycle No script for "preversion" in "@<scope>/<pkg1>", continuing
lerna sill lifecycle No script for "version" in "@<scope>/<pkg1>", continuing
lerna sill independent for @<scope>/<pkg1> at /<dir>/<repo>/packages/<pkg1>
lerna verb getChangelogConfig using preset "conventional-changelog-conventionalcommits"
lerna sill npa { type: 'tag',
lerna sill npa   registry: true,
lerna sill npa   where: undefined,
lerna sill npa   raw: 'conventional-changelog-conventionalcommits',
lerna sill npa   name: 'conventional-changelog-conventionalcommits',
lerna sill npa   escapedName: 'conventional-changelog-conventionalcommits',
lerna sill npa   scope: undefined,
lerna sill npa   rawSpec: '',
lerna sill npa   saveSpec: null,
lerna sill npa   fetchSpec: 'latest',
lerna sill npa   gitRange: undefined,
lerna sill npa   gitCommittish: undefined,
lerna sill npa   hosted: undefined }
lerna verb getChangelogConfig Attempting to resolve preset "conventional-changelog-conventionalcommits"
lerna info getChangelogConfig Successfully resolved preset "conventional-changelog-conventionalcommits"

It just bumps the version on package.json, does nothing else.

Possible Solution

Related to this commit: https://github.com/conventional-changelog/conventional-changelog/commit/f2fb240

Specially this file: https://github.com/conventional-changelog/conventional-changelog/commit/f2fb240#diff-b79ed7f48102a253b716fdde8b9fbcb7

It introduces some new logic to load the presets. But lerna probably uses it’s own custom implementation. 🤔

Context

Wanted to use conventional-changelog-conventionalcommits as command.version.changelogPreset.

Executable	Version
lerna --version	3.13, 3.14, 3.15

[jccr]

If I get rid of this:

https://github.com/lerna/lerna/blob/bb048cb306b5cfcb039aa98f667cf3751cf0ad20/core/conventional-commits/lib/update-changelog.js#L22

it makes it work. Why is lerna trying to ruin the config output by conventional-changelog itself?

It’s true… I’m not getting the expected output from the convetionalcommits preset until I force the "old" preset API branch to execute.

I’m getting some changelog output, but it’s not presented with the proper sections/headings. I’m not seeing ### ⚠ BREAKING CHANGES or ### Features or ### Bug Fixes or ### Code Refactoring. I’m just seeing a flat (naive) list of commits.

[bertho-zero]

@jccr It’s due to this bug: https://github.com/conventional-changelog/conventional-changelog/pull/618