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Path error with SLS 1.18 when package individually is set

See original GitHub issue

This is a Bug Report

Description

I have a few services in the same project, so I made a script to gather the and deploy them one by one. On my machine everything goes fine, but when I run it on AWS CodeBuild, our CI, it fails.

projects.forEach(project => {
  console.info('Deploying', project);
  child_process.exec(`sls deploy`, { cwd: join(srcFolder, project) }, (err, stdout, stderr) => {
    if (err) {
      console.log('Error!', err);
    } else {
      console.log('STDOUT:', stdout);
      console.log('STDERR:', stderr);
      console.info('Finished', project);
    }
  });
});

And here is the error:

TypeError: Path must be a string. Received undefined
at assertPath (path.js:7:11)
at Object.basename (path.js:1357:5)
at functionNames.forEach.name (/codebuild/output/src838467009/src/node_modules/serverless-webpack/lib/cleanup.js:27:28)
at Array.forEach (native)
at fse.copy (/codebuild/output/src838467009/src/node_modules/serverless-webpack/lib/cleanup.js:23:31)
at doneOne (/codebuild/output/src838467009/src/node_modules/fs-extra/lib/copy/ncp.js:237:40)
at /codebuild/output/src838467009/src/node_modules/fs-extra/lib/copy/ncp.js:122:11
at /codebuild/output/src838467009/src/node_modules/graceful-fs/polyfills.js:239:18
at FSReqWrap.oncomplete (fs.js:123:15)

at ChildProcess.exithandler (child_process.js:202:12)
at emitTwo (events.js:106:13)
at ChildProcess.emit (events.js:191:7)
at maybeClose (internal/child_process.js:852:16)
at Process.ChildProcess._handle.onexit (internal/child_process.js:215:5) killed: false, code: 1, signal: null, cmd: 'sls deploy' }