Path completions for subdirectories not returned when using compilerOptions.path

[mjbvz]

TypeScript Version: 2.7.1

Search Terms:

• Path intellisense
• Path completions

Code

$ git clone https://github.com/mjbvz/ts-issue-21582

1. For a js project:

jsconfig.json
src/
  index.js
  keeper.js
  animals/
      cat.js

With jsconfig.json:

{
	"compilerOptions": {
		"module": "commonjs",
		"target": "es2016",
		"baseUrl": ".",
		"paths": {
			"@zoo/*": ["./src/*"]
		}
	},
	"exclude": [
		"node_modules",
		"**/node_modules/*"
	]
}

2. In src/index.js, type: import {} from '@zoo/an'

3. Trigger path intellisense after @zoo/an

Expected behavior:
Returns a directory completion for animals

Actual behavior:
Only completions for index.js and keeper.js returned

Related
#21590

Should be fixed by #21633.