Default sourceDirectory forces imports from index

[anand-sundaram-zocdoc]

lerna-alias/lib/index.js

Line 35 in e865ecb

entry = `${sourceDirectory}/index`

causes it to be the case that if I want to import from myPackage/src/notIndexFile.js this is impossible; I must export everything from the index and import directly from there. if we did not include index in the string, I believe everything would still work that wants to import from index by default, but it would also be possible to import from other files and folders in the directory.