Resolves:#2318 (comment)

Forbid import from parent barrel file which often leads to runtime errorcannot read ... of undefined.

Gien:

• foo/
  • index.ts
  • bar/
    • index.ts
    • baz.ts
    • qux.ts
  • quux/
    • index.ts
    • ...

// foo/bar/baz.tsimport{T}from'../..';// forbiddenimport{T}from'..';// forbiddenimport{T}from'.';// forbiddenimport{T}from'foo';// forbiddenimport{T}from'foo/bar';// forbiddenimport{T}from'./qux';// permittedimport{T}from'foo/bar/qux';// permittedimport{U}from'../quux';// permittedimport{U}from'foo/quux';// permitted

It resolves the missing cycle check fromno-self-import, while being computationally cheap (overno-cycle)

Rationale

Though it seems that the issue should have been covered by existing rules, there actually isn't one that prevents this circular import / runtime error via parent barrel file (index.js) efficiently.

• no-self-import: doesn't check indirect import
• no-cycle: very costly on large codebase
• no-restricted-paths: requires fixed patterns and not available as a general rule for every folder

Related Issue

There is a related rule of a larger scope:#2408 but further adjustment might be needed. Also it seems to be overly restrictive on importing from non-parent folder (forbidsimport example2 from '../dir2'; fromdir1/file.js) which might need more justification.