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Feature request: Qualified subdirectories (directory-based module namespaces)

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基本清楚
活躍度
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技術堆疊
ocaml
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compilers

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Read the existing recursive source scanning behavior described in the issue and the related proposals #1974, #1805, and #2459. The issue does not name implementation files or tests; first locate where subdirs: true is handled in the compiler and review its module naming rules. Done means an opt-in qualified mode supports the shown directory hierarchy and duplicate filenames while preserving the default behavior.

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描述

Feature request: Qualified subdirectories (directory-based module namespaces)

Hi! I've been using ReScript a bit in my free time recently, and have been really enjoying it. However I've found it quite difficult/frustrating to organize code/packages using ReScript's existing tooling (even when using the "monorepo" features).

I'd like to propose an opt-in feature similar to Dune's (include_subdirs qualified), where source directories automatically become part of the ReScript module hierarchy.

For example, given:

src/
  App.res
  Components/
    Button.res
    Input.res
  Admin/
    Button.res

App.res could reference Components.Button, Components.Input, and Admin.Button.

This would provide two benefits:

  • Better code organization: Module hierarchies could mirror the filesystem without manually creating wrapper modules.
  • Duplicate filenames: Files such as Components/Button.res and Admin/Button.res could coexist without module-name collisions.

Currently, recursive source scanning (subdirs: true) places all files in a flat module namespace.

Ideally, this would be an opt-in configuration (perhaps subdirs: "qualified"), preserving existing behavior by default. Directory modules could be implemented using compile-time aliases, without introducing additional JavaScript runtime wrappers.

Related issues
References

Thanks!
Ethan

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OCaml
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