gleam-lang/gleam

Re-export types and values from other modules

Open

#614 创建于 2020年5月28日

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 (27 评论) (13 反应) (0 负责人)Rust (21,417 star) (960 fork)batch import
discussionhelp wanted

描述

It would be nice to be able to re-export a type or function from another module.

Here's an idea for a syntax:

// one.gleam
pub type MyType {
  MyConstructor
}

pub fn my_function() -> Nil {
  Nil
}

// two.gleam

import two.{pub MyType, pub MyConstructor, pub my_function}

Questions

Should it be permitted to export only a subset of a type's constructors? This would mean it would not possible for users to pattern match on all records as only some have been exported. The above syntax would allow that.

贡献者指南

技术栈
rust
领域
developer experience
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
4
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Knowledge of RustUnderstanding of Gleam's module systemFamiliarity with compiler internals
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
25
研究方向
Study the current import/export infrastructure in the Gleam compiler, likely in the `src/` directory, focusing on how modules are resolved and how symbols are exposed. Explore existing GitHub issue comments for design considerations, particularly regarding whether to allow exporting only a subset of a type's constructors. A proposed syntax is given in the issue; implementing it would involve parsing new syntax and modifying the compiler's name resolution and type checking phases.