microsoft / microsoft/TypeScript

Better ownership lint to eliminate ownership chaos for generated code

Open
#63,540 6 comments 2 reactions 0 assignees View on GitHub
Needs Proposal Suggestion
Dominant language
Go
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Forks
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PR merge metrics
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Description

### 🔍 Search Terms

- proposal-explicit-resource-management
- ownership
- lifetime

### ✅ Viability Checklist

- [x] This wouldn't be a breaking change in existing TypeScript/JavaScript code
- [x] This wouldn't change the runtime behavior of existing JavaScript code
- [x] This could be implemented without emitting different JS based on the types of the expressions
- [x] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- [x] This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
- [x] This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

### ⭐ Suggestion

Better ownership lint to kill ownership chaos.

Maybe rust lifetime?

### 📃 Motivating Example

See

https://github.com/denoland/deno/issues/34953

Typescript should lint below code will crash due to ownership

```js
Deno.serve({}, async (_req) => {
using file = await Deno.open(new URL(import.meta.url).pathname);
return new Response(file.readable);
});
```

https://github.com/denoland/deno/issues/34953#issuecomment-4636526241

Some think

> `file.readable` carries ownership of the file

https://github.com/denoland/deno/issues/34953#issuecomment-4636588109

Some think `file.readable` does not carries ownership of the file

```js
> file.readable[Symbol.dispose]
undefined
```

### 💻 Use Cases

1. What do you want to use this for?

Better ownership type

2. What shortcomings exist with current approaches?

TBD

3. What workarounds are you using in the meantime?

No way.

## related

https://github.com/denoland/deno/issues/34931

Simple code leads to server crash due to ownership

Genered by AI.

Simplified for reproduce.

```ts
Deno.serve({}, async (_req) => {
using file = await Deno.open(new URL(import.meta.url).pathname);
return new Response(file.readable);
});
```

---

https://github.com/denoland/deno/issues/34953

How to easy stream file within deno server?

---

https://github.com/tc39/proposal-explicit-resource-management/issues/274

How does proposal-explicit-resource-management suggest how to easy extend stream file lifetime within server?

---

https://github.com/microsoft/TypeScript/issues/63540

Better ownership lint to kill ownership chaos

Contributor guide

Open the contributing guide

Research direction

Start with the ownership examples in this issue and compare the linked Deno issues with TC39 proposal-explicit-resource-management issue 274. The request does not identify TypeScript files, tests, or a concrete lint rule, and its shortcomings and workaround sections are still TBD. A complete proposal would need to define the ownership model, diagnostics, and expected behavior before implementation can begin.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, typescript
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
18/100

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