microsoft / microsoft/TypeScript

Better ownership lint to eliminate ownership chaos for generated code

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Beschreibung

### 🔍 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

Beitragsleitfaden

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Rechercherichtung

Beginnen Sie mit den Ownership-Beispielen in diesem Issue und vergleichen Sie die verlinkten Deno-Issues mit Issue 274 von TC39 proposal-explicit-resource-management. Die Anfrage nennt keine TypeScript-Dateien, Tests oder konkrete lint rule, und die Abschnitte zu ihren Defiziten und Workarounds sind noch TBD. Ein vollständiger Vorschlag müsste das Ownership-Modell, die Diagnosen und das erwartete Verhalten definieren, bevor mit der Implementierung begonnen werden kann.

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Bewertung

Tech-Stack
javascript, typescript
Bereich
compilers
Issue-Typ
Feature
Schwierigkeit
5/5
Geschätzter Aufwand
Über eine Woche
Aktivitätsstatus
Ruhig
Klarheit
Muss geklärt werden
Anfängerfreundlichkeit
18/100

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