-
-
Notifications
You must be signed in to change notification settings - Fork 6
/
Evt.getCtx.ts
34 lines (22 loc) · 834 Bytes
/
Evt.getCtx.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
import { Polyfill as WeakMap } from "https://raw.githubusercontent.com/garronej/minimal_polyfills/v2.2.1/deno_dist/WeakMap.ts";
import { importProxy } from "./importProxy.ts";
import type { Ctx } from "./types/index.ts";
/**
* https://docs.evt.land/api/evt/getctx
*
* Evt.getCtx(obj) an instance of Ctx<void>, always the same for a given object.
* No strong reference to the object is created
* when the object is no longer referenced it's associated Ctx will be freed from memory.
*/
export function getCtxFactory() {
const ctxByObj = new WeakMap<object, Ctx>();
function getCtx(obj: object): Ctx {
let ctx = ctxByObj.get(obj);
if (ctx === undefined) {
ctx = (new importProxy.Ctx());
ctxByObj.set(obj, ctx);
}
return ctx;
}
return getCtx;
}