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x/evt/lib/Evt.getCtx.ts

šŸ’§EventEmitter's typesafe replacement
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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;
}