initial version of code

src/AsyncContexter.js

@@ -0,0 +1,25 @@
+import { createHook, executionAsyncId } from 'async_hooks'
+
+let asyncContexters = new Set()
+
+createHook({
+	init(asyncId, type, triggerAsyncId) {
+		asyncContexters.forEach(asyncContexter => asyncContexter._contexts.set(asyncId, asyncContexter._contexts.get(triggerAsyncId)))
+	},
+	destroy(asyncId) {
+		asyncContexters.forEach(asyncContexter => asyncContexter._contexts.delete(asyncId))
+	},
+}).enable()
+
+export default class AsyncContexter {
+	constructor() {
+		this._contexts = new Map()
+		asyncContexters.add(this)
+	}
+	new() {
+		this._contexts.set(executionAsyncId(), Object.create(this._contexts.get(executionAsyncId()) || null))
+	}
+	get context() {
+		return this._contexts.get(executionAsyncId())
+	}
+}