@fest-lib/core
Level 0.5 — no fest peers. Everything else in the stack unwraps values through this package.

getValue on refs, type / empty guards, deferred promises, channels, mapped collections, user-scope paths, time / phone helpers, launcher grid math, WeakRef wrappers, and DOM constructor polyfills so the same code runs in window, worker, and Node.

fest/core          ← you are here
 └── dom · object · veela · uniform · lure · icon · image · fl-ui

Install

npm install @fest-lib/core

ESM only. Node 20+. No peer dependencies.

import { getValue, isObject, createDeferred, debounce } from "@fest-lib/core";

const raw = getValue(maybeRef);          // ref.value or the value itself
const { promise, resolve } = createDeferred<string>();
const onResize = debounce(() => measure(), 48);

What you get

Area	Typical exports	Source
Refs & types	getValue, isObject	src/utils/Primitive.ts
Promises	createDeferred, queues, timeouts	src/utils/PromiseUtils.ts
Debounce	debounce	src/utils/Misc.ts
Collections	mapped helpers	src/utils/Mapped.ts
Paths	user-scope normalize	src/utils/UserPath.ts
Launcher grid	cell / layout math	src/utils/GridItemUtils.ts
Time / phone	format helpers	src/utils/Time.ts, Phone.ts
Host polyfills	EventTarget / DOM ctors in workers	src/runtime/dom-globals-polyfill.ts

Importing the package installs the polyfills once. That is intentional.

Workspace

cd modules/projects/core.ts
npm run dev          # Vite playground
npm run build        # dist + typedoc
npm run publish      # patch +1, then npm publish

Generated API: npm run docs:md → ./docs-md. License: MIT.