@sunnysideup/npm-page-favourites-bookmarker/src/core/utils.js

NPM package - to bookmark / favourite any page on a website

export const qs = (root, sel) =>
  /** @type {HTMLElement} */ (root.querySelector(sel))
export const qsa = (root, sel) => Array.from(root.querySelectorAll(sel))

// utils/merge.js
const isObj = x => x && typeof x === 'object' && !Array.isArray(x)
export function deepMerge (...sources) {
  const out = {}
  for (const src of sources) {
    if (!isObj(src)) continue
    for (const k of Object.keys(src)) {
      const v = src[k]
      out[k] = isObj(v) && isObj(out[k]) ? deepMerge(out[k], v) : v
    }
  }
  return out
}