@wordpress/format-library/build-module/link/use-link-instance-key.js

Format library for the WordPress editor.

// Weakly referenced map allows unused ids to be garbage collected.
const weakMap = new WeakMap();

// Incrementing zero-based ID value.
let id = -1;
const prefix = 'link-control-instance';
function getKey(_id) {
  return `${prefix}-${_id}`;
}

/**
 * Builds a unique link control key for the given object reference.
 *
 * @param {Object} instance an unique object reference specific to this link control instance.
 * @return {string | undefined} the unique key to use for this link control.
 */
function useLinkInstanceKey(instance) {
  if (!instance) {
    return;
  }
  if (weakMap.has(instance)) {
    return getKey(weakMap.get(instance));
  }
  id += 1;
  weakMap.set(instance, id);
  return getKey(id);
}
export default useLinkInstanceKey;
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