Function pick

packages/dev/parcel-packager-docs/DocsPackager.js:555–588

(obj, toPick, nodes)

// Exactly the same as `omit()` above except for `keys.has(key)` instead of `!keys.has(key)`.
function pick(obj, toPick, nodes) {
  obj = resolveValue(obj, nodes);

  if (obj.type === 'interface' || obj.type === 'object') {
    let keys = new Set();
    if (toPick.type === 'string' && toPick.value) {
      keys.add(toPick.value);
    } else if (toPick.type === 'union') {
      for (let e of toPick.elements) {
        if (e.type === 'string' && e.value) {
          keys.add(e.value);
        }
      }
    }

    if (keys.size === 0) {
      return obj;
    }

    let properties = {};
    for (let key in obj.properties) {
      if (keys.has(key)) {
        properties[key] = obj.properties[key];
      }
    }

    return {
      ...obj,
      properties
    };
  }

  return obj;
}

function resolveValue(obj, nodes) {
  if (obj.type === 'link') {