core-js/modules/esnext.reflect.delete-metadata.js

var $ = require('../internals/export');
var ReflectMetadataModule = require('../internals/reflect-metadata');
var anObject = require('../internals/an-object');

var toMetadataKey = ReflectMetadataModule.toKey;
var getOrCreateMetadataMap = ReflectMetadataModule.getMap;
var store = ReflectMetadataModule.store;

// `Reflect.deleteMetadata` method
// https://github.com/rbuckton/reflect-metadata
$({ target: 'Reflect', stat: true }, {
  deleteMetadata: function deleteMetadata(metadataKey, target /* , targetKey */) {
    var targetKey = arguments.length < 3 ? undefined : toMetadataKey(arguments[2]);
    var metadataMap = getOrCreateMetadataMap(anObject(target), targetKey, false);
    if (metadataMap === undefined || !metadataMap['delete'](metadataKey)) return false;
    if (metadataMap.size) return true;
    var targetMetadata = store.get(target);
    targetMetadata['delete'](targetKey);
    return !!targetMetadata.size || store['delete'](target);
  }
});