react-native/Libraries/Blob/BlobRegistry.js

39 lines
666 B
JavaScript

/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict
* @format
*/
const registry: {[key: string]: number} = {};
const register = (id: string) => {
if (registry[id]) {
registry[id]++;
} else {
registry[id] = 1;
}
};
const unregister = (id: string) => {
if (registry[id]) {
registry[id]--;
if (registry[id] <= 0) {
delete registry[id];
}
}
};
const has = (id: string) => {
return registry[id] && registry[id] > 0;
};
module.exports = {
register,
unregister,
has,
};