react-native/Libraries/Blob/BlobRegistry.js
Eli White eea4842972 Flow strictify possible files in RN core
Summary:
This was done by running the command on: https://our.intern.facebook.com/intern/wiki/Flow_Strict/

```
ag -L --ignore __snapshots__ 'flow strict$|noflow|generated|partially-generated' | ag '\.js$' | xargs ag -l 'flow' | sort > ~/temp
cat ~/temp | xargs ag -L 'flow strict' | xargs sed -i 's/flow$/flow strict/'
cat ~/temp | xargs ag -L 'flow strict$' | xargs sed -i 's/flow strict-local$/flow strict/'
until flow; do flow --json | jq -r '.errors[].message[0].path' | sort | uniq | xargs hg revert; done
```

Reviewed By: sahrens

Differential Revision: D8530207

fbshipit-source-id: c28c7ac5ed3e9b80f3d126d5f30463be8a8a744d
2018-06-20 00:47:21 -07:00

39 lines
660 B
JavaScript

/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* 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,
};