balena-cli/lib/utils/lazy.ts
Pagan Gazzard eac6bb5e5c Simplify lazy-loading of balena-sdk by utilizing a shared function
This also avoids instantiating multiple balena-sdk

Change-type: patch
2020-02-27 17:17:36 +00:00

33 lines
914 B
TypeScript

/*
Copyright 2020 Balena
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import * as BalenaSdk from 'balena-sdk';
// Equivalent of _.once but avoiding the need to import lodash for lazy deps
const once = <T>(fn: () => T) => {
let cached: T;
return (): T => {
if (!cached) {
cached = fn();
}
return cached;
};
};
export const getBalenaSdk = once(() =>
(require('balena-sdk') as typeof BalenaSdk).fromSharedOptions(),
);