mirror of
https://github.com/balena-io/balena-cli.git
synced 2024-12-28 09:38:51 +00:00
667358b23e
This saves ~100ms for me on startup with no fast-boot cache and ~50ms with a fast-boot cache Change-type: patch
58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
/*
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Copyright 2020 Balena
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// tslint:disable:import-blacklist - the import blacklist is to enforce lazy loading so exempt this file
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import type * as BalenaSdk from 'balena-sdk';
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import type { Chalk } from 'chalk';
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import type * as visuals from 'resin-cli-visuals';
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import type { stripIndent as StripIndent } from 'common-tags';
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// Equivalent of _.once but avoiding the need to import lodash for lazy deps
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const once = <T>(fn: () => T) => {
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let cached: T;
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return (): T => {
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if (!cached) {
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cached = fn();
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}
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return cached;
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};
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};
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export const onceAsync = <T>(fn: () => Promise<T>) => {
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let cached: T;
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return async (): Promise<T> => {
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if (!cached) {
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cached = await fn();
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}
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return cached;
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};
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};
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export const getBalenaSdk = once(() =>
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(require('balena-sdk') as typeof BalenaSdk).fromSharedOptions(),
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);
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export const getVisuals = once(
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() => require('resin-cli-visuals') as typeof visuals,
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);
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export const getChalk = once(() => require('chalk') as Chalk);
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// Directly export stripIndent as we always use it immediately, but importing just `stripIndent` reduces startup time
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// tslint:disable-next-line:no-var-requires
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export const stripIndent = require('common-tags/lib/stripIndent') as typeof StripIndent;
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