An invariant function, which takes a condition
and a optional message
value,
and throw an error when the given condition fails.
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npm
npm install --save @guanghechen/invariant
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yarn
yarn add @guanghechen/invariant
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Syntax
function invariant( condition: boolean, message?: string | (() => string), ): asserts condition
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Demo
import invariant from '@guanghechen/invariant' invariant(typeof window !== 'undefined', '`window` is not defined.') invariant(typeof window !== 'undefined', () => '`window` is not defined:' + window)