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tiny-invariant.d.ts
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/** * `invariant` is used to [assert](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#assertion-functions) that the `condition` is [truthy](https://github.com/getify/You-Dont-Know-JS/blob/bdbe570600d4e1107d0b131787903ca1c9ec8140/up%20%26%20going/ch2.md#truthy--falsy). * * 💥 `invariant` will `throw` an `Error` if the `condition` is [falsey](https://github.com/getify/You-Dont-Know-JS/blob/bdbe570600d4e1107d0b131787903ca1c9ec8140/up%20%26%20going/ch2.md#truthy--falsy) * * 🤏 `message`s are not displayed in production environments to help keep bundles small * * @example * * ```ts * const value: Person | null = { name: 'Alex' }; * invariant(value, 'Expected value to be a person'); * // type of `value`` has been narrowed to `Person` * ``` */ export default function invariant(condition: any, /** * Can provide a string, or a function that returns a string for cases where * the message takes a fair amount of effort to compute */ message?: string | (() => string)): asserts condition;