| 1 | // @flow
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| 2 | // This file is not actually executed
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| 3 | // It is just used by flow for typing
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| 4 |
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| 5 | const prefix: string = 'Invariant failed';
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| 6 |
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| 7 | export default function invariant(condition: mixed, message?: string) {
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| 8 | if (condition) {
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| 9 | return;
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| 10 | }
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| 11 | throw new Error(`${prefix}: ${message || ''}`);
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| 12 | }
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