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This allows patterns such as this when strict null checks are on:
let instance: Thing | undefined;
function getInstance(): Thing {
return instance || invariant(false, "`instance` not instantiated");
}
25 lines
736 B
TypeScript
25 lines
736 B
TypeScript
import invariant = require("invariant");
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// will throw in dev mode (process.env.NODE_ENV !== 'production')
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invariant(true);
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// will pass in production (process.env.NODE_ENV === 'production')
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invariant(true);
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// will pass in dev mode and production mode
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invariant(true, 'Error, error, read all about it');
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// will throw in dev mode, and production mode
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invariant(false, 'Some other error');
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// will throw in dev mode, and production mode
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invariant(0, 'Some other error');
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// will throw in dev mode, and production mode
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invariant('', 'Some other error');
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// handles extra variables
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invariant(true, 'Error, error, read all about it', 37, {}, 'hello');
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// $ExpectType {}
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({} as {} | undefined) || invariant(false, 'a is undefined'); |