36 lines
907 B
TypeScript
36 lines
907 B
TypeScript
declare namespace ensureError {
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interface NonError extends Error {
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name: 'NonError';
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}
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}
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// IfAny<T, ThenType, ElseType> resolves to ThenType if T is `any` and resolves to ElseType otherwise
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// https://stackoverflow.com/a/49928360/4135063
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type IfAny<T, ThenType, ElseType> = 0 extends (1 & T) ? ThenType : ElseType;
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/**
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Ensures a value is a valid error by making it one if not.
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If `input` is an `Error`, any missing `Error` properties will be added.
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If it's not an `Error`, `input` is converted to an `Error`.
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@example
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```
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import ensureError = require('ensure-error');
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const error = new TypeError('🦄');
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error.name = '';
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console.log(error.name);
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//=> ''
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console.log(ensureError(error).name);
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//=> 'TypeError'
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console.log(ensureError(10));
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//=> [NonError: 10]
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```
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*/
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declare function ensureError<T>(input: T): IfAny<T, Error, T extends Error ? T : ensureError.NonError>;
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export = ensureError;
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