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result-utils.ts

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result-utils.ts

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import { Result, failure, success } from './result';
import { ResultPromise } from './result-promise';
/**
* Converts the result of a promise into a result.
* If the promise is rejected, the rejected value is a failure `Result`.
* If the promise is resolved, the resolved value is a success `Result`.
*
* @example <caption>When the promise returns a value or throws:</caption>
*
* // Assuming `findUserById` returns a rejected promise if user is not found.
* const result = await fromPromise(findUserById(5));
*
* const user = result.getOrFail();
*/
export function fromPromise<S, F>(s: PromiseLike<S>): Promise<Result<S, F>> {
return Promise.resolve(s)
.then((h) => success<S, F>(h))
.catch((c) => failure<S, F>(c));
}
/**
* Runs a synchronous function, converting its result or thrown exception
* into a `Result`.
*
* @example <caption>When code throws an exception</caption>
*
* // Assuming user DOESN'T have the permissions to read the '/etc/passwd' file:
*
* const readingResult = runCatching(() => {
* return fs.readFileSync('/etc/passwd');
* });
*
* readingResult.isFailure(); // true
*
* const fileContent = readingResult.getOrFail(); // throws Error: EACCESS
*
* @example <caption>When code throws an exception</caption>
*
* // Assuming user DOES have the permissions to read the '/etc/passwd' file:
*
* const readingResult = runCatching(() => {
* return fs.readFileSync('/etc/passwd');
* });
*
* readingResult.isSuccess(); // true
*
* const fileContent = readingResult.getOrFail(); // returns file content
*
* @example <caption>Using just for the collateral effect</caption>
*
* const result = runCatching(() => {
* jwt.verify(token, 'wrong-secret'); // returning nothing here.
* });
*
* result.isSuccess() // false
*/
export function runCatching<S, F = Error>(run: () => S): Result<S, F> {
try {
return success<S, F>(run());
} catch (err) {
return failure<S, F>(err);
}
}
/**
* The async version of `runCatching`.
*
* @see runCatching
* @see fromPromise
* @example
*
* // Assuming `makeRemoteRequest` returns a rejected promise:
*
* const responseResult = await runCatchingAsync(() => {
* return makeRemoteRequest(); // returns a `Promise`
* });
*
* responseResult.isFailure(); // true
*
* const httpResponse = responseResult.getOrFail(); // throws an error because promise was rejected.
*
*/
export function runCatchingAsync<S, F = Error>(
run: () => PromiseLike<S>,
): ResultPromise<S, F> {
return new ResultPromise(fromPromise(Promise.resolve(run).then((r) => r())));
}
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