Resolving Async Validation

Because validate returns synchronously, your application must recognize when async validation needs to be resolved. The validation result returned from validate will only include the validateAsync property when a async validation needs to be resolved. If the validateAsync result property exists, it will be a function that returns a Promise.
const result = validate(usernameIsAvailable, 'marty');
​
// The application defines a `handleValidationResult` function
// to handle validation results when the are completed
​
if (result.validateAsync) {
    result.validateAsync().then((asyncResult) => handleValidationResult(asyncResult));
} else {
    handleValidationResult(result);
}
Async Validation Helper: validateAsync
To avoid boilerplate code, Strickland provides a validateAsync function as a named export. This function always returns a Promise, regardless of whether validation completed synchronously or needs to be resolved asynchronously.
import {validateAsync} from 'strickland';
​
const result = validateAsync(usernameIsAvailable, 'marty');
result.then((asyncResult) => handleValidationResult(asyncResult));
Async Validation
Deferred Async Validation
Last modified 2yr ago