Validation library for TypeScript/JavaScript supporting sync and async validation with state
Work-in-progress
Polyfills required for ES5 compatibility:
- for..of
- Promise
- Object.assign
- Object.spread
Initially ts-validate started out as a port of shelakel/elm-validate. This library aims to be easy to use.
Validation produces validation state "diffs" that is compatible with most immutable implementations and redux time-travelling (JSON serialization of state).
See examples.
const validateUsername = createValidator<string>(
"username",
[value => value ? null : "Username is required"],
[]
);
const validatePassword = createValidator<string>(
"password",
[value => value ? null : "Password is required"],
[]
);
const validateModel: ((model: any) => ValidateResult) =
model => combineValidateResults(
validateUsername(model.username),
validatePassword(model.password)
);
export function setUsername(username: string) {
return dispatchWithValidationState(actions.SET_USERNAME, { username }, validateUsername(username));
}
export function setPassword(password: string) {
return dispatchWithValidationState(actions.SET_PASSWORD, { password }, validatePassword(password));
}
// redux-thunk
function dispatchWithValidationState(
action: string,
merge: {},
{validationState, futureValidationState }: ValidateResult):
((dispatch: ((action: Action<HasValidationState>) => void)) => void) {
return function (dispatch: ((action: Action<HasValidationState>) => void)) {
dispatch({ type: action, payload: Object.assign(merge, { validationState }) });
if (futureValidationState) {
futureValidationState.then((validationState: ValidationState) =>
dispatch({ type: actions.UPDATE_VALIDATION_STATE, payload: { validationState } }));
}
};
}MIT