@ledgerhq/live-common
Version:
Common ground for the Ledger Live apps
31 lines • 858 B
JavaScript
import { map } from "rxjs/operators";
// from https://github.com/NiklasPor/rxjs-boost (MIT)
/**
* Throws the error built by `errorFn` if `conditionFn` evaluates to be truthy.
*
* @param conditionFn Determines if an error should be thrown.
* @param errorFn Evaluates to the error which can be thrown.
*
* @example
* ```
* const input = cold(' ft', { f: false, t: true });
* const expected = cold('f#', { f: false }, 'error');
*
* const result = input.pipe(
* // will throw 'error' for values === true
* throwIf(
* (val) => val
* () => error
* )
* );
* ```
*/
export function throwIf(conditionFn, errorFn) {
return (input) => input.pipe(map((value, index) => {
if (conditionFn(value, index)) {
throw errorFn(value, index);
}
return value;
}));
}
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