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refactor(forms): use a type guard to get rid of casts (#32541) 

Use an explicit type guard when checking if a given object is of type AbstractControlOptions,
instead of a simple function returning a boolean value. This allows us to remove manual type
casting when using this function, relying instead on TypeScript to infer correct types.

PR Close #32541
This commit is contained in:
lazarljubenovic 2019-09-07 20:13:19 +02:00 committed by atscott
parent 382aa50c54
commit 06a8ad28a7
1 changed files with 5 additions and 12 deletions
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17
packages/forms/src/model.ts
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@ -71,11 +71,7 @@ function _find(control: AbstractControl, path: Array<string|number>|string, deli
function coerceToValidator(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|
null): ValidatorFn|null {
const validator =
(isOptionsObj(validatorOrOpts) ? (validatorOrOpts as AbstractControlOptions).validators :
validatorOrOpts) as ValidatorFn |
ValidatorFn[] | null;
const validator = isOptionsObj(validatorOrOpts) ? validatorOrOpts.validators : validatorOrOpts;
return Array.isArray(validator) ? composeValidators(validator) : validator || null;
}
@ -84,10 +80,7 @@ function coerceToAsyncValidator(
validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): AsyncValidatorFn|
null {
const origAsyncValidator =
(isOptionsObj(validatorOrOpts) ? (validatorOrOpts as AbstractControlOptions).asyncValidators :
asyncValidator) as AsyncValidatorFn |
AsyncValidatorFn | null;
isOptionsObj(validatorOrOpts) ? validatorOrOpts.asyncValidators : asyncValidator;
return Array.isArray(origAsyncValidator) ? composeAsyncValidators(origAsyncValidator) :
origAsyncValidator || null;
}
@ -119,7 +112,7 @@ export interface AbstractControlOptions {
function isOptionsObj(validatorOrOpts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|
null): boolean {
null): validatorOrOpts is AbstractControlOptions {
return validatorOrOpts != null && !Array.isArray(validatorOrOpts) &&
typeof validatorOrOpts === 'object';
}
@ -914,8 +907,8 @@ export abstract class AbstractControl {
/** @internal */
_setUpdateStrategy(opts?: ValidatorFn|ValidatorFn[]|AbstractControlOptions|null): void {
if (isOptionsObj(opts) && (opts as AbstractControlOptions).updateOn != null) {
this._updateOn = (opts as AbstractControlOptions).updateOn!;
if (isOptionsObj(opts) && opts.updateOn != null) {
this._updateOn = opts.updateOn!;
}
}