lwc スクリプトでのバリデート情報取得

■入力時とかに何かしたい時
https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#the-constraint-validation-api

    handleChanges(event){
        console.log(event.target);
        console.log(event.target.name);
        console.log(event.target.value);
        if(event.target.name == 'test') {
            this.test = event.target.value;
            var elem = this.template.querySelector("lightning-input[data-item-id='test']");
            //エレメントからタグで定義したバリデーションの結果取得
            console.log(elem.validity.typeMismatch);
            console.log(elem.validity.valueMissing);
            console.log(elem.validity.tooLong);
            console.log(elem.validity.tooShort);
            console.log(elem.validity.stepMismatch);
            console.log(elem.validity.badInput);
        }
    }

■保存前とか一括の場合
https://www.salesforcepoint.com/2020/09/validate-lwc-input-data-how-to-add.html

    saveContact() {
        const isInputsCorrect = [...this.template.querySelectorAll('lightning-input')]
            .reduce((validSoFar, inputField) => {
                inputField.reportValidity();
                return validSoFar && inputField.checkValidity();
            }, true);
        if (isInputsCorrect) {
         //perform success logic

        }
    }