refactor(inputs): apiCheck only type and step

At the moment it is impossible to check if min, max or step are being
used only when type === 'number'.

Author: Kamil Kisiela

src/types/input/input.js

@@ -2,10 +2,6 @@ import template from './input.html';
 import { ngModelAttrsTransformer } from './../../helpers';
 
 export default (formlyConfigProvider) => {
-  function onlyNumberType(check) {
-    return check.shape.onlyIf(['type'], check.oneOf(['number'])).optional;
-  }
-
   formlyConfigProvider.setType({
     template,
     name: 'input',
@@ -23,9 +19,8 @@ export default (formlyConfigProvider) => {
     apiCheck: (check) => {
       return {
         templateOptions: {
-          step: onlyNumberType(check),
-          min: onlyNumberType(check),
-          max: onlyNumberType(check)
+          type: check.string,
+          step: check.number.optional
         }
       };
     }

tests/types/input-spec.js

@@ -78,18 +78,6 @@ describe('formlyMaterial - input type', () => {
 
   describe('number type specific', () => {
     describe('step attribute', () => {
-      it('should fail on non number type', () => {
-        expect(() => {
-          compile({
-            templateOptions: {
-              type: 'text',
-              step: 2
-            },
-            apiCheckFunction: 'throw'
-          });
-        }).toThrowError(Error, /step/i);
-      });
-
       it('should not be available on non number type', () => {
         compile({
           templateOptions: {
@@ -114,18 +102,6 @@ describe('formlyMaterial - input type', () => {
     });
 
     describe('min attribute', () => {
-      it('should fail on non number type', () => {
-        expect(() => {
-          compile({
-            templateOptions: {
-              type: 'text',
-              min: 2
-            },
-            apiCheckFunction: 'throw'
-          });
-        }).toThrowError(Error, /min/i);
-      });
-
       it('should be available on number type', () => {
         compile({
           templateOptions: {
@@ -139,18 +115,6 @@ describe('formlyMaterial - input type', () => {
     });
 
     describe('max attribute', () => {
-      it('should fail on non number type', () => {
-        expect(() => {
-          compile({
-            templateOptions: {
-              type: 'text',
-              max: 2
-            },
-            apiCheckFunction: 'throw'
-          });
-        }).toThrowError(Error, /max/i);
-      });
-
       it('should be available on number type', () => {
         compile({
           templateOptions: {