Only accept strings for the totalLabel filter

assets/js/base/components/cart-checkout/totals/footer-item/index.js

@@ -11,7 +11,6 @@ import FormattedMonetaryAmount from '@woocommerce/base-components/formatted-mone
 import PropTypes from 'prop-types';
 import {
 	__experimentalApplyCheckoutFilter,
-	__experimentalValidateElementOrString,
 	TotalsItem,
 } from '@woocommerce/blocks-checkout';
 import { useStoreCart } from '@woocommerce/base-hooks';
@@ -32,7 +31,8 @@ const TotalsFooterItem = ( { currency, values } ) => {
 		args: {
 			extensions,
 		},
-		validate: __experimentalValidateElementOrString,
+		// Only accept strings.
+		validate: ( value ) => typeof value === 'string',
 	} );
 
 	return (

docs/blocks/feature-flags-and-experimental-interfaces.md

@@ -58,5 +58,4 @@ We also have individual features or code blocks behind a feature flag, this is a
 -   `__experimentalDeRegisterPaymentMethod` function used to deregister a payment method, only used in tests ([experimental function](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b07883b8b76feeb439d655b255507b24fc59e091/assets/js/blocks-registry/payment-methods/registry.js#L70)).
 -   `__experimentalDeRegisterExpressPaymentMethod` function used to deregister an express payment method, only used in tests ([experimental function](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/b07883b8b76feeb439d655b255507b24fc59e091/assets/js/blocks-registry/payment-methods/registry.js#L74)).
 -   `__experimentalRegisterCheckoutFilters` and `__experimentalApplyCheckoutFilter` methods included with `@woocommerce/blocks-checkout` package. They allow registering and applying a filter to certain parts of the Cart and Checkout blocks ([experimental method 1](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/3e59ec9842464f783f6e087947e717fa0b0a7b1b/packages/checkout/registry/index.js#L2) | [experimental method 2](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/3e59ec9842464f783f6e087947e717fa0b0a7b1b/packages/checkout/registry/index.js#L17)).
--   `__experimentalValidateElementOrString` method included with `@woocommerce/blocks-checkout` package. Allows validating that a value is a valid element or a string ([experimental method](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/277ad369504c38abcc68a4cdbb034c421fe4d123/packages/checkout/registry/validations.js#L6)).
 -   `__experimental_woocommerce_blocks_hidden` property in a Cart item data array that allows overwriting the `hidden` property. This is useful to make some cart item data visible/hidden depending if it needs to be displayed in Blocks or shortcode ([experimental property](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/9c4288b0ee46960bdc2bf8ef351d05ac23073b0c/src/StoreApi/Schemas/CartItemSchema.php#L439-L441)).

packages/checkout/index.js

@@ -2,7 +2,6 @@ export * from './totals';
 export * from './shipping';
 export * from './slot';
 export * from './registry';
-export * from './registry/validations.js';
 export { default as ExperimentalOrderMeta } from './order-meta';
 export { default as ExperimentalOrderShippingPackages } from './order-shipping-packages';
 export { default as Panel } from './panel';

packages/checkout/registry/test/index.js

@@ -5,7 +5,6 @@ import {
 	__experimentalRegisterCheckoutFilters,
 	__experimentalApplyCheckoutFilter,
 } from '../';
-import { __experimentalValidateElementOrString } from '../validations';
 
 describe( 'Checkout registry', () => {
 	const filterName = 'loremIpsum';
@@ -50,32 +49,4 @@ describe( 'Checkout registry', () => {
 
 		expect( newValue ).toBe( value );
 	} );
-
-	describe( 'validations', () => {
-		test( '__experimentalValidateElementOrString should invalidate if filtered value is not an element or string', () => {
-			__experimentalRegisterCheckoutFilters( filterName, {
-				[ filterName ]: ( val ) => {
-					if ( val === 'Hello World' ) {
-						return 'Valid value';
-					}
-					return [ 'invalid-value' ];
-				},
-			} );
-			const validValue = __experimentalApplyCheckoutFilter( {
-				filterName,
-				defaultValue: 'Hello World',
-				validate: __experimentalValidateElementOrString,
-			} );
-
-			expect( validValue ).toBe( 'Valid value' );
-
-			const invalidValue = __experimentalApplyCheckoutFilter( {
-				filterName,
-				defaultValue: 'Hello Earth',
-				validate: __experimentalValidateElementOrString,
-			} );
-
-			expect( invalidValue ).toBe( 'Hello Earth' );
-		} );
-	} );
 } );