How to use the jsonforms-core.schemaSubPathMatches function in jsonforms-core

export const getStyle = (styleName: string) =>
  JsonForms.stylingRegistry.getAsClassName(styleName);

/**
 * Default tester for an array control.
 * @type {RankedTester}
 */
export const arrayTester: RankedTester = rankWith(2, and(
  uiTypeIs('Control'),
  schemaMatches(schema =>
    !_.isEmpty(schema)
    && schema.type === 'array'
    && !_.isEmpty(schema.items)
    && !Array.isArray(schema.items) // we don't care about tuples
  ),
  schemaSubPathMatches('items', schema =>
    schema.type === 'object'
  ))
);

const addNewItem = (dispatch, path: string) => {
  const element = {};
  dispatch(
    update(
      path,
      array => {
        if (array === undefined || array === null) {
          return [element];
        }

        const clone = _.clone(array);
        clone.push(element);