withUnitTester.js

import {
  rankWith,
  scopeEndsWith
} from '@jsonforms/core';

export default rankWith(
  Number.MAX_VALUE,
  (x) => {
    if(!x.elements) {
      return false
    }

    const lastElement = x.elements[x.elements.length - 1]

    return lastElement.scope && lastElement.scope.endsWith("unit")
  }
);