How to use the core-js/library/fn/array/fill function in core-js

(defaults || {})[idx],
            definitions,
            item
          );
        });
      }
      if (schema.minItems) {
        if (!isMultiSelect(schema, definitions)) {
          const defaultsLength = defaults ? defaults.length : 0;
          if (schema.minItems > defaultsLength) {
            const defaultEntries = defaults || [];
            // populate the array with the defaults
            const fillerSchema = Array.isArray(schema.items)
              ? schema.additionalItems
              : schema.items;
            const fillerEntries = fill(
              new Array(schema.minItems - defaultsLength),
              computeDefaults(fillerSchema, fillerSchema.defaults, definitions)
            );
            // then fill up the rest with either the item default or empty, up to minItems

            return defaultEntries.concat(fillerEntries);
          }
        } else {
          return defaults ? defaults : [];
        }
      }
  }
  return defaults;
}

(formData || {})[key]
        )
        return acc
      }, {})

    case 'array':
      if (schema.minItems) {
        if (!isMultiSelect(schema, definitions)) {
          const defaultsLength = defaults ? defaults.length : 0
          if (schema.minItems > defaultsLength) {
            const defaultEntries = defaults || []
            // populate the array with the defaults
            const fillerSchema = Array.isArray(schema.items)
              ? schema.additionalItems
              : schema.items
            const fillerEntries = fill(
              new Array(schema.minItems - defaultsLength),
              computeDefaults(fillerSchema, fillerSchema.defaults, definitions)
            )
            // then fill up the rest with either the item default or empty, up to minItems

            return defaultEntries.concat(fillerEntries)
          }
        } else {
          return defaults ? defaults : []
        }
      }
  }
  return defaults
}

definitions
        );
        return acc;
      }, {});

    case "array":
      if (schema.minItems) {
        if (!isMultiSelect(schema, definitions)) {
          const defaultsLength = defaults ? defaults.length : 0;
          if (schema.minItems > defaultsLength) {
            const defaultEntries = defaults || [];
            // populate the array with the defaults
            const fillerSchema = Array.isArray(schema.items)
              ? schema.additionalItems
              : schema.items;
            const fillerEntries = fill(
              new Array(schema.minItems - defaultsLength),
              computeDefaults(fillerSchema, fillerSchema.defaults, definitions)
            );
            // then fill up the rest with either the item default or empty, up to minItems

            return defaultEntries.concat(fillerEntries);
          }
        } else {
          return [];
        }
      }
  }
  return defaults;
}