typescript Element implicitly has an ‘any’ type because expression of type X can’t be used to index type Y

Any help to this would be appreciated

interface Error {
  messages: string[];
    entity: 'test' | null;

interface GroupedErrors {
  [errorGroup: string]: Error['messages'] | Error[];

interface UngroupedErrors {
  ungrouped: Error[];

type GroupErrors = GroupedErrors | UngroupedErrors | {};

interface Preset {
  errors: Error[];

export function groupPresetErrors(preset: Preset): GroupErrors {
  return preset.errors.reduce<GroupErrors>((acc, error) => {
    if (error.entity === 'test') {
      return {
        ['test']: acc['test']
          ? [...acc['test'], ...error.messages]
          : error.messages,
    return acc;
  }, {});

Element implicitly has an 'any' type because expression of type '"test"' can't be used to index type 'GroupErrors'. Property 'test' does not exist on type 'GroupErrors'.

Playground link

Read more here: https://stackoverflow.com/questions/68474014/typescript-element-implicitly-has-an-any-type-because-expression-of-type-x-can

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