How to use the feathers-hooks-common.validateSchema function in feathers-hooks-common

let validateUpdate = options => {
  // ! code: func_update
  return validateSchema(update, ajv, options);
  // !end
};

}
});
// $ExpectType Hook>
traverse(function(node) {
    if (typeof node === 'string') {
        this.update(node.trim());
    }
}, context => context.params.query);

// $ExpectType Hook>
validate(async (data, context) => {
    return { length: 'expected max 3, got 7' };
});

// $ExpectType Hook>
validateSchema({}, ajv);

// $ExpectType Hook>
iffElse(syncTrue, [hook1, hook2], [hook3, hook4]);
// $ExpectType Hook>
iffElse(asyncTrue, [hook1, hook2], [hook3, hook4]);

// $ExpectType IffHook
iff(syncTrue, hook1, hook2);
// $ExpectType IffHook
iff(asyncTrue, hook1, hook2);
// $ExpectType Hook>
iff(syncTrue, hook1, hook2).else(hook3, hook4);
// $ExpectType Hook>
iff(asyncTrue, hook1, hook2).else(hook3, hook4);

// $ExpectType IffHook

let validatePatch = (options?: any) => {
  // ! code: func_patch
  return validateSchema(patch, ajv, options);
  // !end
};

let validateUpdate = (options?: any) => {
  // ! code: func_update
  return validateSchema(update, ajv, options);
  // !end
};

let validateUpdate = (options?: any) => {
  // ! code: func_update
  return validateSchema(update, ajv, options);
  // !end
};

let validateCreate = (options?: any) => {
  // ! code: func_create
  return validateSchema(create, ajv, options);
  // !end
};

let validateCreate = options => {
  // ! code: func_create
  return validateSchema(create, ajv, options);
  // !end
};

let validatePatch = (options?: any) => {
  // ! code: func_patch
  return validateSchema(patch, ajv, options);
  // !end
};

let validateCreate = (options?: any) => {
  // ! code: func_create
  return validateSchema(create, ajv, options);
  // !end
};

let validateCreate = (options?: any) => {
  // ! code: func_create
  return validateSchema(create, ajv, options);
  // !end
};