Nest js pipe to transform query string boolean into boolean using open api metadata

TransformBooleanPipe.ts

import { PipeTransform, Injectable, ArgumentMetadata } from "@nestjs/common";

type TrueArgumentMetadata = ArgumentMetadata & {
  metatype: { _OPENAPI_METADATA_FACTORY: () => Record<string, any> };
};

@Injectable()
export class TransformBooleanPipe implements PipeTransform<any> {
  transform(value: any, { metatype }: TrueArgumentMetadata) {
    if (!metatype || !this.toValidate(metatype)) {
      return value;
    }
    const openApiMetadata = metatype._OPENAPI_METADATA_FACTORY();
    Object.keys(value).forEach(key => {
      if (
        typeof openApiMetadata?.[key]?.type()() === "boolean" &&
        typeof value[key] === "string"
      ) {
        value[key] = value[key] === "true";
      }
    });
    return value;
  }

  // eslint-disable-next-line @typescript-eslint/ban-types
  private toValidate(metatype: Function): boolean {
    // eslint-disable-next-line @typescript-eslint/ban-types
    const types: Function[] = [Boolean];
    return !types.includes(metatype);
  }
}