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// https://github.com/metadevpro/openapi3-ts/blob/master/src/model/SpecificationExtension.ts// Suport for Specification Extensions// as described in// https://github.com/OAI/OpenAPI-Specification/blob/3.0.0-rc0/versions/3.0.md#specificationExtensions
//  Specification Extensions//   ^x-export interface ISpecificationExtension {  // Cannot constraint to "^x-" but can filter them later to access to them  [extensionName: string]: any;}
export class SpecificationExtension implements ISpecificationExtension {  // Cannot constraint to "^x-" but can filter them later to access to them  [extensionName: string]: any
  static isValidExtension(extensionName: string) {    return /^x\-/.test(extensionName);  }
  getExtension(extensionName: string): any {    if (!SpecificationExtension.isValidExtension(extensionName)) {      throw new Error(        "Invalid specification extension: '" + extensionName +          "'. Extensions must start with prefix 'x-",      );    }    if (this[extensionName]) {      return this[extensionName];    }    return null;  }  addExtension(extensionName: string, payload: any): void {    if (!SpecificationExtension.isValidExtension(extensionName)) {      throw new Error(        "Invalid specification extension: '" + extensionName +          "'. Extensions must start with prefix 'x-",      );    }    this[extensionName] = payload;  }  listExtensions(): string[] {    let res: string[] = [];    for (let propName in this) {      if (this.hasOwnProperty(propName)) {        if (SpecificationExtension.isValidExtension(propName)) {          res.push(propName);        }      }    }    return res;  }}