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import { MiddlewareTarget } from "../models/middleware-target.ts";import { StaticFilesConfig } from "../models/static-config.ts";import { send } from "../static/send.ts";import { getStaticFile } from "../utils/get-static-file.ts";import { HttpContext } from "../models/http-context.ts";
export class SpaBuilder<TState> implements MiddlewareTarget<TState> {  constructor(private staticConfig: StaticFilesConfig) {}
  onPreRequest(context: HttpContext<TState>) {    return null;  }
  onPostRequest(context: HttpContext<TState>): Promise<void> {    return new Promise<void>(async (resolve, reject) => {      if (await getStaticFile(context, this.staticConfig, false)) {        context.response.setImmediately();      } else {        if (          context.response.result === undefined && this.staticConfig.index &&          !hasUrlExtension(context.request.url)        ) {          if (            await send(              {                request: context.request.serverRequest.request,                response: context.response,              },              this.staticConfig.index,              this.staticConfig,            )          ) {            context.response.setImmediately();          }        }      }      resolve();    });  }}
function hasUrlExtension(url: string): boolean {  const fragments = url.split("/");  return fragments[fragments.length - 1].includes(".");}