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a guest Feb 18th, 2018 64 Never
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  1. const allowedExt = [
  2.   '.js',
  3.   '.ico',
  4.   '.css',
  5.   '.png',
  6.   '.jpg',
  7.   '.woff2',
  8.   '.woff',
  9.   '.ttf',
  10.   '.svg',
  11. ];
  12.  
  13. const resolvePath = (file: string) => path.resolve(`../dist/${file}`);
  14.  
  15. @Middleware()
  16. export class FrontendMiddleware implements NestMiddleware {
  17.   resolve(...args: any[]): ExpressMiddleware {
  18.     return (req, res, next) => {
  19.       const { url } = req;
  20.       if (url.indexOf(ROUTE_PREFIX) === 1) {
  21.         // it starts with /api --> continue with execution
  22.         next();
  23.       } else if (allowedExt.filter(ext => url.indexOf(ext) > 0).length > 0) {
  24.         // it has a file extension --> resolve the file
  25.         res.sendFile(resolvePath(url));
  26.       } else {
  27.         // in all other cases, redirect to the index.html!
  28.         res.sendFile(resolvePath('index.html'));
  29.       }
  30.     };
  31.   }
  32. }
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