Auke Posts - Deno

Auke

•Created by Auke on 8/19/2024 in #help

Setup for using npm packages locally + via server.ts

Hi Deno, I have a project in which I use Deno both to execute ts/js files locally to compute features, using a command like: deno run --allow-all --v8-flags=--max-old-space-size=2192 compute.ts This compute.ts script uses .js scripts that are also used in a webpage I serve using a simple server.ts file, which I serve using deno: deno run -A server.ts which contains the following code to serve files:

Deno.serve((req: Request) => {
  let pathname = new URL(req.url).pathname;

  // fonts endpoint
  if (pathname.startsWith("/fonts")) {
    return fonts_endpoint(req, pathname);
  }

  // Canonicalize path
  if (pathname === "/" || pathname === "") {
    pathname = "/index.html";
  }
  const filepath = "." + pathname;
  console.log(filepath);

  const isReadableFile = existsSync(filepath, {
    isReadable: true,
    isFile: true,
  });

  if (isReadableFile) {
    return serveFile(req, filepath);
  }

  // Otherwise the requested resource is not available
  return new Response("404: Not Found", {
    status: 404,
  });
});

Deno.serve((req: Request) => {
  let pathname = new URL(req.url).pathname;

  // fonts endpoint
  if (pathname.startsWith("/fonts")) {
    return fonts_endpoint(req, pathname);
  }

  // Canonicalize path
  if (pathname === "/" || pathname === "") {
    pathname = "/index.html";
  }
  const filepath = "." + pathname;
  console.log(filepath);

  const isReadableFile = existsSync(filepath, {
    isReadable: true,
    isFile: true,
  });

  if (isReadableFile) {
    return serveFile(req, filepath);
  }

  // Otherwise the requested resource is not available
  return new Response("404: Not Found", {
    status: 404,
  });
});

and serves plain html, .js and .ttf files. I have this setup working for a long time, but it is a mess - I have installed npm libraries using npm, access those javascript files by using direct paths: import * as FloBezier from "./node_modules/flo-bezier3/browser/index.js"; and I do this as a solution to have this javascript file working both locally (using deno run cli) and when accessing the file through the browser (using the server.ts above). Is there a more cannonical approach to doing this? Key requirement is being able to use the same js file both locally and in the browser

8 replies

DDeno

•Created by Auke on 5/7/2024 in #help

`deno run` not returning

Hi - I have added the following code to my javascript file, and for some reason the code still executes fine, but it doesn't return anymore, leaving deno running and I have to ctrl-c out of it.

if ("Deno" in window) {
  // Import paper_js, as it is not loaded by the index.html script include
  const paper_import = await import("npm:paper");
  const paper = paper_import.default;
  await import("npm:paper-jsdom");
  globalThis.paper = paper;
  paper.setup();
  console.log("setup paper");
}

if ("Deno" in window) {
  // Import paper_js, as it is not loaded by the index.html script include
  const paper_import = await import("npm:paper");
  const paper = paper_import.default;
  await import("npm:paper-jsdom");
  globalThis.paper = paper;
  paper.setup();
  console.log("setup paper");
}

This prints out the setup paper. I have added some prints surrounding my entry point main, and those all print as well:

console.log("doing");
try {
  await main();
  console.log("done!");
} catch (error) {
  console.error("An error occursed:", error);
} finally {
  // Keep the program running until all asynchronous operations are complete
  await new Promise((resolve) => setTimeout(resolve, 0));
  console.log("now done");
}
console.log("really done");

console.log("doing");
try {
  await main();
  console.log("done!");
} catch (error) {
  console.error("An error occursed:", error);
} finally {
  // Keep the program running until all asynchronous operations are complete
  await new Promise((resolve) => setTimeout(resolve, 0));
  console.log("now done");
}
console.log("really done");

So what could be keeping the deno instance from returning/finishing?

25 replies