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TypeScript type resolution without probing

Supporting expressing resolution entirely in code

Problem

TypeScript’s module resolution for type definitions currently heavily relies on probing. Some examples of this are how node_modules/ folders are probed for @types/ packages when a bare specifier is imported that does not provide it’s own types, or how importing a file with a .js extension will resolve types to a sibling file with a .d.ts extension instead.

Probing is problematic for us at Deno, because we are unable to perform any kind of probing when importing files using https:// specifiers. This is because it is neither side-effect free to perform probing on https:// (ie it is observable), and it is incredibly slow because of network round trip times. Non Deno TypeScript users have also reported similar issues with probing due to reliance on network file systems (microsoft/TypeScript#11979). Additionally, probing has a performance impact for all users regardl

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Meta

Key ID: 808AD7C0F245EA46

Subkeys: 412A10CA3031388A, 141C8B418031A4E6, 01A83EB62563811F

Setup GPG

git config --global user.signingkey 808AD7C0F245EA46

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{
  "$schema": "https://dprint.dev/schemas/v0.json",
  "projectType": "openSource",
  "incremental": true,
  "typescript": {
    "deno": true,
    "useTabs": true
  },
  "includes": ["**/*.{ts,tsx,js,jsx}"],
  "excludes": ["**/node_modules"],

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This example demonstrates how to polyfill the "fetch" event in Deno, and gives an example for how this can be used to run Cloudflare Workers in Deno.

To try it locally run the script below, and visit http://0.0.0.0:8080:

$ deno run --allow-net https://gist.githubusercontent.com/lucacasonato/1a30a4fa6ef6c053a93f271675ef93fc/raw/efcdc8e798604e194831830fcb962b50261384b3/example-worker.js

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export default "a";

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setInterval(() => console.log(import.meta.url), 1000);

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These are all modules on deno.land/x that do not have released versions. These will break soon, so please create a tag / release.

If you want your module to be removed from the list because your module is not maintained anymore, you can let me know until August 1st 2020. After that time removing modules and versions will not be possible anymore.

We will keep your module around until August 14th. If you do not release a version by then, your module name will be unreserved from you, and anyone will be able to register this name.

• a0 by @being-curious (https://github.com/being-curious/a0)
• actdb by @searchableguy (https://github.com/searchableguy/actdb)
• adyen_deno by @KadoBOT (https://github.com/KadoBOT/adyen_deno)
• aes_cfb by @hazae41 (https://github.com/hazae41/deno-aes-cfb)

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "adler"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ee2a4ec343196209d6594e19543ae87a39f96d5534d7174822a3ad825dd6ed7e"

[[package]]
name = "alloc-no-stdlib"

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deno run -A --unstable ./main.ts

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import { serve } from "https://deno.land/std@0.55.0/http/server.ts";
const s = serve({ port: 8000 });
console.log("http://localhost:8000/");
const decoder = new TextDecoder();
for await (const req of s) {
  const body = await Deno.readAll(req.body);
  const str = decoder.decode(body);
  console.log(`Body: ${str}`);
  req.respond({ body: str });
}