andrewbranch

Writing type definitions, on a scale of 1–5

	By hand	With tsc	With 3rd party tool
Ease	1	5	4
Avg. correctness	2	5	2
Flexibility	5	1	3

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Original Tweet

tsc performance consuming .ts vs .d.ts files in npm packages

What if TypeScript libraries published just .ts sources to npm instead of .js and .d.ts files? This might already be tempting for Bun-only libraries, but how will that impact users? This is easy to answer by experimenting on existing libraries that ship .js, .d.ts, and .ts files.

RxJS ships .js and .d.ts files, but also .ts files for debugability purposes. By tweaking its package.json "exports", we can compare tsc performance on this file with imports resolving to .d.ts files vs .ts source files:

import {} from "rxjs";

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# $Id: avrdude.conf.in 1371 2016-02-15 20:15:07Z joerg_wunsch $ -*- text -*-
#
# AVRDUDE Configuration File
#
# This file contains configuration data used by AVRDUDE which describes
# the programming hardware pinouts and also provides part definitions.
# AVRDUDE's "-C" command line option specifies the location of the
# configuration file.  The "-c" option names the programmer configuration
# which must match one of the entry's "id" parameter.  The "-p" option
# identifies which part AVRDUDE is going to be programming and must match

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import { describe, it, beforeEach } from 'mocha';
import assert from 'assert';
import transposeArray from './transpose-array';

describe('transpose-array', () => {
  let array;
  beforeEach(() => array = [0, 1, 2, 3, 4, 5]);
  
  it('works for downward transpositions', () => {
    let result = transposeArray(array, 4, 2);

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// filtered is an Immutable.Seq (lazy sequence) with 307 entries
let withinCountry = filtered.filter(p => p.get('locations').some(isSameCountry(yourLocation)));

let outsideCountry1 = filtered.filter(p => !withinCountry.includes(p));
let outsideCountry2 = filtered.filter(p => !p.get('locations').some(isSameCountry(yourLocation)));
let outsideCountry3 = filtered.toSet().subtract(withinCountry);

return withinCountry.sort(someWayOfSorting)
  .concat(outsideCountryN.sort(someOtherWayOfSorting))
  .take(10);

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function getTestPeople() {
  return [{
    name: "Kylie",
    age: 18
  }, {
    name: "Andrew",
    age: 23
  }, {
    name: "Andrew",
    age: 18

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someAsyncMethod() {
  return new Promise((resolve, reject) => {
    somePromiseReturningMethod().then(x => {
      resolve(doSomethingTo(x));
    });
  });
}

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Keybase proof

I hereby claim:

• I am andrewbranch on github.
• I am andrewbranch (https://keybase.io/andrewbranch) on keybase.
• I have a public key whose fingerprint is 3F80 A965 F914 BC02 8650 E395 22CC A4B1 20C4 27D2

To claim this, I am signing this object:

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var trash = [];

function computationallyIntensiveStuff() {
  trash.push(Math.pow(Math.pow(Math.cos(Math.sin(Math.random())), Math.random()), Math.random() * 100000));
  trash.filter(function (a) { return a > Math.random(); });
}

new Promise(function (resolve, reject) {
  for (var i = 0; i < 1000; i++) {

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class RadioView: UIView {
    
    var selected: Bool = false {
        didSet {
            UIView.animateWithDuration(self.fadeTime) {
                self.inner.alpha = self.selected ? 1 : 0
            }
        }
    }