kawanet’s gists

kawanet / node-assert.shim.ts

Last active May 4, 2026 15:26

a mini subset of node:assert for browser

	// Browser-side shim for `node:assert`. Aliased into the test bundle
	// by the rollup test config. Tests source-import as
	// `import {strict as assert} from "node:assert"`, so this file
	// exports `strict` matching that surface.
	//
	// Canonical: https://gist.github.com/kawanet/5214f8731e1a8ab1f0accd1a2c0538b0

	export const strict = {
	// Truthy check. Mirrors `assert.ok(value, message?)` in node:assert.
	ok(value: unknown, message?: string): void {

kawanet / node-test.shim.ts

Last active May 4, 2026 17:05

a mini subset of node:test for browser

	// Browser-side shim for `node:test`. Aliased into the test bundle by
	// the rollup test config so the test sources can import the same
	// names (`describe`, `it`, `before`, `after`) under both Node (real
	// node:test) and the browser (this file).
	//
	// Canonical: https://gist.github.com/kawanet/5130469aa49b613fb68c8e6781a2ed46
	//
	// Test results are rendered into `<ul id="results">` on the host
	// page (the element is created on demand if absent).
	//

kawanet / exec-service.sh

Last active July 26, 2025 13:25

Loop-run systemd’s ExecStart command

	#!/bin/bash
	#---
	## @file exec-service.sh
	## @brief Loop-run systemd’s ExecStart command
	## @see https://gist.github.com/kawanet/2eadbbf03f3619a28bb7cd6f36985f8d
	## @author Yusuke Kawasaki
	## @license MIT
	#---

	die () {

kawanet / svg-to-favicon.sh

Created March 18, 2023 13:35

SVG を favicon.ico に変換する

	#!/usr/bin/env bash

	convert -background none image.svg -define icon:auto-resize=64,48,32,16 favicon.ico

kawanet / sjis-to-utf8-bom.sh

Created February 2, 2023 00:18

Shift_JIS CP932 を BOM 付き UTF-8 に変換するワンライナー

node -e 'require("fs").writeFileSync(process.argv[1], "\uFEFF" + require("iconv-cp932").decode(require("fs").readFileSync(process.argv[1])))' filename.csv

kawanet / getTimezoneOffset.js

Created November 30, 2022 14:41

	const getTimezoneOffset = (timeZone, dt) => new Intl.DateTimeFormat("en-US", {timeZoneName: "longOffset", timeZone}).formatToParts(dt).find(v => v.type === "timeZoneName")?.value;

	getTimezoneOffset("America/New_York", new Date()); // => "GMT-05:00"

	getTimezoneOffset("America/New_York"); // => "GMT-05:00"

	getTimezoneOffset("invalid"); // => Uncaught RangeError: Invalid time zone specified:

kawanet / jp-neighboring-pref.csv

Last active June 6, 2023 12:31

jp-neighboring-pref - 隣接都道府県の一覧をCSVで取り出す（MITライセンス） https://qiita.com/kawanet/items/f753df6249c14ef67a04

01	北海道	/	/
02	青森県	/03/05/	/岩手県/秋田県/
03	岩手県	/02/04/05/	/青森県/宮城県/秋田県/
04	宮城県	/03/05/06/07/	/岩手県/秋田県/山形県/福島県/
05	秋田県	/02/03/04/06/	/青森県/岩手県/宮城県/山形県/
06	山形県	/04/05/07/15/	/宮城県/秋田県/福島県/新潟県/
07	福島県	/04/06/08/09/10/15/	/宮城県/山形県/茨城県/栃木県/群馬県/新潟県/
08	茨城県	/07/09/11/12/	/福島県/栃木県/埼玉県/千葉県/
09	栃木県	/07/08/10/11/	/福島県/茨城県/群馬県/埼玉県/
10	群馬県	/07/09/11/15/20/	/福島県/栃木県/埼玉県/新潟県/長野県/

kawanet / drawColorFn.html

Last active December 11, 2021 07:23

drawPixel(output, pos, ...color) is slow

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>benchmark</title>
	</head>
	<body>
	Open DevTools
	<script>
	setTimeout(function() {

kawanet / text-decoder-bench.js

Created September 3, 2021 14:12

Benchmarks for TextDecoder and TextEncoder

	#!/usr/bin/env node

	/**
	* text-decoder-bench.js
	* @copyright Kawanet
	* @licence MIT
	* @see https://gist.github.com/kawanet/a66a0e2657464c57bcff2249286d3a24
	*/

	const readString = (buffer, offset, length) => {

kawanet / type-transformations.ts

Created June 3, 2021 02:47

	// オンデマンドに T や Promise<T> を返す関数実装を許容する
	type OnDemandType<T> = (T \| (() => T) \| (() => Promise<T>));

	// すべてのプロパティがオンデマンド対応
	type LazyType<T> = { [K in keyof T]: OnDemandType<T[K]> };

	// T や Promise<T> を返す関数実装なら T を取り出す
	type ResolvedType<T> = (T extends () => Promise<infer P> ? P : T extends () => infer P ? P : T);

	// T のうち __typename プロパティを無視して、残りのプロパティは必須とする

Yusuke Kawasaki kawanet