betafcc’s gists

betafcc / reveal.ts

Last active February 6, 2025 13:07

Expand type aliases from a typescript file

	import { readFileSync } from 'node:fs'
	import { resolve } from 'node:path'
	import JSON5 from 'json5'
	import ts from 'typescript'
	import * as prettier from 'prettier'

	/**
	* reveal all top level `type` declarations from a file
	*/
	export const reveal = async (sourcePath: string) => {

betafcc / Permutation.d.ts

Last active October 29, 2024 15:39

Typescript Union Permutation, count of keys in an object, count of cases in an Union

	/**
	* @example
	* type P = Permutation<1 \| 2 \| 3>
	* // [1, 2, 3] \| [1, 3, 2] \| [2, 1, 3] \| [2, 3, 1] \| [3, 1, 2] \| [3, 2, 1]
	*/
	export type Permutation<U, T = U> = [U] extends [never]
	? []
	: T extends unknown
	? [T, ...Permutation<Exclude<U, T>>]
	: never

betafcc / apolloUtils.ts

Created May 17, 2022 10:12

	import { DocumentNode } from 'graphql'
	import {
	gql,
	QueryHookOptions,
	QueryResult,
	TypedDocumentNode,
	useQuery,
	} from '@apollo/client'

	export type Query<TData, TVariables> =

betafcc / touchbar-select.js

Created May 8, 2021 14:05

Opens a select in the touchbar

	#!/usr/bin/env electron
	const { app, BrowserWindow, TouchBar } = require("electron")

	app.whenReady().then(() => {
	const window = new BrowserWindow({
	titleBarStyle: "hiddenInset",
	width: 0,
	height: 0,
	})
	window.loadURL("about:blank")

betafcc / csv-mysql.bash

Last active May 7, 2021 03:33

Easily uploads a csv to mysql via stdin

	#!/usr/bin/env bash
	set -euo pipefail

	SEP="${SEP:=,}"
	TER="${TER:=\n}"
	TABLE="${1}"; shift # first positional argument is the tablename
	CMD="${@}" # the rest is the mysql command

	# examples:
	# cat myfile.csv \| csv-mysql mytable mysql -Dtest -uroot --ppassword

betafcc / convert_to_enum.mysql

Last active May 7, 2021 03:30

Automatically converts a column to enum type, getting the values from the column itself

	-- usage: CALL convert_to_enum('my_table', 'my_column');
	DELIMITER $$
	CREATE PROCEDURE `convert_to_enum`(IN tablename TEXT, IN colname TEXT)
	BEGIN
	SET @temp = CONCAT(
	"SELECT CONCAT(\"ENUM('\", GROUP_CONCAT(DISTINCT ",
	colname,
	" ORDER BY ",
	colname,
	" SEPARATOR \"', '\"), \"')\") INTO @temp FROM ",

betafcc / UnionToTuple.ts

Last active February 1, 2020 10:36

Typescript Union to all Union of Tuples possible with it's elements

	// UnionToTuple<1 \| 2 \| 3> -> [3, 2, 1] \| [2, 3, 1] \| [3, 1, 2] \| [1, 3, 2] \| [2, 1, 3] \| [1, 2, 3]
	type UnionToTuple<U> = _UnionToTuple<U, []>[0]

	type _UnionToTuple<U, L extends Array<U>> = Done<U, L> extends true
	? [L] // boxing prevents circulatory reference
	: [_UnionToTuple<U, ConsDistinct<U, L>>[0]]

	// ConsDistinct<(1 \| 2), ([1] \| [2] \| [3])> -> [1, 2] \| [1, 3] \| [2, 1] \| [2, 3]
	type ConsDistinct<A, L extends Array<unknown>> = L extends any
	? A extends any

betafcc / util.ts

Last active January 11, 2020 13:36

Interesting TypeScript utilities

	// Spread<{x: number} & {y: string}> -> {x: number, y: string}
	export type Spread<T> = ReturnType<() => { [P in keyof T]: T[P] }>

	// Merge<{x: number} \| {y: string}> -> {x: number} & {y: string}
	export type Merge<T> = (T extends any ? (k: T) => void : never) extends (k: infer U) => void
	? U
	: never

	// Values<{x: number, y: string}> -> number \| string
	export type Values<T> = T[keyof T]

betafcc / common_path.bash

Created March 14, 2019 09:45

Pure bash equivalent to python's os.path.commonpath

	#!/usr/bin/env bash


	# takes paths in argv, assumes they are in absolute, as if it was outputed by `pwd`
	common_path() {
	if [ "$(printf '%s\n' "${@}" \| sort \| uniq \| wc -l)" -eq 1 ]; then
	printf %s "${1}"
	return
	fi

betafcc / Maybe.bash

Created January 25, 2019 08:57

Brendon betafcc