christophemarois

// adapted from https://jsr.io/@backend/safe-assignment

type WithErrResultPlain<T> = [Error, null] | [null, T]
type WithErrResult<T> = T extends Promise<infer U>
  ? Promise<WithErrResultPlain<U>>
  : WithErrResultPlain<T>

type WithErr<T> = T extends Promise<unknown>
  ? WithErrResult<T>
  : T extends () => infer U

christophemarois

/** Typed context creation helper
 * @example
 * export const [useLevel, LevelProvider] = createTypedContext<{ level: number }>('LevelContext')
 */
export function createTypedContext<T>(name: string) {
  const Context = createContext<T | null>(null)

  function useEnsuredContext() {
    const ctx = useContext(Context)
    if (ctx === null) {

christophemarois

/* eslint-disable no-console */
/**
 * Represents a deeply readonly version of a type, including nested objects,
 * arrays, sets, and maps.
 * @template T - The type to make deeply readonly.
 */
export type DeepReadonly<T> = T extends (infer R)[]
  ? ReadonlyArray<DeepReadonly<R>>
  : T extends Set<infer R>
  ? ReadonlySet<DeepReadonly<R>>

christophemarois

/** Create a wrapped AbortController that is aborted when a SIGINT/SIGTERM is received.
 * Supports auto-unregistering via explicit resource management.
 *
 * @example
 * using shutdownSignal = new ShutdownSignal()
 * shutdownSignal.throwIfAborted()
 *
 * // or
 * const shutdownSignal = new ShutdownSignal()
 * try { shutdownSignal.throwIfAborted() } finally { shutdownSignal.unregister() }

christophemarois

Cloudflare is a better and free ngrok. With a domain that uses it, set it up like this

1. Setup a tunnel

cloudflared tunnel login
cloudflared tunnel create test
cloudflared tunnel route dns test test.christophemarois.com

christophemarois

/** Transform the password part of a connection string URL into [redacted].
 * Useful for logging. */
export function redactPasswordFromUrl(url: string) {
  return url.replace(/^([^:]+):\/\/([^:]*):([^@]+)@/, '$1://$2:[redacted]@')
}

christophemarois

1. Create an app-specific password for iCloud account (check Bitwarden notes)
2. Use https://github.com/midnightmonster/icloud-calendar-urls to get your calendar's secret URL

curl -s https://raw.githubusercontent.com/midnightmonster/icloud-calendar-urls/master/icloud_calendar_urls | bash

3. In thunderbird, add calendar with your icloud username, secret url and app-specific password

christophemarois

Monitor in Node (PerformanceObserver is not yet implemented in Bun. in bun 1.0.3)

import { collectDefaultMetrics, register } from 'prom-client'

if (req.method === 'GET' && pathname === '/metrics/') {
  return new Response(await register.metrics(), {
    headers: {
      'Content-Type': register.contentType,
 },

christophemarois

/** Array where are elements are expected to be unique by a custom key */
export function zUniqueArray<
  ArrSchema extends z.ZodArray<z.ZodTypeAny, 'many'>,
  UniqueVal,
>(
  uniqueBy: (item: z.infer<ArrSchema>[number]) => UniqueVal,
  schema: ArrSchema,
) {
  return schema.superRefine((items, ctx) => {
    const seen = new Set<UniqueVal>()

christophemarois

# list changed files in a branch compared to its base branch
# usage: git_list_branch_changes [base_branch?] | xargs echo
function git_list_branch_changes {
  local BASE_BRANCH="${1:-main}"
  (git diff --diff-filter=MA --name-only $BASE_BRANCH... && git status --short --porcelain | awk '{print $2}') | sort -u
}