christophemarois

With the following generic trigger function:

CREATE OR REPLACE FUNCTION allow_updating_only()
 RETURNS trigger
 LANGUAGE plpgsql
AS $function$
DECLARE
  whitelist TEXT[] := TG_ARGV::TEXT[];
  schema_table TEXT;

christophemarois

Use Caddy (brew install caddy) to run localhost sites with custom addresses and https certificates.

1. Run caddy reverse-proxy --from site.localhost --to localhost:3000
2. Visit https://site.localhost/

For a more stable config, create a Caddyfile

site.localhost {
 reverse_proxy localhost:3000

christophemarois

Remove a file from git

Accidentally committed a 4GB file and GitHub (rightly) doesn't let you push? Commited a .env with your social insurance number?

1. Back up the entire repo
2. Run bfg --delete-files [filenames...] (brew install bfg)
3. Follow instructions

christophemarois

Run a local Dockerfile with a local .env file

docker build \

Show complete log

--progress=plain \

Nested dockerfile, useful for monorepos when we want to preserve CWD

christophemarois

export type SingletonAsyncFn<Args extends any[], Result> = {
  getCurrent(): Promise<Result> | null
} & ((...args: Args) => Promise<Result>)

/** Wrap an async function so only one instance runs at the time
 * and concurrent calls await the running instance
 *
 * @example
 * const getRand = makeSingletonAsyncFn(() => new Promise<number>(resolve => setTimeout(() => resolve(Math.random()), 1000)))
 * console.log(await Promise.all([getRand(), getRand()])) // e.g. [0.6214563565449123, 0.6214563565449123] after 1sec

christophemarois

import * as z from 'zod'

function zJson <T extends z.ZodTypeAny> (schema: T) {
  return z.string().transform((val, ctx) => {
    try {
      return JSON.parse(val)
    } catch (err) {
      ctx.addIssue({
        code: z.ZodIssueCode.custom,
        message: 'Invalid JSON',

christophemarois

TS/JS go-to libs

Updated Jan 2024. For looking up trending newer alternatives, use npmtrends. For Nodejs, nodejstoolbox a precompiled list of trends by category.

Universal

Standard libs

Standard libs extend the runtime with convenience helpers, structures and patterns.

christophemarois

type User = {
  name: string
  age: number
}

const users: User[] = [
  { name: 'Adibou', age: 30 },
  { name: 'Bounda', age: 69 },
  { name: 'Adibou', age: 18 },
]

christophemarois

export function createStructuredError<
  ErrorCodes extends Record<any, (data: any) => string>
>(name: string, codes: ErrorCodes) {
  return class StructuredError<
    ErrorCode extends keyof ErrorCodes,
    ErrorData extends Parameters<ErrorCodes[ErrorCode]>[0]
  > extends Error {
    constructor(
      public readonly code: ErrorCode,
      public readonly data: ErrorData

christophemarois

class Emitter<Events extends Record<any, (val: any) => any>> {
  private observers: Map<keyof Events, Set<(val: any) => any>> = new Map()

  on<Name extends keyof Events, Fn extends Events[Name]>(name: Name, fn: Fn) {
    if (!this.observers.has(name)) {
      this.observers.set(name, new Set())
    }

    this.observers.get(name)!.add(fn)