spion

Be careful when feature flags affect any shared mutable state. This for example will cause data loss if the flag value changes during the work:

this.fancyModel = FancyModel.createInitial()
this.rustyModel = RustyModel.createInitial()

async loadData() { 
  let flag = await this.ff.isEnabled('flag');
  let data = await this.fetchData();

spion

type ExtractValuesRecusrively<T> = T extends FormState<infer U>
  ? { [K in keyof U]: ExtractValuesRecusrively<U[K]> }
  : T extends FieldState<infer V>
  ? V
  : never;

// vs

type ExtractValuesRecusrively<State> = State extends FormState<infer InnerForm>
  ? { [FieldKey in keyof InnerForm]: ExtractValuesRecusrively<InnerForm[FieldKey]> }

spion

let types = ../types.dhall sha256:e48e21b807dad217a6c3e631fcaf3e950062310bfb4a8bbcecc330eb7b2f60ed

let defaults = ../defaults.dhall sha256:4450e23dc81975d111650e06c0238862944bf699537af6cbacac9c7e471dfabe

let deployment : types.Deployment = defaults.Deployment // { 
  metadata = defaults.ObjectMeta // { name = "nginx" }, 
  spec = Some ( defaults.DeploymentSpec //  { 
    replicas = Some 2, 
    template = defaults.PodTemplateSpec // { 
      metadata = defaults.ObjectMeta // { 

spion

type PromiseState<T> = {
  state: 'fulfilled', value: T
} | {state: 'pending'} | {state: 'rejected', error: Error};


let wm = new WeakMap<Promise<any>, PromiseState<any>>()

export function asyncCase<T, U>(promise: Promise<T>, handlers: {
  pending?: () => U;
  fulfilled?: (t: T) => U;

spion

In JavaScript, functions have arguments. We can name those arguments so that we can access the values we pass to those functions

function add(a, b) {
  return a + b;
}

We can call these functions normally:

spion

/**
 * Allocate a callback based resource, safely
 *
 * Example:
 * function connectionResource(url) {
 *   return { acquire: async () => pg.connect(url), dispose: async conn => conn.dispose() }
 * }
 * usingPromise(connectionResource(process.env.DATABASE_URL), async conn => {
 *   await conn.query(...);
 *   do other things

spion

/**
 * Implementation of promise dialogs
 */
import { observable, action } from 'mobx';
import * as React from 'react';
import { AppSingleton } from '@h4bff/core';
import { AppContext } from '../router';
import { observer } from 'mobx-react';

interface Resolver<T> {

spion

{"output":{"equalizer":{"state":"true","num-bands":"6","input-gain":"-2","output-gain":"0","split-channels":"false","left":{"band0":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"-7.4","frequency":"222.0","q":"0.230"},"band1":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"4.0","frequency":"30.0","q":"0.470"},"band2":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"-2.2","frequency":"1686.0","q":"1.520"},"band3":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"2.0","frequency":"3090.0","q":"2.080"},"band4":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"-3.1","frequency":"6888.0","q":"1.000"},"band5":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"-1.1","frequency":"10550.0","q":"3.470"}},"right":{"band0":{"type":"Bell","mode":"RLC (BT)","slope":"x1","solo":"false","mute":"false","gain":"-7.4","fre

spion

import React, { useState, useEffect } from 'react';

function useFriendStatus(friendID) {
  const [isOnline, setIsOnline] = useState(null);

  useEffect(() => {
    function handleStatusChange(status) {
      setIsOnline(status.isOnline);
    }

spion

import * as Lint from 'tslint';
import * as ts from 'typescript';

import { inspect } from 'util';

/**
 * This rule will ensure that methods marked with the "@expose" decorator must be declared in at
 * least one interface implemented by the class. It will also ensure that the return type of this
 * method has no excess properties compared to those specified in the interface
 */