GingerBear

/**
 *
 * Util function to create type safe state management store with useContext and useReducer. 
 * The mechanism is described by https://kentcdodds.com/blog/how-to-use-react-context-effectively/
 *
 */

import React, { useReducer, createContext, useContext } from 'react';

export type ContextProviderProps = { children: React.ReactNode };

GingerBear

function notNullOrUndefined<T>(x: T | null | undefined): x is T {
  return x !== null && x !== undefined;
}

const arr = [1, 2, null, undefined]; // (number | null | undefined)[]
const arrFiltered = arr.filter(notNullOrUndefined); // number[]

GingerBear

function foo(): null;
function foo(a: number): string;
function foo(a?) {
    if (typeof a === 'number') {
        return '123';
    } else {
        return null;
    }
    
}

GingerBear

function sampleArray(arr, num) {
  if (arr.length <= num) {
    return arr;
  } else {
    const every = Math.floor(arr.length / num);
    const sampleIndex = Array(num)
      .fill(0)
      .map((_, i) => i * every);

    // keep last element

GingerBear

FROM node:10-alpine

# Installs Python 3
RUN apk add --no-cache python3 && \
    python3 -m ensurepip && \
    rm -r /usr/lib/python*/ensurepip && \
    pip3 install --upgrade pip setuptools && \
    if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
    if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && \
    rm -r /root/.cache

GingerBear

const express = require('express');
const path = require('path');
const fs = require('fs');
const proxy = require('http-proxy-middleware');
const app = express();
const proxyConfig = require('./proxy-remote.conf.json');
const port = 4200;

const ngBuildPath = path.join(__dirname, 'dist/projectAbc');
const ngBuildIndex = fs

GingerBear

const express = require('express');
const path = require('path');
const fs = require('fs');
const proxy = require('http-proxy-middleware');
const app = express();
const proxyConfig = require('./proxy-remote.conf.json');
const port = 4200;

const ngBuildPath = path.join(__dirname, 'dist/projectAbc');
const ngBuildIndex = fs

GingerBear

• install appcenter cli https://github.com/Microsoft/appcenter-cli
• appcenter login
• update "name": "GNCUAT", in package.json
• add "react-native": "0.0.0", to dependencies in package.json
• appcenter codepush release-react -a Branding-Brand/GNCIOS -d Latest

GingerBear

type typeA = { a: string };
type typeB = { b: string };
type typeAorB = typeA | typeB;

// type check for union type
function isA(foo: typeA | typeB): foo is typeA {
  return (<typeA>foo).a !== undefined;
}

// usage 

GingerBear

ios

https://www.neglectedpotential.com/2017/04/trusting-custom-root-certificates-on-ios-10-3/

android

https://medium.com/@hackupstate/using-charles-proxy-to-debug-android-ssl-traffic-e61fc38760f7