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TypeScript:

/**
 * This Fetch API interface allows you to perform various actions on HTTP
 * request and response headers. These actions include retrieving, setting,
 * adding to, and removing. A Headers object has an associated header list,
 * which is initially empty and consists of zero or more name and value
 * pairs.
 *
 * You can add to this using methods like append()

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Untagged Union Proposal for ReScript

Introduction

• Brief introduction to ReScript
• Motivation for untagged variants
• High-level overview of the proposal

Detailed Design

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module.exports = [
  "and",
  "as",
  "asr",
  "assert",
  "begin",
  "class",
  "constraint",
  "do",
  "while",

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type User {
  id: ID!
  name: String!
}

type Group {
  id: ID!
  name: String!
  school: School!
}

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// collectConnectionNodes.js - Extracts and filters all nodes from a connection and returns it in a list, preserving the type information.
// @flow
export function collectConnectionNodes<T>(
  connectionObj: ?{
    +edges: ?$ReadOnlyArray<?{
      +node: ?T
    }>
  }
): $ReadOnlyArray<T> {
  if (connectionObj && connectionObj.edges && connectionObj.edges.length > 0) {

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// @flow
import { graphql, createPaginationContainer } from 'react-relay';
import type { UserPetsList_user } from './__generated__/UserPetsList_user.graphql';
import * as React from 'react';
import SinglePet from './SinglePet';

type Props = {|
  relay: {
    hasMore: () => boolean,
    loadMore(pageSize: number, callback: ?(error: ?Error) => void): ?Object,

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// @flow
import * as React from 'react';
import { queryMock } from '../../__testUtils__/queryMock'; // Or wherever your queryMock is located
import { App } from '../App';
import { render, wait } from 'react-testing-library';

describe('App', () => {
  it('should render the current user count', async () => {
    /**
     * App fetches the query AppQuery. Here, we mock all requests for that query.

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// @flow
import * as React from 'react';
import { QueryRenderer, graphql } from 'react-relay';
import { environment } from '../config/createRelayEnvironment';
import type { AppQueryResponse } from './__generated__/AppQuery.graphql';

const query = graphql`
  query AppQuery {
    viewer {
      id