From a074952678d44553894bd4acf24d8b194e9aa9da Mon Sep 17 00:00:00 2001
From: Youwen Wu <youwenw@gmail.com>
Date: Mon, 12 Feb 2024 20:50:00 -0800
Subject: [PATCH] migrated to web workers for client side components

---
 README.md                                 |  14 ++
 src/app/author/[author]/AuthorDisplay.tsx | 170 +++++++++++++++
 src/app/author/[author]/page.tsx          | 178 +---------------
 src/app/components/DataDisplay.tsx        |  49 +++--
 src/app/db/data.ts                        |  38 ++--
 src/app/db/loaders.ts                     | 241 +++++++++++++++++++++-
 6 files changed, 476 insertions(+), 214 deletions(-)
 create mode 100644 src/app/author/[author]/AuthorDisplay.tsx

diff --git a/README.md b/README.md
index 0d4c5e9..413f291 100644
--- a/README.md
+++ b/README.md
@@ -27,3 +27,17 @@ The dummies guide to maintaining a Next.js project:
 - Important: THIS IS NOT JAVASCRIPT! You CANNOT use global variables, window variables, etc, or even stateful variables that are meant to persist beyond a single refresh cycle (which can happen many times per second). Use the STATE for this (see [the module we are using for state management](https://github.com/pmndrs/zustand))
 - Try to define modules for your components instead of putting everything in one file to avoid JANK
 - You should put all static assets like images, icons, sound bytes, etc, in the `public` folder. These assets will be made available at the root directory `/`. For example, if `eecs-wordmark.png` is in `public`, then I can access it from an image element like so: `<img src="/eecs-wordmark.png" />`.
+- VERY IMPORTANT for performance and UI jank purposes:
+  - As you may have noticed, we store all of our data in a super large TypeScript file at `db/data.ts`. This module contains exports for all of our 5 main "databases."
+  - In order to access these databases from your components, there are two **critical** conventions to follow:
+    - If your component is **server side**, then simply import the components like normal (eg `import { documents } from '@/app/db/data`) and use them in your code.
+    - If your component is **client side**, then you should import the data using the utilities available in `db/loaders.ts`. The `loaders` library contains
+      functions which return a Promise that resolve to the requested data. The function will load the very large objects in a separate thread via a Web Worker, which
+      avoids blocking the main UI thread and freezing everything. You can then use the `useSuspenseQuery` hook from `@tanstack/react-query` to load this data in the background while
+      triggering a React Suspense (if you don't set one up yourself, the default site wide loading bar will be used). This helps vastly reduce UI jank when trying to load the entire
+      mega data object directly into memory.
+  - Not sure whether you're in a client or server side component? If your component has the `'use client'` directive at the top of its file, then it's a client side component.
+    Otherwise, by default, it should be a server side component.
+  - Footnote: why don't I have to use the utilities in `db/loaders.ts` to asynchronously load the data in server side components?
+    - Next.js will automatically pre-render all server side components into static HTML, which means there will be no performance impact (and in fact performance loss at build time)
+      to loading the entire objects into memory.
diff --git a/src/app/author/[author]/AuthorDisplay.tsx b/src/app/author/[author]/AuthorDisplay.tsx
new file mode 100644
index 0000000..1c32ba5
--- /dev/null
+++ b/src/app/author/[author]/AuthorDisplay.tsx
@@ -0,0 +1,170 @@
+import Link from 'next/link'
+import { Fragment } from 'react'
+import { affiliations, nationalities, authors } from '../../db/data'
+import { Zilla_Slab } from 'next/font/google'
+
+const zillaSlab = Zilla_Slab({ subsets: ['latin'], weight: ['500'] })
+
+export default function AuthorDisplay({
+  author,
+}: Readonly<{ author: string }>) {
+  const data = authors[author]
+  const { name, affiliation, image, nationality, formerAffiliations } = data
+
+  const MainPosition = () => {
+    const mainAffiliationShort = affiliation[0].split('@')[1]
+    const mainPosition = affiliation[0].split('@')[0]
+    const mainAffiliation = affiliations[mainAffiliationShort]
+    const { website } = data
+    return (
+      <>
+        <span>{mainPosition} at </span>
+        <Link href={`/affiliation/${mainAffiliationShort}`}>
+          {mainAffiliation.name}
+        </Link>
+        {website ? (
+          <div className='mt-2'>
+            Visit {name.nickname ? name.nickname : name.first} at:{' '}
+            <a href={website} target='_blank'>
+              {website}
+            </a>
+          </div>
+        ) : null}
+        <div className='my-4 max-h-12 flex flex-wrap'>
+          {affiliation.map((a: string) => (
+            <Link key={a} href={`/affiliation/${a.split('@')[1]}`}>
+              <img
+                src={affiliations[a.split('@')[1]].image}
+                alt={affiliations[a.split('@')[1]].name}
+                className='h-12 mr-2'
+              />
+            </Link>
+          ))}
+        </div>
+      </>
+    )
+  }
+
+  const OtherPositions = () => {
+    if (affiliation.length === 1) return
+    return (
+      <>
+        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>
+          Other Positions:
+        </h1>
+        {affiliation.slice(1).map((a: string, i: number) => {
+          const position = a.split('@')[0]
+          const affiliation = affiliations[a.split('@')[1]].name
+          return (
+            <Fragment key={`${position}@${affiliation}`}>
+              <span className='text-slate-500 text-lg'>
+                {position} at{' '}
+                <Link href={`/affiliation/${a.split('@')[1]}`}>
+                  {affiliation}
+                </Link>
+              </span>
+            </Fragment>
+          )
+        })}
+      </>
+    )
+  }
+
+  const FormerPositions = () => {
+    if (!formerAffiliations) return null
+    return (
+      <>
+        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>
+          Former Positions:
+        </h1>
+        {formerAffiliations?.map((a: string, i: number) => {
+          const position = a.split('@')[0]
+          const affiliation = affiliations[a.split('@')[1]].name
+
+          return (
+            <Fragment key={`${position}@${affiliation}`}>
+              <span className='text-slate-500 text-lg'>
+                {position} at{' '}
+                <Link href={`/affiliation/${a.split('@')[1]}`}>
+                  {affiliation}
+                </Link>
+              </span>
+            </Fragment>
+          )
+        })}
+      </>
+    )
+  }
+
+  const NationalityDisplay = ({
+    nationality,
+  }: Readonly<{ nationality: string }>) => {
+    const nationalityData = nationalities[nationality]
+    const { demonym, flag } = nationalityData
+    return (
+      <div className='flex items-center'>
+        <img
+          src={flag}
+          className='w-10 border-2 border-slate-200'
+          alt={`${demonym} flag`}
+        />
+        <span className='mx-3 font-semibold'>{demonym}</span>
+      </div>
+    )
+  }
+
+  const Bio = () => {
+    const { bio } = data
+    if (!bio) return null
+
+    return (
+      <>
+        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>Bio:</h1>
+        <p>{bio}</p>
+      </>
+    )
+  }
+
+  return (
+    <div>
+      <div className='grid grid-cols-1 md:grid-cols-2 items-center max-w-3xl mx-auto'>
+        <div className='aspect-square w-[60vw] md:w-[30vw] lg:w-[20vw] 2xl:w-[15vw] overflow-hidden mx-auto mb-4'>
+          <img
+            alt='profile'
+            className='rounded-full mx-auto object-cover w-full h-full border-slate-800 border-4'
+            src={image}
+          />
+        </div>
+        <div>
+          <div>
+            <span
+              className={`${zillaSlab.className} font-bold text-5xl text-center md:text-left`}
+            >
+              {name.first}
+              {name.nickname ? ` "${name.nickname}"` : null} {name.last}
+            </span>
+            <div className='text-slate-600 text-md sm:text-lg mt-4'>
+              <MainPosition />
+            </div>
+          </div>
+        </div>
+      </div>
+      <div className='max-w-3xl mx-auto grid grid-cols-1 justify-center'>
+        <hr className='mx-auto w-full h-1 border-0 bg-slate-200 my-2 rounded-md' />
+        <OtherPositions />
+        <FormerPositions />
+        <h1 className='text-3xl md:my-6 my-4 font-serif'>
+          Ethnicity and Nationality:
+        </h1>
+        <div className='flex gap-2 flex-wrap'>
+          {nationality.map((n: string) => (
+            <Fragment key={n}>
+              <NationalityDisplay nationality={n} />
+            </Fragment>
+          ))}
+        </div>
+        <Bio />
+      </div>
+    </div>
+  )
+}
diff --git a/src/app/author/[author]/page.tsx b/src/app/author/[author]/page.tsx
index 48f02e2..0942ac5 100644
--- a/src/app/author/[author]/page.tsx
+++ b/src/app/author/[author]/page.tsx
@@ -1,10 +1,5 @@
-import { authors, affiliations, nationalities } from '../../db/data'
-import { Zilla_Slab } from 'next/font/google'
-import Link from 'next/link'
-import { notFound } from 'next/navigation'
-import { Fragment, Suspense } from 'react'
-
-const zillaSlab = Zilla_Slab({ subsets: ['latin'], weight: ['500'] })
+import AuthorDisplay from './AuthorDisplay'
+import { authors } from '@/app/db/data'
 
 export function generateStaticParams() {
   const authorsList = Object.keys(authors)
@@ -16,172 +11,5 @@ export default function Page({
 }: Readonly<{
   params: { author: string }
 }>) {
-  const authorData = authors[params.author]
-  // console.log(authorData)
-  if (!authorData) {
-    notFound()
-  }
-
-  const { name, affiliation, image, nationality, formerAffiliations } =
-    authorData
-
-  const MainPosition = () => {
-    const mainAffiliationShort = affiliation[0].split('@')[1]
-    const mainPosition = affiliation[0].split('@')[0]
-    const mainAffiliation = affiliations[mainAffiliationShort]
-    return (
-      <>
-        <span>{mainPosition} at </span>
-        <Link href={`/affiliation/${mainAffiliationShort}`}>
-          {mainAffiliation.name}
-        </Link>
-        {authorData.website ? (
-          <div className='mt-2'>
-            Visit{' '}
-            {authorData.name.nickname
-              ? authorData.name.nickname
-              : authorData.name.first}{' '}
-            at:{' '}
-            <a href={authorData.website} target='_blank'>
-              {authorData.website}
-            </a>
-          </div>
-        ) : null}
-        <div className='my-4 max-h-12 flex flex-wrap'>
-          {affiliation.map((a: string) => (
-            <Link key={a} href={`/affiliation/${a.split('@')[1]}`}>
-              <img
-                src={affiliations[a.split('@')[1]].image}
-                alt={affiliations[a.split('@')[1]].name}
-                className='h-12 mr-2'
-              />
-            </Link>
-          ))}
-        </div>
-      </>
-    )
-  }
-
-  const OtherPositions = () => {
-    if (affiliation.length === 1) return
-    return (
-      <>
-        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>
-          Other Positions:
-        </h1>
-        {affiliation.slice(1).map((a: string, i: number) => {
-          const position = a.split('@')[0]
-          const affiliation = affiliations[a.split('@')[1]].name
-          return (
-            <Fragment key={`${position}@${affiliation}`}>
-              <span className='text-slate-500 text-lg'>
-                {position} at{' '}
-                <Link href={`/affiliation/${a.split('@')[1]}`}>
-                  {affiliation}
-                </Link>
-              </span>
-            </Fragment>
-          )
-        })}
-      </>
-    )
-  }
-
-  const FormerPositions = () => {
-    if (!formerAffiliations) return null
-    return (
-      <>
-        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>
-          Former Positions:
-        </h1>
-        {formerAffiliations?.map((a: string, i: number) => {
-          const position = a.split('@')[0]
-          const affiliation = affiliations[a.split('@')[1]].name
-
-          return (
-            <Fragment key={`${position}@${affiliation}`}>
-              <span className='text-slate-500 text-lg'>
-                {position} at{' '}
-                <Link href={`/affiliation/${a.split('@')[1]}`}>
-                  {affiliation}
-                </Link>
-              </span>
-            </Fragment>
-          )
-        })}
-      </>
-    )
-  }
-
-  const NationalityDisplay = ({
-    nationality,
-  }: Readonly<{ nationality: string }>) => {
-    const nationalityData = nationalities[nationality]
-    const { demonym, flag } = nationalityData
-    return (
-      <div className='flex items-center'>
-        <img
-          src={flag}
-          className='w-10 border-2 border-slate-200'
-          alt={`${demonym} flag`}
-        />
-        <span className='mx-3 font-semibold'>{demonym}</span>
-      </div>
-    )
-  }
-
-  const Bio = () => {
-    const { bio } = authorData
-    if (!bio) return null
-
-    return (
-      <>
-        <h1 className='text-3xl md:mt-6 mt-4 mb-2 font-serif'>Bio:</h1>
-        <p>{authorData.bio}</p>
-      </>
-    )
-  }
-
-  return (
-    <div>
-      <div className='grid grid-cols-1 md:grid-cols-2 items-center max-w-3xl mx-auto'>
-        <div className='aspect-square w-[60vw] md:w-[30vw] lg:w-[20vw] 2xl:w-[15vw] overflow-hidden mx-auto mb-4'>
-          <img
-            alt='profile'
-            className='rounded-full mx-auto object-cover w-full h-full border-slate-800 border-4'
-            src={image}
-          />
-        </div>
-        <div>
-          <div>
-            <span
-              className={`${zillaSlab.className} font-bold text-5xl text-center md:text-left`}
-            >
-              {name.first}
-              {name.nickname ? ` "${name.nickname}"` : null} {name.last}
-            </span>
-            <div className='text-slate-600 text-md sm:text-lg mt-4'>
-              <MainPosition />
-            </div>
-          </div>
-        </div>
-      </div>
-      <div className='max-w-3xl mx-auto grid grid-cols-1 justify-center'>
-        <hr className='mx-auto w-full h-1 border-0 bg-slate-200 my-2 rounded-md' />
-        <OtherPositions />
-        <FormerPositions />
-        <h1 className='text-3xl md:my-6 my-4 font-serif'>
-          Ethnicity and Nationality:
-        </h1>
-        <div className='flex gap-2 flex-wrap'>
-          {nationality.map((n: string) => (
-            <Fragment key={n}>
-              <NationalityDisplay nationality={n} />
-            </Fragment>
-          ))}
-        </div>
-        <Bio />
-      </div>
-    </div>
-  )
+  return <AuthorDisplay author={params.author} />
 }
diff --git a/src/app/components/DataDisplay.tsx b/src/app/components/DataDisplay.tsx
index 16a6868..ce800b5 100644
--- a/src/app/components/DataDisplay.tsx
+++ b/src/app/components/DataDisplay.tsx
@@ -1,10 +1,8 @@
 import { Fragment } from 'react'
 import Link from 'next/link'
-import {
-  topics as topicList,
-  authors as authorList,
-  reviewer,
-} from '@/app/db/data'
+import { reviewer } from '@/app/db/data'
+import { loadAllTopics, loadAllAuthors } from '@/app/db/loaders'
+import { useSuspenseQuery } from '@tanstack/react-query'
 
 export const Code = ({
   code,
@@ -54,6 +52,18 @@ export const Topics = ({
   topics,
   showTitle = true,
 }: Readonly<{ topics: string[]; showTitle?: boolean }>) => {
+  'use client'
+
+  const { data, error } = useSuspenseQuery({
+    queryKey: ['topics_all'],
+    queryFn: () => {
+      const data = loadAllTopics()
+      return data
+    },
+  })
+  if (error) throw error
+  const topicList = data
+
   return (
     <>
       {showTitle ? <span className='font-bold'>Topics: </span> : null}
@@ -72,6 +82,19 @@ export const Topics = ({
 export const Authors = ({
   authors,
 }: Readonly<{ authors: string[]; noLink?: boolean }>) => {
+  'use client'
+
+  const { data, error } = useSuspenseQuery({
+    queryKey: ['authors_all'],
+    queryFn: () => {
+      const data = loadAllAuthors()
+      return data
+    },
+  })
+  if (error) throw error
+
+  const authorList = data
+
   return (
     <>
       {authors.map((a: string, i) => (
@@ -95,20 +118,16 @@ export const Reviewers = ({
   const ReviewerDisplay = ({ r }: Readonly<{ r: reviewer }>) => {
     if (r.profile) {
       return (
-        <>
-          <Link href={`/author/${r.profile}`} target='_blank'>
-            {r.first} {r.last}
-          </Link>
-        </>
+        <Link href={`/author/${r.profile}`} target='_blank'>
+          {r.first} {r.last}
+        </Link>
       )
     }
     if (r.url) {
       return (
-        <>
-          <a href={r.url} target='_blank'>
-            {r.first} {r.last}
-          </a>
-        </>
+        <a href={r.url} target='_blank'>
+          {r.first} {r.last}
+        </a>
       )
     }
     return (
diff --git a/src/app/db/data.ts b/src/app/db/data.ts
index 5bec8e0..4ab5ce5 100644
--- a/src/app/db/data.ts
+++ b/src/app/db/data.ts
@@ -282,14 +282,12 @@ On Day 1 we will discuss the ins and outs of the robot. The Electrical Sub team
   },
 }
 
-export interface Topics {
-  [key: string]: {
-    name: string
-    description: string
-    wiki: string
-  }
+export interface Topic {
+  name: string
+  description: string
+  wiki: string
 }
-export const topics: Topics = {
+export const topics: { [key: string]: Topic } = {
   frc: {
     name: 'FIRST Robotics Competition',
     description:
@@ -499,16 +497,14 @@ export const authors: { [key: string]: Author } = {
   },
 }
 
-export interface Affiliations {
-  [key: string]: {
-    name: string
-    short: string
-    image: string
-    description: string
-  }
+export interface Affiliation {
+  name: string
+  short: string
+  image: string
+  description: string
 }
 
-export const affiliations: Affiliations = {
+export const affiliations: { [key: string]: Affiliation } = {
   '1280-mech': {
     name: "Team 1280, the Ragin' C Biscuits, Mechanical Subteam",
     short: '1280 Mech',
@@ -659,14 +655,12 @@ Raid Zero's influence extends beyond the technical achievements in robotics comp
   },
 }
 
-export interface Nationalities {
-  [key: string]: {
-    name: string
-    demonym: string
-    flag: string
-  }
+export interface Nationality {
+  name: string
+  demonym: string
+  flag: string
 }
-export const nationalities: Nationalities = {
+export const nationalities: { [key: string]: Nationality } = {
   pak: {
     name: 'Pakistan',
     demonym: 'Pakistani',
diff --git a/src/app/db/loaders.ts b/src/app/db/loaders.ts
index af4bcce..2af5727 100644
--- a/src/app/db/loaders.ts
+++ b/src/app/db/loaders.ts
@@ -1,4 +1,4 @@
-import { Document, Author } from './data'
+import { Document, Author, Affiliation, Topic, Nationality } from './data'
 
 export const loadDocument = (id: string): Promise<Document> => {
   return new Promise((resolve, reject) => {
@@ -67,7 +67,7 @@ export const loadAllAuthors = (): Promise<{ [key: string]: Author }> => {
   return new Promise((resolve, reject) => {
     if (typeof Worker !== 'undefined') {
       const worker = new Worker(
-        new URL('./workers/documentLoader.worker.ts', import.meta.url),
+        new URL('./workers/authorLoader.worker.ts', import.meta.url),
         { type: 'module' }
       )
 
@@ -91,3 +91,240 @@ export const loadAllAuthors = (): Promise<{ [key: string]: Author }> => {
     }
   })
 }
+
+export const loadAuthor = (id: string): Promise<Author> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/authorLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Author }>) => {
+        const data = e.data
+        const author: Author | undefined = data[id]
+        if (!author) {
+          return reject(new Error('404'))
+        } else {
+          resolve(author)
+        }
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          `Web Workers are not supported in this environment. Please avoid using a prehistoric browser. 
+          If nothing else seems wrong, this error message is probably showing up due to ghosts in your browser.`
+        )
+      )
+    }
+  })
+}
+
+export const loadAffiliation = (id: string): Promise<Affiliation> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/affiliationLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Affiliation }>) => {
+        const data = e.data
+        const affiliation: Affiliation | undefined = data[id]
+        if (!affiliation) {
+          return reject(new Error('404'))
+        } else {
+          resolve(affiliation)
+        }
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          `Web Workers are not supported in this environment. Please avoid using a prehistoric browser. 
+          If nothing else seems wrong, this error message is probably showing up due to ghosts in your browser.`
+        )
+      )
+    }
+  })
+}
+
+export const loadAllAffiliations = (): Promise<{
+  [key: string]: Affiliation
+}> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/affiliationLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Affiliation }>) => {
+        resolve(e.data)
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          'Web Workers are not supported in this environment. Please avoid using a prehistoric browser.'
+        )
+      )
+    }
+  })
+}
+
+export const loadTopic = (id: string): Promise<Topic> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/topicLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Topic }>) => {
+        const data = e.data
+        const topic: Topic | undefined = data[id]
+        if (!topic) {
+          return reject(new Error('404'))
+        } else {
+          resolve(topic)
+        }
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          `Web Workers are not supported in this environment. Please avoid using a prehistoric browser. 
+          If nothing else seems wrong, this error message is probably showing up due to ghosts in your browser.`
+        )
+      )
+    }
+  })
+}
+
+export const loadAllTopics = (): Promise<{
+  [key: string]: Topic
+}> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/topicLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Topic }>) => {
+        resolve(e.data)
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          'Web Workers are not supported in this environment. Please avoid using a prehistoric browser.'
+        )
+      )
+    }
+  })
+}
+
+export const loadNationality = (id: string): Promise<Nationality> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/nationalityLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Nationality }>) => {
+        const data = e.data
+        const nationality: Nationality | undefined = data[id]
+        if (!nationality) {
+          return reject(new Error('404'))
+        } else {
+          resolve(nationality)
+        }
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          `Web Workers are not supported in this environment. Please avoid using a prehistoric browser. 
+          If nothing else seems wrong, this error message is probably showing up due to ghosts in your browser.`
+        )
+      )
+    }
+  })
+}
+
+export const loadAllNationalities = (): Promise<{
+  [key: string]: Nationality
+}> => {
+  return new Promise((resolve, reject) => {
+    if (typeof Worker !== 'undefined') {
+      const worker = new Worker(
+        new URL('./workers/topicLoader.worker.ts', import.meta.url),
+        { type: 'module' }
+      )
+
+      worker.onmessage = (e: MessageEvent<{ [key: string]: Nationality }>) => {
+        resolve(e.data)
+        worker.terminate()
+      }
+
+      worker.onerror = (error) => {
+        reject(error)
+        worker.terminate()
+      }
+
+      worker.postMessage('LOAD')
+    } else {
+      reject(
+        new Error(
+          'Web Workers are not supported in this environment. Please avoid using a prehistoric browser.'
+        )
+      )
+    }
+  })
+}