Merge branch 'next-ts-conversions' into 'next'

Next: TypeScript conversions

See merge request soapbox-pub/soapbox-fe!1254

app/soapbox/base_polyfills.ts

@@ -3,9 +3,12 @@
 import 'intl';
 import 'intl/locale-data/jsonp/en';
 import 'es6-symbol/implement';
+// @ts-ignore: No types
 import includes from 'array-includes';
+// @ts-ignore: No types
 import isNaN from 'is-nan';
 import assign from 'object-assign';
+// @ts-ignore: No types
 import values from 'object.values';
 
 import { decode as decodeBase64 } from './utils/base64';
@@ -30,7 +33,7 @@ if (!HTMLCanvasElement.prototype.toBlob) {
   const BASE64_MARKER = ';base64,';
 
   Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
-    value(callback, type = 'image/png', quality) {
+    value(callback: any, type = 'image/png', quality: any) {
       const dataURL = this.toDataURL(type, quality);
       let data;
 

app/soapbox/components/sidebar-navigation.tsx

@@ -1,4 +1,4 @@
-import { Map as ImmutableMap, OrderedSet as ImmutableOrderedSet } from 'immutable';
+import { OrderedSet as ImmutableOrderedSet } from 'immutable';
 import React from 'react';
 import { FormattedMessage } from 'react-intl';
 
@@ -22,7 +22,7 @@ const SidebarNavigation = () => {
   const followRequestsCount = useAppSelector((state) => state.user_lists.getIn(['follow_requests', 'items'], ImmutableOrderedSet()).count());
   // const dashboardCount = useAppSelector((state) => state.admin.openReports.count() + state.admin.awaitingApproval.count());
 
-  const baseURL = account ? getBaseURL(ImmutableMap(account)) : '';
+  const baseURL = account ? getBaseURL(account) : '';
   const features = getFeatures(instance);
 
   const makeMenu = (): Menu => {

app/soapbox/extra_polyfills.ts

@@ -2,6 +2,6 @@
 
 import 'intersection-observer';
 import 'requestidlecallback';
-import objectFitImages  from 'object-fit-images';
+import objectFitImages from 'object-fit-images';
 
 objectFitImages();

app/soapbox/features/onboarding/steps/avatar-selection-step.tsx

@@ -37,7 +37,9 @@ const AvatarSelectionStep = ({ onNext }: { onNext: () => void }) => {
 
   const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
     const maxPixels = 400 * 400;
-    const [rawFile] = event.target.files || [] as any;
+    const rawFile = event.target.files?.item(0);
+
+    if (!rawFile) return;
 
     resizeImage(rawFile, maxPixels).then((file) => {
       const url = file ? URL.createObjectURL(file) : account?.avatar as string;

app/soapbox/features/onboarding/steps/cover-photo-selection-step.tsx

@@ -38,7 +38,9 @@ const CoverPhotoSelectionStep = ({ onNext }: { onNext: () => void }) => {
 
   const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
     const maxPixels = 1920 * 1080;
-    const [rawFile] = event.target.files || [] as any;
+    const rawFile = event.target.files?.item(0);
+
+    if (!rawFile) return;
 
     resizeImage(rawFile, maxPixels).then((file) => {
       const url = file ? URL.createObjectURL(file) : account?.header as string;

app/soapbox/globals.ts

@@ -4,17 +4,20 @@
  */
 import { changeSettingImmediate } from 'soapbox/actions/settings';
 
-export const createGlobals = store => {
+import type { Store } from 'soapbox/store';
+
+/** Add Soapbox globals to the window. */
+export const createGlobals = (store: Store) => {
   const Soapbox = {
-    // Become a developer with `Soapbox.isDeveloper()`
+    /** Become a developer with `Soapbox.isDeveloper()` */
-    isDeveloper: (bool = true) => {
+    isDeveloper: (bool = true): boolean => {
       if (![true, false].includes(bool)) {
         throw `Invalid option ${bool}. Must be true or false.`;
       }
-      store.dispatch(changeSettingImmediate(['isDeveloper'], bool));
+      store.dispatch(changeSettingImmediate(['isDeveloper'], bool) as any);
       return bool;
     },
   };
 
-  window.Soapbox = Soapbox;
+  (window as any).Soapbox = Soapbox;
 };

app/soapbox/is_mobile.js

@@ -1,29 +0,0 @@
-'use strict';
-
-import { supportsPassiveEvents } from 'detect-passive-events';
-
-const LAYOUT_BREAKPOINT = 630;
-
-export function isMobile(width) {
-  return width <= LAYOUT_BREAKPOINT;
-}
-
-const iOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
-
-let userTouching = false;
-const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
-
-function touchListener() {
-  userTouching = true;
-  window.removeEventListener('touchstart', touchListener, listenerOptions);
-}
-
-window.addEventListener('touchstart', touchListener, listenerOptions);
-
-export function isUserTouching() {
-  return userTouching;
-}
-
-export function isIOS() {
-  return iOS;
-}

app/soapbox/is_mobile.ts

@@ -0,0 +1,34 @@
+'use strict';
+
+import { supportsPassiveEvents } from 'detect-passive-events';
+
+/** Breakpoint at which the application is considered "mobile". */
+const LAYOUT_BREAKPOINT = 630;
+
+/** Check if the width is small enough to be considered "mobile". */
+export function isMobile(width: number) {
+  return width <= LAYOUT_BREAKPOINT;
+}
+
+/** Whether the device is iOS (best guess). */
+const iOS: boolean = /iPad|iPhone|iPod/.test(navigator.userAgent) && !(window as any).MSStream;
+
+let userTouching = false;
+const listenerOptions = supportsPassiveEvents ? { passive: true } as EventListenerOptions : false;
+
+function touchListener(): void {
+  userTouching = true;
+  window.removeEventListener('touchstart', touchListener, listenerOptions);
+}
+
+window.addEventListener('touchstart', touchListener, listenerOptions);
+
+/** Whether the user has touched the screen since the page loaded. */
+export function isUserTouching(): boolean {
+  return userTouching;
+}
+
+/** Whether the device is iOS (best guess). */
+export function isIOS(): boolean {
+  return iOS;
+}

app/soapbox/middleware/errors.js

@@ -1,20 +0,0 @@
-import { showAlertForError } from '../actions/alerts';
-
-const isFailType = type => type.endsWith('_FAIL');
-const isRememberFailType = type => type.endsWith('_REMEMBER_FAIL');
-
-const hasResponse = error => Boolean(error && error.response);
-
-const shouldShowError = ({ type, skipAlert, error }) => {
-  return !skipAlert && hasResponse(error) && isFailType(type) && !isRememberFailType(type);
-};
-
-export default function errorsMiddleware() {
-  return ({ dispatch }) => next => action => {
-    if (shouldShowError(action)) {
-      dispatch(showAlertForError(action.error));
-    }
-
-    return next(action);
-  };
-}

app/soapbox/middleware/errors.ts

@@ -0,0 +1,29 @@
+import { showAlertForError } from '../actions/alerts';
+
+import type { AnyAction } from 'redux';
+import type { ThunkMiddleware } from 'redux-thunk';
+
+/** Whether the action is considered a failure. */
+const isFailType = (type: string): boolean => type.endsWith('_FAIL');
+
+/** Whether the action is a failure to fetch from browser storage. */
+const isRememberFailType = (type: string): boolean => type.endsWith('_REMEMBER_FAIL');
+
+/** Whether the error contains an Axios response. */
+const hasResponse = (error: any): boolean => Boolean(error && error.response);
+
+/** Whether the error should be shown to the user. */
+const shouldShowError = ({ type, skipAlert, error }: AnyAction): boolean => {
+  return !skipAlert && hasResponse(error) && isFailType(type) && !isRememberFailType(type);
+};
+
+/** Middleware to display Redux errors to the user. */
+export default function errorsMiddleware(): ThunkMiddleware {
+  return ({ dispatch }) => next => action => {
+    if (shouldShowError(action)) {
+      dispatch(showAlertForError(action.error));
+    }
+
+    return next(action);
+  };
+}

app/soapbox/middleware/sounds.ts

@@ -1,6 +1,15 @@
 'use strict';
 
-const createAudio = sources => {
+import type { ThunkMiddleware } from 'redux-thunk';
+
+/** Soapbox audio clip. */
+type Sound = {
+  src: string,
+  type: string,
+}
+
+/** Produce HTML5 audio from sound data. */
+const createAudio = (sources: Sound[]): HTMLAudioElement => {
   const audio = new Audio();
   sources.forEach(({ type, src }) => {
     const source = document.createElement('source');
@@ -11,7 +20,8 @@ const createAudio = sources => {
   return audio;
 };
 
-const play = audio => {
+/** Play HTML5 sound. */
+const play = (audio: HTMLAudioElement): void => {
   if (!audio.paused) {
     audio.pause();
     if (typeof audio.fastSeek === 'function') {
@@ -24,8 +34,9 @@ const play = audio => {
   audio.play();
 };
 
-export default function soundsMiddleware() {
+/** Middleware to play sounds in response to certain Redux actions. */
-  const soundCache = {
+export default function soundsMiddleware(): ThunkMiddleware {
+  const soundCache: Record<string, HTMLAudioElement> = {
     boop: createAudio([
       {
         src: require('../../sounds/boop.ogg'),
@@ -49,7 +60,7 @@ export default function soundsMiddleware() {
   };
 
   return () => next => action => {
-    if (action.meta && action.meta.sound && soundCache[action.meta.sound]) {
+    if (action.meta?.sound && soundCache[action.meta.sound]) {
       play(soundCache[action.meta.sound]);
     }
 

app/soapbox/precheck.ts

@@ -3,9 +3,14 @@
  * @module soapbox/precheck
  */
 
+/** Whether a page title was inserted with SSR. */
 const hasTitle = Boolean(document.querySelector('title'));
 
+/** Whether pre-rendered data exists in Mastodon's format. */
 const hasPrerenderPleroma  = Boolean(document.getElementById('initial-results'));
+
+/** Whether pre-rendered data exists in Pleroma's format. */
 const hasPrerenderMastodon = Boolean(document.getElementById('initial-state'));
 
+/** Whether initial data was loaded into the page by server-side-rendering (SSR). */
 export const isPrerendered = hasTitle || hasPrerenderPleroma || hasPrerenderMastodon;

app/soapbox/reducers/meta.ts

@@ -4,11 +4,13 @@ import { Record as ImmutableRecord } from 'immutable';
 
 import { INSTANCE_FETCH_FAIL } from 'soapbox/actions/instance';
 
+import type { AnyAction } from 'redux';
+
 const ReducerRecord = ImmutableRecord({
   instance_fetch_failed: false,
 });
 
-export default function meta(state = ReducerRecord(), action) {
+export default function meta(state = ReducerRecord(), action: AnyAction) {
   switch(action.type) {
   case INSTANCE_FETCH_FAIL:
     return state.set('instance_fetch_failed', true);

app/soapbox/rtl.ts

@@ -14,7 +14,8 @@
 
 const rtlChars = /[\u0590-\u083F]|[\u08A0-\u08FF]|[\uFB1D-\uFDFF]|[\uFE70-\uFEFF]/mg;
 
-export function isRtl(text) {
+/** Check if text is right-to-left (eg Arabic). */
+export function isRtl(text: string): boolean {
   if (text.length === 0) {
     return false;
   }

app/soapbox/settings.ts

@@ -2,15 +2,17 @@
 
 export default class Settings {
 
-  constructor(keyBase = null) {
+  keyBase: string | null = null;
+
+  constructor(keyBase: string | null = null) {
     this.keyBase = keyBase;
   }
 
-  generateKey(id) {
+  generateKey(id: string) {
     return this.keyBase ? [this.keyBase, `id${id}`].join('.') : id;
   }
 
-  set(id, data) {
+  set(id: string, data: any) {
     const key = this.generateKey(id);
     try {
       const encodedData = JSON.stringify(data);
@@ -21,17 +23,17 @@ export default class Settings {
     }
   }
 
-  get(id) {
+  get(id: string) {
     const key = this.generateKey(id);
     try {
       const rawData = localStorage.getItem(key);
-      return JSON.parse(rawData);
+      return rawData ? JSON.parse(rawData) : null;
     } catch (e) {
       return null;
     }
   }
 
-  remove(id) {
+  remove(id: string) {
     const data = this.get(id);
     if (data) {
       const key = this.generateKey(id);
@@ -46,5 +48,8 @@ export default class Settings {
 
 }
 
+/** Remember push notification settings. */
 export const pushNotificationsSetting = new Settings('soapbox_push_notification_data');
+
+/** Remember hashtag usage. */
 export const tagHistory = new Settings('soapbox_tag_history');

app/soapbox/store.ts

@@ -17,6 +17,8 @@ export const store = createStore(
   ),
 );
 
+export type Store = typeof store;
+
 // Infer the `RootState` and `AppDispatch` types from the store itself
 // https://redux.js.org/usage/usage-with-typescript
 export type RootState = ReturnType<typeof store.getState>;

app/soapbox/utils/accounts.ts

@@ -16,10 +16,9 @@ export const getDomain = (account: Account): string => {
   return domain ? domain : getDomainFromURL(account);
 };
 
-export const getBaseURL = (account: ImmutableMap<string, any>): string => {
+export const getBaseURL = (account: Account): string => {
   try {
-    const url = account.get('url');
+    return new URL(account.url).origin;
-    return new URL(url).origin;
   } catch {
     return '';
   }

app/soapbox/utils/favicon_service.ts

@@ -1,14 +1,23 @@
 // Adapted from Pleroma FE
 // https://git.pleroma.social/pleroma/pleroma-fe/-/blob/ef5bbc4e5f84bb9e8da76a0440eea5d656d36977/src/services/favicon_service/favicon_service.js
 
+type Favicon = {
+  favcanvas: HTMLCanvasElement,
+  favimg: HTMLImageElement,
+  favcontext: CanvasRenderingContext2D | null,
+  favicon: HTMLLinkElement,
+};
+
+/** Service to draw and update a notifications dot on the favicon */
 const createFaviconService = () => {
-  const favicons = [];
+  const favicons: Favicon[] = [];
   const faviconWidth = 128;
   const faviconHeight = 128;
   const badgeRadius = 24;
 
-  const initFaviconService = () => {
+  /** Start the favicon service */
-    const nodes = document.querySelectorAll('link[rel="icon"]');
+  const initFaviconService = (): void => {
+    const nodes: NodeListOf<HTMLLinkElement> = document.querySelectorAll('link[rel="icon"]');
     nodes.forEach(favicon => {
       if (favicon) {
         const favcanvas = document.createElement('canvas');
@@ -23,9 +32,11 @@ const createFaviconService = () => {
     });
   };
 
-  const isImageLoaded = (img) => img.complete && img.naturalHeight !== 0;
+  /** Check if the image is loaded */
+  const isImageLoaded = (img: HTMLImageElement): boolean => img.complete && img.naturalHeight !== 0;
 
-  const clearFaviconBadge = () => {
+  /** Reset the favicon image to its initial state */
+  const clearFaviconBadge = (): void => {
     if (favicons.length === 0) return;
     favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {
       if (!favimg || !favcontext || !favicon) return;
@@ -37,7 +48,8 @@ const createFaviconService = () => {
     });
   };
 
-  const drawFaviconBadge = () => {
+  /** Replace the favicon image with one that has a notification dot */
+  const drawFaviconBadge = (): void => {
     if (favicons.length === 0) return;
     clearFaviconBadge();
     favicons.forEach(({ favimg, favcanvas, favcontext, favicon }) => {

app/soapbox/utils/greentext.ts

@@ -1,6 +1,6 @@
 import { processHtml } from './tiny_post_html_processor';
 
-export const addGreentext = html => {
+export const addGreentext = (html: string): string => {
   // Copied from Pleroma FE
   // https://git.pleroma.social/pleroma/pleroma-fe/-/blob/19475ba356c3fd6c54ca0306d3ae392358c212d1/src/components/status_content/status_content.js#L132
   return processHtml(html, (string) => {

app/soapbox/utils/html.ts

@@ -1,16 +1,20 @@
+/** Convert HTML to a plaintext representation, preserving whitespace. */
 // NB: This function can still return unsafe HTML
-export const unescapeHTML = (html) => {
+export const unescapeHTML = (html: string): string => {
   const wrapper = document.createElement('div');
   wrapper.innerHTML = html.replace(/<br\s*\/?>/g, '\n').replace(/<\/p><[^>]*>/g, '\n\n').replace(/<[^>]*>/g, '');
-  return wrapper.textContent;
+  return wrapper.textContent || '';
 };
 
-export const stripCompatibilityFeatures = html => {
+/** Remove compatibility markup for features Soapbox supports. */
+export const stripCompatibilityFeatures = (html: string): string => {
   const node = document.createElement('div');
   node.innerHTML = html;
 
   const selectors = [
+    // Quote posting
     '.quote-inline',
+    // Explicit mentions
     '.recipients-inline',
   ];
 

app/soapbox/utils/numbers.js

@@ -1,16 +0,0 @@
-import React from 'react';
-import { FormattedNumber } from 'react-intl';
-
-export const isNumber = number => typeof number === 'number' && !isNaN(number);
-
-export const shortNumberFormat = number => {
-  if (!isNumber(number)) return '•';
-
-  if (number < 1000) {
-    return <FormattedNumber value={number} />;
-  } else {
-    return <span><FormattedNumber value={number / 1000} maximumFractionDigits={1} />K</span>;
-  }
-};
-
-export const isIntegerId = id => new RegExp(/^-?[0-9]+$/g).test(id);

app/soapbox/utils/numbers.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+import { FormattedNumber } from 'react-intl';
+
+/** Check if a value is REALLY a number. */
+export const isNumber = (number: unknown): boolean => typeof number === 'number' && !isNaN(number);
+
+/** Display a number nicely for the UI, eg 1000 becomes 1K. */
+export const shortNumberFormat = (number: any): React.ReactNode => {
+  if (!isNumber(number)) return '•';
+
+  if (number < 1000) {
+    return <FormattedNumber value={number} />;
+  } else {
+    return <span><FormattedNumber value={number / 1000} maximumFractionDigits={1} />K</span>;
+  }
+};
+
+/** Check if an entity ID is an integer (eg not a FlakeId). */
+export const isIntegerId = (id: string): boolean => new RegExp(/^-?[0-9]+$/g).test(id);

app/soapbox/utils/quirks.js

@@ -1,17 +0,0 @@
-import { createSelector } from 'reselect';
-
-import { parseVersion, PLEROMA, MITRA } from './features';
-
-// For solving bugs between API implementations
-export const getQuirks = createSelector([
-  instance => parseVersion(instance.get('version')),
-], (v) => {
-  return {
-    invertedPagination: v.software === PLEROMA,
-    noApps: v.software === MITRA,
-    noOAuthForm: v.software === MITRA,
-  };
-});
-
-export const getNextLinkName = getState =>
-  getQuirks(getState().get('instance')).invertedPagination ? 'prev' : 'next';

app/soapbox/utils/quirks.ts

@@ -0,0 +1,38 @@
+/* eslint sort-keys: "error" */
+import { createSelector } from 'reselect';
+
+import { parseVersion, PLEROMA, MITRA } from './features';
+
+import type { RootState } from 'soapbox/store';
+import type { Instance } from 'soapbox/types/entities';
+
+/** For solving bugs between API implementations. */
+export const getQuirks = createSelector([
+  (instance: Instance) => parseVersion(instance.version),
+], (v) => {
+  return {
+    /**
+     * The `next` and `prev` Link headers are backwards for blocks and mutes.
+     * @see GET /api/v1/blocks
+     * @see GET /api/v1/mutes
+     */
+    invertedPagination: v.software === PLEROMA,
+
+    /**
+     * Apps are not supported by the API, and should not be created during login or registration.
+     * @see POST /api/v1/apps
+     * @see POST /oauth/token
+     */
+    noApps: v.software === MITRA,
+
+    /**
+     * There is no OAuth form available for login.
+     * @see GET /oauth/authorize
+     */
+    noOAuthForm: v.software === MITRA,
+  };
+});
+
+/** Shortcut for inverted pagination quirk. */
+export const getNextLinkName = (getState: () => RootState) =>
+  getQuirks(getState().instance).invertedPagination ? 'prev' : 'next';

app/soapbox/utils/resize_image.ts

@@ -1,14 +1,19 @@
 /* eslint-disable no-case-declarations */
 const DEFAULT_MAX_PIXELS = 1920 * 1080;
 
-const _browser_quirks = {};
+interface BrowserCanvasQuirks {
+  'image-orientation-automatic'?: boolean,
+  'canvas-read-unreliable'?: boolean,
+}
+
+const _browser_quirks: BrowserCanvasQuirks = {};
 
 // Some browsers will automatically draw images respecting their EXIF orientation
 // while others won't, and the safest way to detect that is to examine how it
 // is done on a known image.
 // See https://github.com/w3c/csswg-drafts/issues/4666
 // and https://github.com/blueimp/JavaScript-Load-Image/commit/1e4df707821a0afcc11ea0720ee403b8759f3881
-const dropOrientationIfNeeded = (orientation) => new Promise(resolve => {
+const dropOrientationIfNeeded = (orientation: number) => new Promise<number>(resolve => {
   switch (_browser_quirks['image-orientation-automatic']) {
   case true:
     resolve(1);
@@ -40,10 +45,12 @@ const dropOrientationIfNeeded = (orientation) => new Promise(resolve => {
   }
 });
 
-// Some browsers don't allow reading from a canvas and instead return all-white
+// /**
-// or randomized data. Use a pre-defined image to check if reading the canvas
+//  *Some browsers don't allow reading from a canvas and instead return all-white
-// works.
+//  * or randomized data. Use a pre-defined image to check if reading the canvas
-// const checkCanvasReliability = () => new Promise((resolve, reject) => {
+//  * works.
+//  */
+// const checkCanvasReliability = () => new Promise<void>((resolve, reject) => {
 //   switch(_browser_quirks['canvas-read-unreliable']) {
 //   case true:
 //     reject('Canvas reading unreliable');
@@ -61,9 +68,9 @@ const dropOrientationIfNeeded = (orientation) => new Promise(resolve => {
 //     img.onload = () => {
 //       const canvas  = document.createElement('canvas');
 //       const context = canvas.getContext('2d');
-//       context.drawImage(img, 0, 0, 2, 2);
+//       context?.drawImage(img, 0, 0, 2, 2);
-//       const imageData = context.getImageData(0, 0, 2, 2);
+//       const imageData = context?.getImageData(0, 0, 2, 2);
-//       if (imageData.data.every((x, i) => refData[i] === x)) {
+//       if (imageData?.data.every((x, i) => refData[i] === x)) {
 //         _browser_quirks['canvas-read-unreliable'] = false;
 //         resolve();
 //       } else {
@@ -79,7 +86,9 @@ const dropOrientationIfNeeded = (orientation) => new Promise(resolve => {
 //   }
 // });
 
-const getImageUrl = inputFile => new Promise((resolve, reject) => {
+/** Convert the file into a local blob URL. */
+const getImageUrl = (inputFile: File) => new Promise<string>((resolve, reject) => {
+  // @ts-ignore: This is a browser capabilities check.
   if (window.URL?.createObjectURL) {
     try {
       resolve(URL.createObjectURL(inputFile));
@@ -91,29 +100,32 @@ const getImageUrl = inputFile => new Promise((resolve, reject) => {
 
   const reader = new FileReader();
   reader.onerror = (...args) => reject(...args);
-  reader.onload  = ({ target }) => resolve(target.result);
+  reader.onload  = ({ target }) => resolve((target?.result || '') as string);
 
   reader.readAsDataURL(inputFile);
 });
 
-const loadImage = inputFile => new Promise((resolve, reject) => {
+/** Get an image element from a file. */
+const loadImage = (inputFile: File) => new Promise<HTMLImageElement>((resolve, reject) => {
   getImageUrl(inputFile).then(url => {
     const img = new Image();
 
-    img.onerror = (...args) => reject(...args);
+    img.onerror = (...args) => reject([...args]);
     img.onload  = () => resolve(img);
 
     img.src = url;
   }).catch(reject);
 });
 
-const getOrientation = (img, type = 'image/png') => new Promise(resolve => {
+/** Get the exif orientation for the image. */
+const getOrientation = (img: HTMLImageElement, type = 'image/png') => new Promise<number>(resolve => {
   if (!['image/jpeg', 'image/webp'].includes(type)) {
     resolve(1);
     return;
   }
 
   import(/* webpackChunkName: "features/compose" */'exif-js').then(({ default: EXIF }) => {
+    // @ts-ignore: The TypeScript definition is wrong.
     EXIF.getData(img, () => {
       const orientation = EXIF.getTag(img, 'Orientation');
       if (orientation !== 1) {
@@ -125,7 +137,22 @@ const getOrientation = (img, type = 'image/png') => new Promise(resolve => {
   }).catch(() => {});
 });
 
-const processImage = (img, { width, height, orientation, type = 'image/png', name = 'resized.png' }) => new Promise(resolve => {
+const processImage = (
+  img: HTMLImageElement,
+  {
+    width,
+    height,
+    orientation,
+    type = 'image/png',
+    name = 'resized.png',
+  } : {
+    width: number,
+    height: number,
+    orientation: number,
+    type?: string,
+    name?: string,
+  },
+) => new Promise<File>((resolve, reject) => {
   const canvas  = document.createElement('canvas');
 
   if (4 < orientation && orientation < 9) {
@@ -138,6 +165,11 @@ const processImage = (img, { width, height, orientation, type = 'image/png', nam
 
   const context = canvas.getContext('2d');
 
+  if (!context) {
+    reject(context);
+    return;
+  }
+
   switch (orientation) {
   case 2: context.transform(-1, 0, 0, 1, width, 0); break;
   case 3: context.transform(-1, 0, 0, -1, width, height); break;
@@ -151,11 +183,19 @@ const processImage = (img, { width, height, orientation, type = 'image/png', nam
   context.drawImage(img, 0, 0, width, height);
 
   canvas.toBlob((blob) => {
+    if (!blob) {
+      reject(blob);
+      return;
+    }
     resolve(new File([blob], name, { type, lastModified: new Date().getTime() }));
   }, type);
 });
 
-const resizeImage = (img, inputFile, maxPixels) => new Promise((resolve, reject) => {
+const resizeImage = (
+  img: HTMLImageElement,
+  inputFile: File,
+  maxPixels: number,
+) => new Promise<File>((resolve, reject) => {
   const { width, height } = img;
   const type = inputFile.type || 'image/png';
 
@@ -177,7 +217,8 @@ const resizeImage = (img, inputFile, maxPixels) => new Promise((resolve, reject)
     .catch(reject);
 });
 
-export default (inputFile, maxPixels = DEFAULT_MAX_PIXELS) => new Promise((resolve) => {
+/** Resize an image to the maximum number of pixels. */
+export default (inputFile: File, maxPixels = DEFAULT_MAX_PIXELS) => new Promise<File>((resolve) => {
   if (!inputFile.type.match(/image.*/) || inputFile.type === 'image/gif') {
     resolve(inputFile);
     return;

app/soapbox/utils/rich_content.ts

@@ -1,15 +1,15 @@
-// Returns `true` if the node contains only emojis, up to a limit
+/** Returns `true` if the node contains only emojis, up to a limit */
-export const onlyEmoji = (node, limit = 1, ignoreMentions = true) => {
+export const onlyEmoji = (node: HTMLElement, limit = 1, ignoreMentions = true): boolean => {
   if (!node) return false;
 
   try {
     // Remove mentions before checking content
     if (ignoreMentions) {
-      node = node.cloneNode(true);
+      node = node.cloneNode(true) as HTMLElement;
-      node.querySelectorAll('a.mention').forEach(m => m.parentNode.removeChild(m));
+      node.querySelectorAll('a.mention').forEach(m => m.parentNode?.removeChild(m));
     }
 
-    if (node.textContent.replace(new RegExp(' ', 'g'), '') !== '') return false;
+    if (node.textContent?.replace(new RegExp(' ', 'g'), '') !== '') return false;
     const emojis = Array.from(node.querySelectorAll('img.emojione'));
     if (emojis.length === 0) return false;
     if (emojis.length > limit) return false;

app/soapbox/utils/state.js

@@ -1,42 +0,0 @@
-/**
- * State: general Redux state utility functions.
- * @module soapbox/utils/state
- */
-
-import { getSoapboxConfig } from'soapbox/actions/soapbox';
-import { BACKEND_URL } from 'soapbox/build_config';
-import { isPrerendered } from 'soapbox/precheck';
-import { getBaseURL as getAccountBaseURL } from 'soapbox/utils/accounts';
-import { isURL } from 'soapbox/utils/auth';
-
-export const displayFqn = state => {
-  const soapbox = getSoapboxConfig(state);
-  return soapbox.get('displayFqn');
-};
-
-export const federationRestrictionsDisclosed = state => {
-  return state.hasIn(['instance', 'pleroma', 'metadata', 'federation', 'mrf_policies']);
-};
-
-/**
- * Determine whether Soapbox FE is running in standalone mode.
- * Standalone mode runs separately from any backend and can login anywhere.
- * @param {object} state
- * @returns {boolean}
- */
-export const isStandalone = state => {
-  const instanceFetchFailed = state.getIn(['meta', 'instance_fetch_failed'], false);
-  return isURL(BACKEND_URL) ? false : (!isPrerendered && instanceFetchFailed);
-};
-
-/**
- * Get the baseURL of the instance.
- * @param {object} state
- * @returns {string} url
- */
-export const getBaseURL = state => {
-  const me = state.get('me');
-  const account = state.getIn(['accounts', me]);
-
-  return isURL(BACKEND_URL) ? BACKEND_URL : getAccountBaseURL(account);
-};

app/soapbox/utils/state.ts

@@ -0,0 +1,44 @@
+/**
+ * State: general Redux state utility functions.
+ * @module soapbox/utils/state
+ */
+
+import { getSoapboxConfig } from'soapbox/actions/soapbox';
+import * as BuildConfig from 'soapbox/build_config';
+import { isPrerendered } from 'soapbox/precheck';
+import { isURL } from 'soapbox/utils/auth';
+
+import type { RootState } from 'soapbox/store';
+
+/** Whether to display the fqn instead of the acct. */
+export const displayFqn = (state: RootState): boolean => {
+  return getSoapboxConfig(state).displayFqn;
+};
+
+/** Whether the instance exposes instance blocks through the API. */
+export const federationRestrictionsDisclosed = (state: RootState): boolean => {
+  return state.instance.pleroma.hasIn(['metadata', 'federation', 'mrf_policies']);
+};
+
+/**
+ * Determine whether Soapbox FE is running in standalone mode.
+ * Standalone mode runs separately from any backend and can login anywhere.
+ */
+export const isStandalone = (state: RootState): boolean => {
+  const instanceFetchFailed = state.meta.instance_fetch_failed;
+  return isURL(BuildConfig.BACKEND_URL) ? false : (!isPrerendered && instanceFetchFailed);
+};
+
+const getHost = (url: any): string => {
+  try {
+    return new URL(url).origin;
+  } catch {
+    return '';
+  }
+};
+
+/** Get the baseURL of the instance. */
+export const getBaseURL = (state: RootState): string => {
+  const account = state.accounts.get(state.me);
+  return isURL(BuildConfig.BACKEND_URL) ? BuildConfig.BACKEND_URL : getHost(account?.url);
+};

app/soapbox/utils/static.js

@@ -1,12 +0,0 @@
-/**
- * Static: functions related to static files.
- * @module soapbox/utils/static
- */
-
-import { join } from 'path';
-
-import { FE_SUBDIRECTORY } from 'soapbox/build_config';
-
-export const joinPublicPath = (...paths) => {
-  return join(FE_SUBDIRECTORY, ...paths);
-};

app/soapbox/utils/static.ts

@@ -0,0 +1,13 @@
+/**
+ * Static: functions related to static files.
+ * @module soapbox/utils/static
+ */
+
+import { join } from 'path';
+
+import * as BuildConfig from 'soapbox/build_config';
+
+/** Gets the path to a file with build configuration being considered. */
+export const joinPublicPath = (...paths: string[]): string => {
+  return join(BuildConfig.FE_SUBDIRECTORY, ...paths);
+};

app/soapbox/utils/status.ts

@@ -2,7 +2,8 @@ import { isIntegerId } from 'soapbox/utils/numbers';
 
 import type { Status as StatusEntity } from 'soapbox/types/entities';
 
-export const getFirstExternalLink = (status: StatusEntity) => {
+/** Grab the first external link from a status. */
+export const getFirstExternalLink = (status: StatusEntity): HTMLAnchorElement | null => {
   try {
     // Pulled from Pleroma's media parser
     const selector = 'a:not(.mention,.hashtag,.attachment,[rel~="tag"])';
@@ -14,11 +15,13 @@ export const getFirstExternalLink = (status: StatusEntity) => {
   }
 };
 
-export const shouldHaveCard = (status: StatusEntity) => {
+/** Whether the status is expected to have a Card after it loads. */
+export const shouldHaveCard = (status: StatusEntity): boolean => {
   return Boolean(getFirstExternalLink(status));
 };
 
+/** Whether the media IDs on this status have integer IDs (opposed to FlakeIds). */
 // https://gitlab.com/soapbox-pub/soapbox-fe/-/merge_requests/1087
-export const hasIntegerMediaIds = (status: StatusEntity) => {
+export const hasIntegerMediaIds = (status: StatusEntity): boolean => {
   return status.media_attachments.some(({ id }) => isIntegerId(id));
 };

app/soapbox/utils/tiny_post_html_processor.ts

@@ -1,32 +1,30 @@
 // Copied from Pleroma FE
 // https://git.pleroma.social/pleroma/pleroma-fe/-/blob/develop/src/services/tiny_post_html_processor/tiny_post_html_processor.service.js
 
+type Processor = (html: string) => string;
+
 /**
  * This is a tiny purpose-built HTML parser/processor. This basically detects any type of visual newline and
- * allows it to be processed, useful for greentexting, mostly
+ * allows it to be processed, useful for greentexting, mostly.
  *
- * known issue: doesn't handle CDATA so nested CDATA might not work well
+ * known issue: doesn't handle CDATA so nested CDATA might not work well.
- *
- * @param {Object} input - input data
- * @param {(string) => string} processor - function that will be called on every line
- * @return {string} processed html
  */
-export const processHtml = (html, processor) => {
+export const processHtml = (html: string, processor: Processor): string => {
   const handledTags = new Set(['p', 'br', 'div']);
   const openCloseTags = new Set(['p', 'div']);
 
   let buffer = ''; // Current output buffer
-  const level = []; // How deep we are in tags and which tags were there
+  const level: string[] = []; // How deep we are in tags and which tags were there
   let textBuffer = ''; // Current line content
   let tagBuffer = null; // Current tag buffer, if null = we are not currently reading a tag
 
   // Extracts tag name from tag, i.e. <span a="b"> => span
-  const getTagName = (tag) => {
+  const getTagName = (tag: string): string | null => {
     const result = /(?:<\/(\w+)>|<(\w+)\s?[^/]*?\/?>)/gi.exec(tag);
     return result && (result[1] || result[2]);
   };
 
-  const flush = () => { // Processes current line buffer, adds it to output buffer and clears line buffer
+  const flush = (): void => { // Processes current line buffer, adds it to output buffer and clears line buffer
     if (textBuffer.trim().length > 0) {
       buffer += processor(textBuffer);
     } else {
@@ -35,18 +33,18 @@ export const processHtml = (html, processor) => {
     textBuffer = '';
   };
 
-  const handleBr = (tag) => { // handles single newlines/linebreaks/selfclosing
+  const handleBr = (tag: string): void => { // handles single newlines/linebreaks/selfclosing
     flush();
     buffer += tag;
   };
 
-  const handleOpen = (tag) => { // handles opening tags
+  const handleOpen = (tag: string): void => { // handles opening tags
     flush();
     buffer += tag;
     level.push(tag);
   };
 
-  const handleClose = (tag) => { // handles closing tags
+  const handleClose = (tag: string): void => { // handles closing tags
     flush();
     buffer += tag;
     if (level[level.length - 1] === tag) {
@@ -65,7 +63,7 @@ export const processHtml = (html, processor) => {
       const tagFull = tagBuffer;
       tagBuffer = null;
       const tagName = getTagName(tagFull);
-      if (handledTags.has(tagName)) {
+      if (tagName && handledTags.has(tagName)) {
         if (tagName === 'br') {
           handleBr(tagFull);
         } else if (openCloseTags.has(tagName)) {

package.json

@@ -74,6 +74,8 @@
     "@types/http-link-header": "^1.0.3",
     "@types/jest": "^27.4.1",
     "@types/lodash": "^4.14.180",
+    "@types/object-assign": "^4.0.30",
+    "@types/object-fit-images": "^3.2.3",
     "@types/qrcode.react": "^1.0.2",
     "@types/react-datepicker": "^4.4.0",
     "@types/react-helmet": "^6.1.5",

yarn.lock

@@ -2144,6 +2144,16 @@
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.1.tgz#d3357479a0fdfdd5907fe67e17e0a85c906e1301"
   integrity sha512-Gj7cI7z+98M282Tqmp2K5EIsoouUEzbBJhQQzDE3jSIRk6r9gsz0oUokqIUR4u1R3dMHo0pDHM7sNOHyhulypw==
 
+"@types/object-assign@^4.0.30":
+  version "4.0.30"
+  resolved "https://registry.yarnpkg.com/@types/object-assign/-/object-assign-4.0.30.tgz#8949371d5a99f4381ee0f1df0a9b7a187e07e652"
+  integrity sha1-iUk3HVqZ9Dge4PHfCpt6GH4H5lI=
+
+"@types/object-fit-images@^3.2.3":
+  version "3.2.3"
+  resolved "https://registry.yarnpkg.com/@types/object-fit-images/-/object-fit-images-3.2.3.tgz#aa17a1cb4ac113ba81ce62f901177c9ccd5194f5"
+  integrity sha512-kpBPy4HIzbM1o3v+DJrK4V5NgUpcUg/ayzjixOVHQNukpdEUYDIaeDrnYJUSemQXWX5mKeEnxDRU1nACAWYnvg==
+
 "@types/parse-json@^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/@types/parse-json/-/parse-json-4.0.0.tgz#2f8bb441434d163b35fb8ffdccd7138927ffb8c0"