refactor(frontend): frontend-embed/src/to-be-sharedを共通化 (#14536)

* refactor(frontend): shouldCollapsedを共通化

* refactor(frontend): config.js, worker-multi-dispatch.js, intl-const.jsを共通化

* fix(frontend-shared): fix type error

* refactor(frontend): is-link.jsと、同一の振る舞いをする記述を共通化

* fix

* fix lint

* lint fixes

9 files changed, 238 insertions, 3 deletions

diff --git a/packages/frontend-shared/@types/global.d.ts b/packages/frontend-shared/@types/global.d.ts
new file mode 100644
index 0000000000..4b8d679e75
--- /dev/null
+++ b/packages/frontend-shared/@types/global.d.ts
@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type FIXME = any;
+
+declare const _LANGS_: string[][];
+declare const _VERSION_: string;
+declare const _ENV_: string;
+declare const _DEV_: boolean;
+declare const _PERF_PREFIX_: string;
+declare const _DATA_TRANSFER_DRIVE_FILE_: string;
+declare const _DATA_TRANSFER_DRIVE_FOLDER_: string;
+declare const _DATA_TRANSFER_DECK_COLUMN_: string;
+
+// for dev-mode
+declare const _LANGS_FULL_: string[][];
+
+// TagCanvas
+interface Window {
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	TagCanvas: any;
+}
diff --git a/packages/frontend-shared/eslint.config.js b/packages/frontend-shared/eslint.config.js
index a15fb29e37..cd4641a270 100644
--- a/packages/frontend-shared/eslint.config.js
+++ b/packages/frontend-shared/eslint.config.js
@@ -14,7 +14,11 @@ export default [
 	},
 	...pluginVue.configs['flat/recommended'],
 	{
-		files: ['js/**/*.{ts,vue}', '**/*.vue'],
+		files: [
+			'@types/**/*.ts',
+			'js/**/*.ts',
+			'**/*.vue',
+		],
 		languageOptions: {
 			globals: {
 				...Object.fromEntries(Object.entries(globals.node).map(([key]) => [key, 'off'])),
diff --git a/packages/frontend-shared/js/collapsed.ts b/packages/frontend-shared/js/collapsed.ts
new file mode 100644
index 0000000000..af1f88cb73
--- /dev/null
+++ b/packages/frontend-shared/js/collapsed.ts
@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as Misskey from 'misskey-js';
+
+export function shouldCollapsed(note: Misskey.entities.Note, urls: string[]): boolean {
+	const collapsed = note.cw == null && (
+		(note.text != null && (
+			(note.text.includes('$[x2')) ||
+			(note.text.includes('$[x3')) ||
+			(note.text.includes('$[x4')) ||
+			(note.text.includes('$[scale')) ||
+			(note.text.split('\n').length > 9) ||
+			(note.text.length > 500) ||
+			(urls.length >= 4)
+		)) || (note.files != null && note.files.length >= 5)
+	);
+
+	return collapsed;
+}
diff --git a/packages/frontend-shared/js/config.ts b/packages/frontend-shared/js/config.ts
new file mode 100644
index 0000000000..ae1dcae10b
--- /dev/null
+++ b/packages/frontend-shared/js/config.ts
@@ -0,0 +1,28 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { Locale } from '../../../locales/index.js';
+
+// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
+const address = new URL(document.querySelector<HTMLMetaElement>('meta[property="instance_url"]')?.content || location.href);
+const siteName = document.querySelector<HTMLMetaElement>('meta[property="og:site_name"]')?.content;
+
+export const host = address.host;
+export const hostname = address.hostname;
+export const url = address.origin;
+export const apiUrl = location.origin + '/api';
+export const wsOrigin = location.origin;
+export const lang = localStorage.getItem('lang') ?? 'en-US';
+export const langs = _LANGS_;
+const preParseLocale = localStorage.getItem('locale');
+export let locale: Locale = preParseLocale ? JSON.parse(preParseLocale) : null;
+export const version = _VERSION_;
+export const instanceName = (siteName === 'Misskey' || siteName == null) ? host : siteName;
+export const ui = localStorage.getItem('ui');
+export const debug = localStorage.getItem('debug') === 'true';
+
+export function updateLocale(newLocale: Locale): void {
+	locale = newLocale;
+}
diff --git a/packages/frontend-shared/js/emoji-base.ts b/packages/frontend-shared/js/emoji-base.ts
index a01540a3e4..5fbbc4ea84 100644
--- a/packages/frontend-shared/js/emoji-base.ts
+++ b/packages/frontend-shared/js/emoji-base.ts
@@ -19,7 +19,7 @@ export function char2fluentEmojiFilePath(char: string): string {
 	// Fluent Emojiは国旗非対応 https://github.com/microsoft/fluentui-emoji/issues/25
 	if (codes[0]?.startsWith('1f1')) return char2twemojiFilePath(char);
 	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
-	codes = codes.filter(x => x && x.length);
-	const fileName = codes.map(x => x!.padStart(4, '0')).join('-');
+	codes = codes.filter(x => x != null && x.length > 0);
+	const fileName = (codes as string[]).map(x => x.padStart(4, '0')).join('-');
 	return `${fluentEmojiPngBase}/${fileName}.png`;
 }
diff --git a/packages/frontend-shared/js/intl-const.ts b/packages/frontend-shared/js/intl-const.ts
new file mode 100644
index 0000000000..33b65b6e9b
--- /dev/null
+++ b/packages/frontend-shared/js/intl-const.ts
@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { lang } from '@@/js/config.js';
+
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+export const versatileLang = (lang ?? 'ja-JP').replace('ja-KS', 'ja-JP');
+
+let _dateTimeFormat: Intl.DateTimeFormat;
+try {
+	_dateTimeFormat = new Intl.DateTimeFormat(versatileLang, {
+		year: 'numeric',
+		month: 'numeric',
+		day: 'numeric',
+		hour: 'numeric',
+		minute: 'numeric',
+		second: 'numeric',
+	});
+} catch (err) {
+	console.warn(err);
+	if (_DEV_) console.log('[Intl] Fallback to en-US');
+
+	// Fallback to en-US
+	_dateTimeFormat = new Intl.DateTimeFormat('en-US', {
+		year: 'numeric',
+		month: 'numeric',
+		day: 'numeric',
+		hour: 'numeric',
+		minute: 'numeric',
+		second: 'numeric',
+	});
+}
+export const dateTimeFormat = _dateTimeFormat;
+
+export const timeZone = dateTimeFormat.resolvedOptions().timeZone;
+
+export const hemisphere = /^(australia|pacific|antarctica|indian)\//i.test(timeZone) ? 'S' : 'N';
+
+let _numberFormat: Intl.NumberFormat;
+try {
+	_numberFormat = new Intl.NumberFormat(versatileLang);
+} catch (err) {
+	console.warn(err);
+	if (_DEV_) console.log('[Intl] Fallback to en-US');
+
+	// Fallback to en-US
+	_numberFormat = new Intl.NumberFormat('en-US');
+}
+export const numberFormat = _numberFormat;
diff --git a/packages/frontend-shared/js/is-link.ts b/packages/frontend-shared/js/is-link.ts
new file mode 100644
index 0000000000..946f86400e
--- /dev/null
+++ b/packages/frontend-shared/js/is-link.ts
@@ -0,0 +1,12 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export function isLink(el: HTMLElement) {
+	if (el.tagName === 'A') return true;
+	if (el.parentElement) {
+		return isLink(el.parentElement);
+	}
+	return false;
+}
diff --git a/packages/frontend-shared/js/worker-multi-dispatch.ts b/packages/frontend-shared/js/worker-multi-dispatch.ts
new file mode 100644
index 0000000000..5d393ed1ed
--- /dev/null
+++ b/packages/frontend-shared/js/worker-multi-dispatch.ts
@@ -0,0 +1,86 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+function defaultUseWorkerNumber(prev: number) {
+	return prev + 1;
+}
+
+type WorkerNumberGetter = (prev: number, totalWorkers: number) => number;
+
+export class WorkerMultiDispatch<POST = unknown, RETURN = unknown> {
+	private symbol = Symbol('WorkerMultiDispatch');
+	private workers: Worker[] = [];
+	private terminated = false;
+	private prevWorkerNumber = 0;
+	private getUseWorkerNumber: WorkerNumberGetter;
+	private finalizationRegistry: FinalizationRegistry<symbol>;
+
+	constructor(workerConstructor: () => Worker, concurrency: number, getUseWorkerNumber = defaultUseWorkerNumber) {
+		this.getUseWorkerNumber = getUseWorkerNumber;
+		for (let i = 0; i < concurrency; i++) {
+			this.workers.push(workerConstructor());
+		}
+
+		this.finalizationRegistry = new FinalizationRegistry(() => {
+			this.terminate();
+		});
+		this.finalizationRegistry.register(this, this.symbol);
+
+		if (_DEV_) console.log('WorkerMultiDispatch: Created', this);
+	}
+
+	public postMessage(message: POST, options?: Transferable[] | StructuredSerializeOptions, useWorkerNumber: WorkerNumberGetter = this.getUseWorkerNumber) {
+		let workerNumber = useWorkerNumber(this.prevWorkerNumber, this.workers.length);
+		workerNumber = Math.abs(Math.round(workerNumber)) % this.workers.length;
+		if (_DEV_) console.log('WorkerMultiDispatch: Posting message to worker', workerNumber, useWorkerNumber);
+		this.prevWorkerNumber = workerNumber;
+
+		// 不毛だがunionをoverloadに突っ込めない
+		// https://stackoverflow.com/questions/66507585/overload-signatures-union-types-and-no-overload-matches-this-call-error
+		// https://github.com/microsoft/TypeScript/issues/14107
+		if (Array.isArray(options)) {
+			this.workers[workerNumber].postMessage(message, options);
+		} else {
+			this.workers[workerNumber].postMessage(message, options);
+		}
+		return workerNumber;
+	}
+
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	public addListener(callback: (this: Worker, ev: MessageEvent<RETURN>) => any, options?: boolean | AddEventListenerOptions) {
+		this.workers.forEach(worker => {
+			worker.addEventListener('message', callback, options);
+		});
+	}
+
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	public removeListener(callback: (this: Worker, ev: MessageEvent<RETURN>) => any, options?: boolean | AddEventListenerOptions) {
+		this.workers.forEach(worker => {
+			worker.removeEventListener('message', callback, options);
+		});
+	}
+
+	public terminate() {
+		this.terminated = true;
+		if (_DEV_) console.log('WorkerMultiDispatch: Terminating', this);
+		this.workers.forEach(worker => {
+			worker.terminate();
+		});
+		this.workers = [];
+		this.finalizationRegistry.unregister(this);
+	}
+
+	public isTerminated() {
+		return this.terminated;
+	}
+
+	public getWorkers() {
+		return this.workers;
+	}
+
+	public getSymbol() {
+		return this.symbol;
+	}
+}
diff --git a/packages/frontend-shared/tsconfig.json b/packages/frontend-shared/tsconfig.json
index fa0b765534..09a8ff76aa 100644
--- a/packages/frontend-shared/tsconfig.json
+++ b/packages/frontend-shared/tsconfig.json
@@ -16,7 +16,13 @@
 		"experimentalDecorators": true,
 		"noImplicitReturns": true,
 		"esModuleInterop": true,
+		"baseUrl": ".",
+		"paths": {
+			"@/*": ["./*"],
+			"@@/*": ["./*"]
+		},
 		"typeRoots": [
+			"./@types",
 			"./node_modules/@types"
 		],
 		"lib": [
@@ -25,6 +31,7 @@
 		]
 	},
 	"include": [
+		"@types/**/*.ts",
 		"js/**/*"
 	],
 	"exclude": [