feat: Initial clean release of CHM

packages/app-mobile/contentScripts/utils/polyfills.ts

@@ -0,0 +1,27 @@
+// .replaceChildren is not supported in Chromium 83, which is the default for Android 11
+// (unless auto-updated from the Google Play store).
+HTMLElement.prototype.replaceChildren ??= function(this: HTMLElement, ...nodes: Node[]) {
+	while (this.children.length) {
+		this.children[0].remove();
+	}
+
+	for (const node of nodes) {
+		this.appendChild(node);
+	}
+};
+
+
+Array.prototype.flat ??= function<A, D extends number = 1>(this: A, depthParam?: D): FlatArray<A, D>[] {
+	if (!Array.isArray(this)) throw new Error('Not an array');
+	const depth = depthParam ?? 1;
+
+	const result = [] as FlatArray<A, D>[];
+	for (let i = 0; i < this.length; i++) {
+		if (Array.isArray(this[i]) && depth > 0) {
+			result.push(...this[i].flat(depth - 1));
+		} else {
+			result.push(this[i]);
+		}
+	}
+	return result;
+};

packages/app-mobile/contentScripts/utils/readFileToBase64.ts

@@ -0,0 +1,15 @@
+const readFileToBase64 = (file: Blob) => {
+	const reader = new FileReader();
+	return new Promise<string>((resolve, reject) => {
+		reader.onload = async () => {
+			const dataUrl = reader.result as string;
+			const base64 = dataUrl.replace(/^data:.*;base64,/, '');
+			resolve(base64);
+		};
+		reader.onerror = () => reject(new Error('Failed to load file.'));
+
+		reader.readAsDataURL(file);
+	});
+};
+
+export default readFileToBase64;

packages/app-mobile/contentScripts/utils/setUpLogger.ts

@@ -0,0 +1,14 @@
+import Logger, { TargetType } from '@joplin/utils/Logger';
+
+let loggerCreated = false;
+const setUpLogger = () => {
+	if (!loggerCreated) {
+		const logger = new Logger();
+		logger.addTarget(TargetType.Console);
+		logger.setLevel(Logger.LEVEL_WARN);
+		Logger.initializeGlobalLogger(logger);
+		loggerCreated = true;
+	}
+};
+
+export default setUpLogger;