All: Use Lerna to manage monorepo

packages/lib/SyncTargetRegistry.js

@@ -0,0 +1,54 @@
+class SyncTargetRegistry {
+	static classById(syncTargetId) {
+		const info = SyncTargetRegistry.reg_[syncTargetId];
+		if (!info) throw new Error(`Invalid id: ${syncTargetId}`);
+		return info.classRef;
+	}
+
+	static addClass(SyncTargetClass) {
+		this.reg_[SyncTargetClass.id()] = {
+			id: SyncTargetClass.id(),
+			name: SyncTargetClass.targetName(),
+			label: SyncTargetClass.label(),
+			classRef: SyncTargetClass,
+			supportsConfigCheck: SyncTargetClass.supportsConfigCheck(),
+		};
+	}
+
+	static nameToId(name) {
+		for (const n in this.reg_) {
+			if (!this.reg_.hasOwnProperty(n)) continue;
+			if (this.reg_[n].name === name) return this.reg_[n].id;
+		}
+		throw new Error(`Name not found: ${name}`);
+	}
+
+	static idToMetadata(id) {
+		for (const n in this.reg_) {
+			if (!this.reg_.hasOwnProperty(n)) continue;
+			if (this.reg_[n].id === id) return this.reg_[n];
+		}
+		throw new Error(`ID not found: ${id}`);
+	}
+
+	static idToName(id) {
+		return this.idToMetadata(id).name;
+	}
+
+	static idAndLabelPlainObject(os) {
+		const output = {};
+		for (const n in this.reg_) {
+			if (!this.reg_.hasOwnProperty(n)) continue;
+			const info = this.reg_[n];
+			if (info.classRef.unsupportedPlatforms().indexOf(os) >= 0) {
+				continue;
+			}
+			output[n] = info.label;
+		}
+		return output;
+	}
+}
+
+SyncTargetRegistry.reg_ = {};
+
+module.exports = SyncTargetRegistry;