Split the module up into multiple files

src/migration.js

@@ -0,0 +1,57 @@
+import {settingsKey} from "./settings.js"
+
+const currentDataVersion = "1.1.0"
+
+export function performMigrations() {
+	if (!game.user.isGM)
+		return
+
+	let dataVersion = game.settings.get(settingsKey, "dataVersion")
+	if (dataVersion === "fresh install")
+	{
+		game.settings.set(settingsKey, "dataVersion", currentDataVersion);
+		return;
+	}
+
+	if (dataVersion === "1.0.0") {
+		dataVersion = "1.1.0"
+		ui.notifications.info(game.i18n.format("smart-doors.ui.messages.migrating", {version: dataVersion}))
+
+		// Make a dictionary that maps all door ids to their scenes
+		const walls = game.scenes.reduce((dict, scene) => {
+			scene.data.walls.forEach(wall => {
+				if (!wall.door)
+					return
+				dict[wall._id] = scene.id
+			})
+			return dict
+		}, {})
+
+		// Migrate all messages that have a (wall) source id
+		game.messages.forEach(async message => {
+			const wallId = message.data.flags.smartdoors?.sourceId
+			if (!wallId)
+				return
+			const flags = message.data.flags
+			delete flags.smartdoors.sourceId
+			const scene = walls[wallId]
+			// If there is no wall with this id anymore we can drop the value. It has no purpose anymore
+			if (!scene) {
+				if (!message.data.flags.smartdoors)
+					delete flags.smartdoors
+			}
+			else {
+				// Assign the id and the scene id to the new data structure
+				flags.smartdoors.source = {wall: wallId, scene: scene}
+			}
+
+			// We have to disable recursive here so deleting keys will actually work
+			message.update({flags: flags}, {diff: false, recursive: false})
+		})
+
+		game.settings.set(settingsKey, "dataVersion", dataVersion)
+		ui.notifications.info(game.i18n.format("smart-doors.ui.messages.migrationDone", {version: dataVersion}))
+	}
+	if (dataVersion != currentDataVersion)
+		ui.notifications.error(game.i18n.format("smart-doors.ui.messages.unknownVersion", {version: dataVersion}), {permanent: true})
+}