Merge pull request #7 from SmartThingsCommunity/get-check

fix: SmartApp SDK expects `get` to return undefined if no data yet

lib/file-context-store.d.ts

@@ -1,20 +1,21 @@
 export interface ContextObject {
-	installedAppId: string;
+	installedAppId: string
 	locationId: string
-	locale: string;
-	authToken: string;
-	refreshToken: string;
-	config: any;
-	state: any;
+	locale: string
+	authToken: string
+	refreshToken: string
+	config: any
+	state: any
 }
 
-export interface FileContextStore {
-	get(installedAppId: string): Promise<ContextObject>;
-	put(installedAppId: string, context: ContextObject): Promise<void>;
-	update(installedAppId: string, context: Partial<ContextObject>): Promise<void>;
-	delete(installedAppId: string): Promise<void>;
-	getItem(installedAppId: string, key: string): Promise<any>;
-	putItem(installedAppId: string, key: string, value: any): Promise<void>;
-	removeItem(installedAppId: string, key: string): Promise<void>;
-	removeAllItems(installedAppId: string): Promise<void>;
+export class FileContextStore {
+	constructor(directory = 'data')
+	get(installedAppId: string): Promise<ContextObject>
+	put(context: ContextObject): Promise<ContextObject>
+	update(installedAppId: string, context: Partial<ContextObject>): Promise<void>
+	delete(installedAppId: string): Promise<void>
+	getItem(installedAppId: string, key: string): Promise<any>
+	putItem(installedAppId: string, key: string, value: any): Promise<void>
+	removeItem(installedAppId: string, key: string): Promise<void>
+	removeAllItems(installedAppId: string): Promise<void>
 }

lib/file-context-store.js

@@ -25,8 +25,15 @@ module.exports = class FileContextStore {
 	 * @returns {Promise<ContextObject>}
 	 */
 	async get(installedAppId) {
-		const data = await fsp.readFile(this.filename(installedAppId), encoding)
-		return JSON.parse(data)
+		try {
+			const data = await fsp.readFile(this.filename(installedAppId), encoding)
+			return JSON.parse(data)
+		} catch (error) {
+			if (error.code === 'ENOENT') {
+				return undefined
+			}
+			throw error
+		}
 	}
 
 	/**