support file system watchers (listeners)

src/actions/setupActions.ts

@@ -37,15 +37,33 @@ const runCommands = async (commands: string[], language: string = 'JAVASCRIPT')
 	}
 }
 
+// collect active file watchers (listeners)
+const watchers: {[key: string]: vscode.FileSystemWatcher} = {}
 
-const setupActions = async (workspaceRoot: vscode.WorkspaceFolder, {commands, commits, files}: G.StepActions): Promise<void> => {
+const setupActions = async (workspaceRoot: vscode.WorkspaceFolder, {commands, commits, files, listeners}: G.StepActions): Promise<void> => {
 	// run commits
 	if (commits) {
 		for (const commit of commits) {
 			await git.loadCommit(commit)
 		}
 	}
 
+	// run file watchers (listeners)
+	if (listeners) {
+		for (const listener of listeners) {
+			if (!watchers[listener]) {
+				watchers[listener] = vscode.workspace.createFileSystemWatcher(listener)
+				watchers[listener].onDidChange(() => {
+					// trigger save
+					vscode.commands.executeCommand('coderoad.run_test')
+					// cleanup watcher
+					watchers[listener].dispose()
+					delete watchers[listener]
+				})
+			}
+		}
+	}
+
 	// run command
 	if (commands) {
 		await runCommands(commands)

typings/graphql.d.ts

@@ -133,6 +133,7 @@ export type StepActions = {
 	commits: Array<Scalars['Sha1']>
 	files?: Maybe<Array<Scalars['String']>>
 	commands?: Maybe<Array<Scalars['String']>>
+	listeners?: Maybe<Array<Scalars['String']>>
 }
 
 export type TestRunner = 'JEST'
@@ -494,6 +495,7 @@ export type StepActionsResolvers<
 		commits?: Resolver<Array<ResolversTypes['Sha1']>, ParentType, ContextType>
 		files?: Resolver<Maybe<Array<ResolversTypes['String']>>, ParentType, ContextType>
 		commands?: Resolver<Maybe<Array<ResolversTypes['String']>>, ParentType, ContextType>
+		listeners?: Resolver<Maybe<Array<ResolversTypes['String']>>, ParentType, ContextType>
 	}
 
 export type TutorialResolvers<
@@ -632,9 +634,3 @@ export interface IntrospectionResultData {
 		}[]
 	}
 }
-const result: IntrospectionResultData = {
-	__schema: {
-		types: [],
-	},
-}
-export default result