Don't load Flow if a .flowconfig cannot be found

CHANGELOG.md

@@ -1,5 +1,7 @@
 ### Master
 
+
+* Do not start the extension if a .flowconfig cannot be found. - [@orta][] [#95](https://github.com/flowtype/flow-for-vscode/pull/95)
 * Adds the status indicator (spinner) to the statusbar which appears when flow is
   type checking, so that users can tell if everything type checked or if flow is
   just not finished yet. Indicator can be disabled by setting `flow.showStatus` to
@@ -20,11 +22,11 @@
 ### 0.5.0
 
 * Uses the absolute path to the `where` command provided by Windows - JPanneel #69
-* Uses the new VS Code autocompletion API for functions - orta #51
+* Uses the new VS Code autocompletion API for functions - [@orta][] #51
 * When you want to work on the flow-for-vscode project, pressing run will start the
-  babel build watcher task - orta
+  babel build watcher task - [@orta][]
 * Adds support for *.js.flow files ( such as those generated by graphql-js ) which are 
-  treated as common JavaScript files - orta
+  treated as common JavaScript files - [@orta][]
 * Fixes "File not found" error with diagnostics when `flow status --json` provides
   non-absolute file paths - ryanashcraft #77
 
@@ -33,7 +35,8 @@
 * Adds the ability to use flow from your project's node_modules folder. 
   This is a security risk ( see https://github.com/facebook/nuclide/issues/570) and so it
   is hidden behind a user setting of `useNPMPackagedFlow` which needs to be set to `true`
-  for it to work. - orta #53
-* Show flow errors that start at line 0 - orta #54 
+  for it to work. - [@orta][] #53
+* Show flow errors that start at line 0 - [@orta][] #54 
 
 [@gozala]:https://github.com/Gozala
+[@orta]:https://github.com/orta

lib/flowMain.js

@@ -20,7 +20,7 @@ import {DeclarationSupport} from './flowDeclaration';
 import {setupDiagnostics} from './flowDiagnostics';
 
 import {checkNode, checkFlow, isFlowEnabled} from './utils'
-import {clearWorkspaceCaches} from './pkg/flow-base/lib/FlowHelpers'
+import {clearWorkspaceCaches, findFlowConfigDir} from './pkg/flow-base/lib/FlowHelpers'
 
 import {setupLogging} from "./flowLogging"
 
@@ -29,27 +29,35 @@ const languages = [
 	'javascriptreact'
 ]
 
-export function activate(context:ExtensionContext): void {
+export function activate(context: ExtensionContext): void {
 	//User can disable flow for some projects that previously used flow, but it's not have actual typing
 	if (!isFlowEnabled()) {
 		return
 	}
-	global.vscode = vscode
 
-	setupLogging()
-	checkNode()
-	checkFlow()
+	findFlowConfigDir(vscode.workspace.rootPath).then(configPath => {
+		if (!configPath) {
+			console.log(`Not starting Flow: Could not find a .flowconfig after a backwards search from ${vscode.workspace.rootPath}.`)
+			return
+		}
 
-	// Language features
-	languages.forEach(lang => {
-		context.subscriptions.push(vscode.languages.registerHoverProvider(lang, new HoverSupport));
-		context.subscriptions.push(vscode.languages.registerDefinitionProvider(lang, new DeclarationSupport()));
-		context.subscriptions.push(vscode.languages.registerCompletionItemProvider(lang, new CompletionSupport(), '.'));
+		global.vscode = vscode
+
+		setupLogging()
+		checkNode()
+		checkFlow()
+
+		// Language features
+		languages.forEach(lang => {
+			context.subscriptions.push(vscode.languages.registerHoverProvider(lang, new HoverSupport));
+			context.subscriptions.push(vscode.languages.registerDefinitionProvider(lang, new DeclarationSupport()));
+			context.subscriptions.push(vscode.languages.registerCompletionItemProvider(lang, new CompletionSupport(), '.'));
+		})
+		// https://github.com/Microsoft/vscode/issues/7031 Workaround for language scoring for language and in-memory. Check in nearest Insiders build
+		// context.subscriptions.push(vscode.languages.registerCompletionItemProvider({ language: 'javascript' }, new CompletionSupport(), '.'));
+		// Diagnostics
+		setupDiagnostics(context);
 	})
-	// https://github.com/Microsoft/vscode/issues/7031 Workaround for language scoring for language and in-memory. Check in nearest Insiders build
-	// context.subscriptions.push(vscode.languages.registerCompletionItemProvider({ language: 'javascript' }, new CompletionSupport(), '.'));
-	// Diagnostics
-	setupDiagnostics(context);
 }
 
 vscode.workspace.onDidChangeConfiguration(params => {