Fixed a bunch of Lint issues

Author: Brian Vaughn

.eslintignore

@@ -12,3 +12,10 @@ scripts/bench/benchmarks/**/*.js
 
 # React repository clone
 scripts/bench/remote-repo/
+
+packages/react-devtools-core/dist
+packages/react-devtools-extensions/chrome/build
+packages/react-devtools-extensions/firefox/build
+packages/react-devtools-extensions/shared/build
+packages/react-devtools-inline/dist
+packages/react-devtools-shell/dist

.gitignore

@@ -22,3 +22,14 @@ chrome-user-data
 .vscode
 *.swp
 *.swo
+
+packages/react-devtools-core/dist
+packages/react-devtools-extensions/chrome/build
+packages/react-devtools-extensions/chrome/*.crx
+packages/react-devtools-extensions/chrome/*.pem
+packages/react-devtools-extensions/firefox/build
+packages/react-devtools-extensions/firefox/*.xpi
+packages/react-devtools-extensions/firefox/*.pem
+packages/react-devtools-extensions/shared/build
+packages/react-devtools-inline/dist
+packages/react-devtools-shell/dist

.prettierignore

@@ -0,0 +1,6 @@
+packages/react-devtools-core/dist
+packages/react-devtools-extensions/chrome/build
+packages/react-devtools-extensions/firefox/build
+packages/react-devtools-extensions/shared/build
+packages/react-devtools-inline/dist
+packages/react-devtools-shell/dist

packages/react-devtools-core/src/backend.js

@@ -253,7 +253,7 @@ export function connectToDevTools(options: ?ConnectOptions) {
       }
     } catch (e) {
       console.error(
-        '[React DevTools] Failed to parse JSON: ' + String(event.data),
+        '[React DevTools] Failed to parse JSON: ' + (event.data: any),
       );
       return;
     }