fix: don't overwrite the user's config

Author: aminya

src/typescript.js

@@ -7,7 +7,12 @@ export function setupTypeScript() {
   // activate atom-typescript
   atom.commands.dispatch(atom.workspace.getElement(), "typescript:activate")
   // support flow in JavaScript files
-  atom.config.set("atom-typescript.ignoredDiagnosticCodes", ["8002", "8003", "8004", "8006", "8008", "8010"])
+  const ignoredDiagnosticCodes = Array.from(
+    new Set(
+      atom.config.get("atom-typescript.ignoredDiagnosticCodes").concat(["8002", "8003", "8004", "8006", "8008", "8010"])
+    )
+  )
+  atom.config.set("atom-typescript.ignoredDiagnosticCodes", ignoredDiagnosticCodes)
 }
 
 /*