(fix) duplicate file extension on json import (#1029)

Author: jasonlyu123

packages/language-server/src/plugins/typescript/features/CompletionProvider.ts

@@ -304,9 +304,11 @@ export class CompletionsProviderImpl implements CompletionsProvider<CompletionEn
         }
 
         if (isScriptElement && hasModifier) {
+            const label =
+                kindModifiers && !name.endsWith(kindModifiers) ? name + kindModifiers : name;
             return {
                 insertText: name,
-                label: name + kindModifiers,
+                label,
                 isSvelteComp
             };
         }

packages/language-server/test/plugins/typescript/testfiles/completions/toImport.json

@@ -0,0 +1 @@
+{}

packages/language-server/test/plugins/typescript/testfiles/tsconfig.json

@@ -5,7 +5,9 @@
           This is actually not needed, but makes the tests faster
           because TS does not look up other types.
         */
-        "types": ["svelte"]
+        "types": ["svelte"],
+        /**For testing import json file*/
+        "resolveJsonModule": true
     },
     "exclude": [
         /**For testing exclude */