diff --git a/effect/src/index.ts b/effect/src/index.ts
index aa96af82c06b7..2ad565fa5aa4a 100644
--- a/effect/src/index.ts
+++ b/effect/src/index.ts
@@ -2,12 +2,12 @@ import { Effect } from "./prelude.js";
 import { Maybe } from "./prelude.js";
 
 export const isPositive = (n: number) =>
-  n > 0 ? Maybe.just("positive") : Maybe.nothing()
+  n > 0 ? Maybe.just("positive") : Maybe.nothing();
 
 export const isPositiveEff = (n: number) =>
-  n > 0 ? Effect("positive") : Effect.fail("negative")
+  n > 0 ? Effect("positive") : Effect.fail("negative");
 
-export const resultEither = isPositive(0).match(() => "nope", () => "yeah")
+export const resultEither = isPositive(0).match(() => "nope", () => "yeah");
 
 export const prog = Effect.do
   .bind("a", () => Effect(0))
@@ -15,10 +15,10 @@ export const prog = Effect.do
   .bind("c", () => Effect(2))
   .bind("d", () => Effect(4) + Effect(5))
   .map(({ a, b, c, d: { tuple: [e, f] } }) => `result: ${a + b + c} ${e} ${f}`)
-  .flatMap((s) => Effect(console.log(s)))
+  .flatMap((s) => Effect(console.log(s)));
 
-export const result = prog | Effect.fail("error")
+export const result = prog | Effect.fail("error");
 
 prog.unsafeRunPromise()
 
-export const xxx = pipe(0, n => n + 1, n => `hello: ${n}`)
\ No newline at end of file
+export const xxx = pipe(0, n => n + 1, n => `hello: ${n}`)
diff --git a/src/services/goToDefinition.ts b/src/services/goToDefinition.ts
index a7fdff1a8db21..1635184a9c193 100644
--- a/src/services/goToDefinition.ts
+++ b/src/services/goToDefinition.ts
@@ -49,12 +49,28 @@ namespace ts.GoToDefinition {
                 const staticSymbol = typeChecker.getStaticExtension(type, name);
                 if(staticSymbol && !isCallExpression(parent.parent)) {
                     const declaration = staticSymbol.patched.valueDeclaration!;
+                    let start: number;
+                    let length: number;
+                    if(declaration.original && isNamedDeclaration(declaration.original)) {
+                        start = declaration.original.name.getStart();
+                        length = declaration.original.getWidth();
+                    }
+                    else if(isNamedDeclaration(declaration)) {
+                        start = declaration.name.getStart();
+                        length = declaration.getWidth();
+                    }
+                    else {
+                        start = declaration.getStart();
+                        length = declaration.getWidth();
+                    }
+
+                    if(start === -1 || length === -1) {
+                        return undefined;
+                    }
+
                     return [{
                         fileName: staticSymbol.definition.fileName,
-                        textSpan: {
-                            start: declaration.pos + 1,
-                            length: declaration.end - declaration.pos
-                        },
+                        textSpan: { start, length },
                         kind: SymbolDisplay.getSymbolKind(typeChecker, staticSymbol.patched, node),
                         name: typeChecker.symbolToString(staticSymbol.patched),
                         containerKind: undefined!,