Remove unnecessary backwards compat check

Author: nicolo-ribaudo

src/compiler/emitter.ts

@@ -3689,10 +3689,6 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
             emitTokenWithComment(node.phaseModifier, node.pos, writeKeyword, node);
             writeSpace();
         }
-        else if (node.isTypeOnly) {
-            emitTokenWithComment(SyntaxKind.TypeKeyword, node.pos, writeKeyword, node);
-            writeSpace();
-        }
         emit(node.name);
         if (node.name && node.namedBindings) {
             emitTokenWithComment(SyntaxKind.CommaToken, node.name.end, writePunctuation, node);

src/compiler/types.ts

@@ -3713,7 +3713,7 @@ export type NamedExportBindings =
 export interface ImportClause extends NamedDeclaration {
     readonly kind: SyntaxKind.ImportClause;
     readonly parent: ImportDeclaration | JSDocImportTag;
-    /** @deprecated */ readonly isTypeOnly: boolean | "hello";
+    /** @deprecated */ readonly isTypeOnly: boolean;
     readonly phaseModifier: undefined | ImportPhaseModifier;
     readonly name?: Identifier; // Default binding
     readonly namedBindings?: NamedImportBindings;

tests/baselines/reference/api/typescript.d.ts

@@ -5516,7 +5516,7 @@ declare namespace ts {
     interface ImportClause extends NamedDeclaration {
         readonly kind: SyntaxKind.ImportClause;
         readonly parent: ImportDeclaration | JSDocImportTag;
-        /** @deprecated */ readonly isTypeOnly: boolean | "hello";
+        /** @deprecated */ readonly isTypeOnly: boolean;
         readonly phaseModifier: undefined | ImportPhaseModifier;
         readonly name?: Identifier;
         readonly namedBindings?: NamedImportBindings;