Don't change name of interface/class

src/generate-output.ts

@@ -1,7 +1,7 @@
 import * as ts from 'typescript';
 
 import { packageVersion } from './helpers/package-version';
-import { getModifiers, getNodeName, modifiersToMap, recreateRootLevelNodeWithModifiers } from './helpers/typescript';
+import { getClosestModuleLikeNode, getModifiers, getNodeName, isAmbientModule, modifiersToMap, recreateRootLevelNodeWithModifiers } from './helpers/typescript';
 
 export interface ModuleImportsSet {
 	defaultImports: Set<string>;
@@ -231,6 +231,16 @@ function getStatementText(statement: ts.Statement, includeSortingValue: boolean,
 							return node;
 						}
 
+						if (ts.isIdentifier(node) && (node.parent as ts.NamedDeclaration).name === node && (
+							ts.isInterfaceDeclaration(node.parent) ||
+							ts.isClassDeclaration(node.parent)
+						)) {
+							const moduleNode = getClosestModuleLikeNode(node);
+							if (isAmbientModule(moduleNode)) {
+								return node;
+							}
+						}
+
 						return recreateEntityName(node, helpers);
 					}
 				}

tests/e2e/test-cases/names-collision-with-globals/config.ts

@@ -1,6 +1,10 @@
 import { TestCaseConfig } from '../test-case-config';
 
 const config: TestCaseConfig = {
+    output: {
+        inlineDeclareExternals: true,
+        inlineDeclareGlobals: true
+    }
 };
 
 export = config;

tests/e2e/test-cases/names-collision-with-globals/input.ts

@@ -1,4 +1,5 @@
 import { Date as LocalDate, Promise as LocalPromise } from './local-types';
+import { BaseEncodingOptions as Alias1, BigIntOptions as Alias2 } from 'node:fs';
 
 export interface Int {
 	localD: LocalDate;
@@ -7,3 +8,25 @@ export interface Int {
 	localP: LocalPromise;
 	globalP: Promise<number>;
 }
+
+export interface Interface1 extends Alias1 {}
+export interface Interface2 extends Alias2 {}
+
+declare module 'node:fs' {
+    interface BaseEncodingOptions {
+        newField: string;
+    }
+
+	class BigIntOptions {
+		newField: string;
+	}
+
+	interface Interface1 {}
+
+	interface Interface3 extends Interface2 {}
+}
+
+declare global {
+	interface Interface2 {}
+	interface Interface3 extends Interface1 {}
+}

tests/e2e/test-cases/names-collision-with-globals/local-types.ts

@@ -4,6 +4,8 @@ declare global {
 	type Promise$2 = string;
 
 	type Date$1 = string;
+
+	interface Interface1 {}
 }
 
 export interface Promise {}

tests/e2e/test-cases/names-collision-with-globals/output.d.ts

@@ -1,3 +1,12 @@
+import { BaseEncodingOptions as Alias1, BigIntOptions as Alias2 } from 'node:fs';
+
+declare global {
+	type Promise$1 = string;
+	type Promise$2 = string;
+	type Date$1 = string;
+	interface Interface1 {
+	}
+}
 interface Promise$3 {
 }
 interface Date$2 {
@@ -8,5 +17,32 @@ export interface Int {
 	localP: Promise$3;
 	globalP: Promise<number>;
 }
+interface Interface1$1 extends Alias1 {
+}
+interface Interface2$1 extends Alias2 {
+}
+declare module "node:fs" {
+	interface BaseEncodingOptions {
+		newField: string;
+	}
+	class BigIntOptions {
+		newField: string;
+	}
+	interface Interface1 {
+	}
+	interface Interface3 extends Interface2$1 {
+	}
+}
+declare global {
+	interface Interface2 {
+	}
+	interface Interface3 extends Interface1$1 {
+	}
+}
+
+export {
+	Interface1$1 as Interface1,
+	Interface2$1 as Interface2,
+};
 
 export {};

tests/e2e/test-cases/names-collision-with-globals/tsconfig.json

@@ -0,0 +1,6 @@
+{
+	"extends": "../tsconfig.json",
+	"compilerOptions": {
+		"types": ["node"]
+	}
+}