Handling declaration of modules that are "unknown" i.e. there is no value declaration for them

Fixes #312

Author: timocov

src/bundle-generator.ts

@@ -569,7 +569,7 @@ export function generateDtsBundle(entries: readonly EntryPointConfig[], options:
 				return;
 			}
 
-			const referencedModuleInfo = getReferencedModuleInfo(moduleDecl, criteria, typeChecker);
+			const referencedModuleInfo = getModuleLikeModuleInfo(moduleDecl, criteria, typeChecker);
 			if (referencedModuleInfo === null) {
 				return;
 			}

tests/e2e/test-cases/declare-unknown-modules/config.ts

@@ -0,0 +1,9 @@
+import { TestCaseConfig } from '../../test-cases/test-case-config';
+
+const config: TestCaseConfig = {
+	output: {
+		inlineDeclareExternals: true,
+	},
+};
+
+export = config;

tests/e2e/test-cases/declare-unknown-modules/index.spec.js

@@ -0,0 +1 @@
+require('../run-test-case').runTestCase(__dirname);

tests/e2e/test-cases/declare-unknown-modules/input.d.ts

@@ -0,0 +1,3 @@
+/// <reference path="./modules.d.ts" preserve="true" />
+
+export {};

tests/e2e/test-cases/declare-unknown-modules/modules.d.ts

@@ -0,0 +1,4 @@
+declare module '*.css' {}
+
+declare module 'module-that-does-not-exist-actually' {
+}

tests/e2e/test-cases/declare-unknown-modules/output.d.ts

@@ -0,0 +1,5 @@
+declare module "*.css" { }
+declare module "module-that-does-not-exist-actually" {
+}
+
+export {};