Fix for dts emit for tripple slash directives in d.ts files (#1519)

Co-authored-by: Copilot <[email protected]>

Author: sheetalkamat

internal/printer/printer.go

@@ -4403,6 +4403,9 @@ func (p *Printer) emitSourceFile(node *ast.SourceFile) {
 		p.emitShebangIfNeeded(node)
 		index = p.emitPrologueDirectives(node.Statements)
 		p.emitHelpers(node.AsNode())
+		if node.IsDeclarationFile {
+			p.emitTripleSlashDirectives(node)
+		}
 	}
 
 	// !!! Emit triple-slash directives
@@ -4420,6 +4423,23 @@ func (p *Printer) emitSourceFile(node *ast.SourceFile) {
 	p.commentsDisabled = savedCommentsDisabled
 }
 
+func (p *Printer) emitTripleSlashDirectives(node *ast.SourceFile) {
+	p.emitDirective("path", node.ReferencedFiles)
+	p.emitDirective("types", node.TypeReferenceDirectives)
+	p.emitDirective("lib", node.LibReferenceDirectives)
+}
+
+func (p *Printer) emitDirective(kind string, refs []*ast.FileReference) {
+	for _, ref := range refs {
+		var resolutionMode string
+		if ref.ResolutionMode != core.ResolutionModeNone {
+			resolutionMode = fmt.Sprintf(`resolution-mode="%s" `, core.IfElse(ref.ResolutionMode == core.ResolutionModeESM, "import", "require"))
+		}
+		p.writeComment(fmt.Sprintf("/// <reference %s=\"%s\" %s%s/>", kind, ref.FileName, resolutionMode, core.IfElse(ref.Preserve, `preserve="true" `, "")))
+		p.writeLine()
+	}
+}
+
 //
 // Lists
 //

testdata/baselines/reference/submodule/compiler/commonSourceDirectory.js

@@ -25,4 +25,5 @@ foo_1.x + bar_1.y;
 //# sourceMappingURL=../myMapRoot/index.js.map
 
 //// [/app/bin/index.d.ts]
+/// <reference path="../../types/bar.d.ts" preserve="true" />
 export {};

testdata/baselines/reference/submodule/compiler/commonSourceDirectory.js.diff

@@ -10,7 +10,3 @@
 +const bar_1 = require("bar");
  foo_1.x + bar_1.y;
  //# sourceMappingURL=../myMapRoot/index.js.map
-
- //// [/app/bin/index.d.ts]
--/// <reference path="../../types/bar.d.ts" preserve="true" />
- export {};

testdata/baselines/reference/submodule/compiler/commonSourceDirectory_dts.js

@@ -17,4 +17,5 @@ exports.x = y;
 //# sourceMappingURL=../src/myMapRoot/index.js.map
 
 //// [/app/bin/index.d.ts]
+/// <reference path="../lib/bar.d.ts" preserve="true" />
 export declare const x: number;

testdata/baselines/reference/submodule/compiler/commonSourceDirectory_dts.js.diff

@@ -34,29 +34,6 @@ declare module "SubModule" {
     }
 }
 //// [declFileAmbientExternalModuleWithSingleExportedModule_1.d.ts]
+/// <reference path="declFileAmbientExternalModuleWithSingleExportedModule_0.d.ts" preserve="true" />
 import SubModule = require('SubModule');
 export declare var x: SubModule.m.m3.c;
-
-
-//// [DtsFileErrors]
-
-
-declFileAmbientExternalModuleWithSingleExportedModule_1.d.ts(1,28): error TS2307: Cannot find module 'SubModule' or its corresponding type declarations.
-
-
-==== declFileAmbientExternalModuleWithSingleExportedModule_1.d.ts (1 errors) ====
-    import SubModule = require('SubModule');
-                               ~~~~~~~~~~~
-!!! error TS2307: Cannot find module 'SubModule' or its corresponding type declarations.
-    export declare var x: SubModule.m.m3.c;
-    
-==== declFileAmbientExternalModuleWithSingleExportedModule_0.d.ts (0 errors) ====
-    declare module "SubModule" {
-        namespace m {
-            namespace m3 {
-                interface c {
-                }
-            }
-        }
-    }
-    

testdata/baselines/reference/submodule/compiler/declFileAmbientExternalModuleWithSingleExportedModule.js

@@ -21,4 +21,5 @@ var x = new M.C(); // Declaration file wont get emitted because there are errors
 
 
 //// [client.d.ts]
+/// <reference path="declFile.d.ts" preserve="true" />
 declare var x: M.C; // Declaration file wont get emitted because there are errors in declaration file

testdata/baselines/reference/submodule/compiler/declFileAmbientExternalModuleWithSingleExportedModule.js.diff

@@ -1,9 +1,8 @@
 --- old.declFileWithErrorsInInputDeclarationFile.js
 +++ new.declFileWithErrorsInInputDeclarationFile.js
-@@= skipped -20, +20 lines =@@
-
+@@= skipped -21, +21 lines =@@
 
  //// [client.d.ts]
--/// <reference path="declFile.d.ts" preserve="true" />
+ /// <reference path="declFile.d.ts" preserve="true" />
 -declare var x: M.C;
 +declare var x: M.C; // Declaration file wont get emitted because there are errors in declaration file

testdata/baselines/reference/submodule/compiler/declFileWithErrorsInInputDeclarationFile.js

@@ -24,42 +24,5 @@ export async function drainStream(stream: NodeJS.ReadableStream): Promise<void>
 
 
 //// [app.d.mts]
+/// <reference types="node" preserve="true" />
 export declare function drainStream(stream: NodeJS.ReadableStream): Promise<void>;
-
-
-//// [DtsFileErrors]
-
-
-/app.d.mts(1,45): error TS2503: Cannot find namespace 'NodeJS'.
-
-
-==== /tsconfig.json (0 errors) ====
-    {
-      "compilerOptions": {
-        "module": "nodenext",
-        "types": [],
-        "declaration": true,
-        "emitDeclarationOnly": true,
-      }
-    }
-    
-==== /app.d.mts (1 errors) ====
-    export declare function drainStream(stream: NodeJS.ReadableStream): Promise<void>;
-                                                ~~~~~~
-!!! error TS2503: Cannot find namespace 'NodeJS'.
-    
-==== /node_modules/@types/node/package.json (0 errors) ====
-    {
-      "name": "@types/node",
-      "version": "1.0.0",
-      "types": "index.d.ts"
-    }
-    
-==== /node_modules/@types/node/globals.d.ts (0 errors) ====
-    declare namespace NodeJS {
-      interface ReadableStream {}
-    }
-    
-==== /node_modules/@types/node/index.d.ts (0 errors) ====
-    /// <reference path="globals.d.ts" />
-