When source file is redirected, set the prototype correctly in node factory

src/compiler/factory/nodeFactory.ts

@@ -5275,7 +5275,7 @@ namespace ts {
             hasNoDefaultLib: boolean,
             libReferences: readonly FileReference[]
         ) {
-            const node = baseFactory.createBaseSourceFileNode(SyntaxKind.SourceFile) as Mutable<SourceFile>;
+            const node = (source.redirectInfo ? Object.create(source.redirectInfo.redirectTarget) : baseFactory.createBaseSourceFileNode(SyntaxKind.SourceFile)) as Mutable<SourceFile>;
             for (const p in source) {
                 if (p === "emitNode" || hasProperty(node, p) || !hasProperty(source, p)) continue;
                 (node as any)[p] = (source as any)[p];

src/testRunner/tsconfig.json

@@ -154,6 +154,7 @@
         "unittests/tsc/incremental.ts",
         "unittests/tsc/listFilesOnly.ts",
         "unittests/tsc/projectReferences.ts",
+        "unittests/tsc/redirect.ts",
         "unittests/tsc/runWithoutArgs.ts",
         "unittests/tscWatch/consoleClearing.ts",
         "unittests/tscWatch/emit.ts",

src/testRunner/unittests/tsc/redirect.ts

@@ -0,0 +1,34 @@
+namespace ts {
+    describe("unittests:: tsc:: redirect::", () => {
+        verifyTsc({
+            scenario: "redirect",
+            subScenario: "when redirecting ts file",
+            fs: () => loadProjectFromFiles({
+                "/src/project/tsconfig.json": JSON.stringify({
+                    compilerOptions: {
+                        outDir: "out"
+                    },
+                    include: [
+                        "copy1/node_modules/target/*",
+                        "copy2/node_modules/target/*",
+                    ]
+                }),
+                "/src/project/copy1/node_modules/target/index.ts": "export const a = 1;",
+                "/src/project/copy1/node_modules/target/import.ts": `import {} from "./";`,
+                "/src/project/copy1/node_modules/target/package.json": JSON.stringify({
+                    name: "target",
+                    version: "1.0.0",
+                    main: "index.js",
+                }),
+                "/src/project/copy2/node_modules/target/index.ts": "export const a = 1;",
+                "/src/project/copy2/node_modules/target/import.ts": `import {} from "./";`,
+                "/src/project/copy2/node_modules/target/package.json": JSON.stringify({
+                    name: "target",
+                    version: "1.0.0",
+                    main: "index.js",
+                }),
+            }),
+            commandLineArgs: ["-p", "src/project"],
+        });
+    });
+}

tests/baselines/reference/tsc/redirect/when-redirecting-ts-file.js

@@ -0,0 +1,68 @@
+Input::
+//// [/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+interface ReadonlyArray<T> {}
+declare const console: { log(msg: any): void; };
+
+//// [/src/project/copy1/node_modules/target/import.ts]
+import {} from "./";
+
+//// [/src/project/copy1/node_modules/target/index.ts]
+export const a = 1;
+
+//// [/src/project/copy1/node_modules/target/package.json]
+{"name":"target","version":"1.0.0","main":"index.js"}
+
+//// [/src/project/copy2/node_modules/target/import.ts]
+import {} from "./";
+
+//// [/src/project/copy2/node_modules/target/index.ts]
+export const a = 1;
+
+//// [/src/project/copy2/node_modules/target/package.json]
+{"name":"target","version":"1.0.0","main":"index.js"}
+
+//// [/src/project/tsconfig.json]
+{"compilerOptions":{"outDir":"out"},"include":["copy1/node_modules/target/*","copy2/node_modules/target/*"]}
+
+
+
+Output::
+/lib/tsc -p src/project
+exitCode:: ExitStatus.Success
+
+
+//// [/src/project/out/copy1/node_modules/target/import.js]
+"use strict";
+exports.__esModule = true;
+
+
+//// [/src/project/out/copy1/node_modules/target/index.js]
+"use strict";
+exports.__esModule = true;
+exports.a = void 0;
+exports.a = 1;
+
+
+//// [/src/project/out/copy2/node_modules/target/import.js]
+"use strict";
+exports.__esModule = true;
+
+
+//// [/src/project/out/copy2/node_modules/target/index.js]
+"use strict";
+exports.__esModule = true;
+exports.a = void 0;
+exports.a = 1;
+
+