diff --git a/src/harness/fakes.ts b/src/harness/fakes.ts
index dcc125698c8..489a41dd677 100644
--- a/src/harness/fakes.ts
+++ b/src/harness/fakes.ts
@@ -397,19 +397,6 @@ namespace fakes {
             const value = super.readFile(path);
             if (!value || !ts.isBuildInfoFile(path)) return value;
             const buildInfo = ts.getBuildInfo(value);
-            if (buildInfo.program) {
-                // Fix lib signatures
-                for (const path of ts.getOwnKeys(buildInfo.program.fileInfos)) {
-                    if (ts.startsWith(path, "/lib/")) {
-                        const currentValue = buildInfo.program.fileInfos[path];
-                        ts.Debug.assert(currentValue.signature === path);
-                        ts.Debug.assert(currentValue.signature === currentValue.version);
-                        const text = super.readFile(path)!;
-                        const signature = ts.generateDjb2Hash(text);
-                        buildInfo.program.fileInfos[path] = { version: signature, signature };
-                    }
-                }
-            }
             ts.Debug.assert(buildInfo.version === version);
             buildInfo.version = ts.version;
             return ts.getBuildInfoText(buildInfo);
@@ -419,15 +406,6 @@ namespace fakes {
             if (!ts.isBuildInfoFile(fileName)) return super.writeFile(fileName, content, writeByteOrderMark);
             const buildInfo = ts.getBuildInfo(content);
             if (buildInfo.program) {
-                // Fix lib signatures
-                for (const path of ts.getOwnKeys(buildInfo.program.fileInfos)) {
-                    if (ts.startsWith(path, "/lib/")) {
-                        const currentValue = buildInfo.program.fileInfos[path];
-                        ts.Debug.assert(currentValue.signature === currentValue.version);
-                        buildInfo.program.fileInfos[path] = { version: path, signature: path };
-                    }
-                }
-
                 // reference Map
                 if (buildInfo.program.referencedMap) {
                     const referencedMap: ts.MapLike<string[]> = {};
diff --git a/src/testRunner/unittests/tsbuild/helpers.ts b/src/testRunner/unittests/tsbuild/helpers.ts
index 589ba7a3021..88eb61cd422 100644
--- a/src/testRunner/unittests/tsbuild/helpers.ts
+++ b/src/testRunner/unittests/tsbuild/helpers.ts
@@ -62,31 +62,26 @@ namespace ts {
         }
     }
 
+    const libContent = `${TestFSWithWatch.libFile.content}
+interface ReadonlyArray<T> {}
+declare const console: { log(msg: any): void; };`;
+
     export function loadProjectFromDisk(root: string, time?: vfs.FileSystemOptions["time"]): vfs.FileSystem {
         const resolver = vfs.createResolver(Harness.IO);
         const fs = new vfs.FileSystem(/*ignoreCase*/ true, {
             files: {
-                ["/lib"]: new vfs.Mount(vpath.resolve(Harness.IO.getWorkspaceRoot(), "built/local"), resolver),
                 ["/src"]: new vfs.Mount(vpath.resolve(Harness.IO.getWorkspaceRoot(), root), resolver)
             },
             cwd: "/",
             meta: { defaultLibLocation: "/lib" },
             time
         });
+        fs.mkdirSync("/lib");
+        fs.writeFileSync("/lib/lib.d.ts", libContent);
         fs.makeReadonly();
         return fs;
     }
 
-    export function getLibs() {
-        return [
-            "/lib/lib.d.ts",
-            "/lib/lib.es5.d.ts",
-            "/lib/lib.dom.d.ts",
-            "/lib/lib.webworker.importscripts.d.ts",
-            "/lib/lib.scripthost.d.ts"
-        ];
-    }
-
     function generateSourceMapBaselineFiles(fs: vfs.FileSystem, mapFileNames: ReadonlyArray<string>) {
         for (const mapFile of mapFileNames) {
             if (!fs.existsSync(mapFile)) continue;
diff --git a/src/testRunner/unittests/tsbuild/sample.ts b/src/testRunner/unittests/tsbuild/sample.ts
index ab9210451aa..6e31ada9ee5 100644
--- a/src/testRunner/unittests/tsbuild/sample.ts
+++ b/src/testRunner/unittests/tsbuild/sample.ts
@@ -399,14 +399,14 @@ export class cNew {}`);
                 const builder = createSolutionBuilder(host, ["/src/tests"], { listFiles: true });
                 builder.buildAllProjects();
                 assert.deepEqual(host.traces, [
-                    ...getLibs(),
+                    "/lib/lib.d.ts",
                     "/src/core/anotherModule.ts",
                     "/src/core/index.ts",
                     "/src/core/some_decl.d.ts",
-                    ...getLibs(),
+                    "/lib/lib.d.ts",
                     ...getCoreOutputs(),
                     "/src/logic/index.ts",
-                    ...getLibs(),
+                    "/lib/lib.d.ts",
                     ...getCoreOutputs(),
                     "/src/logic/index.d.ts",
                     "/src/tests/index.ts"
diff --git a/src/testRunner/unittests/tsbuild/transitiveReferences.ts b/src/testRunner/unittests/tsbuild/transitiveReferences.ts
index 7944d1fda09..30e28de8cde 100644
--- a/src/testRunner/unittests/tsbuild/transitiveReferences.ts
+++ b/src/testRunner/unittests/tsbuild/transitiveReferences.ts
@@ -7,12 +7,12 @@ namespace ts {
             "/src/c.js"
         ];
         const expectedFileTraces = [
-            ...getLibs(),
+            "/lib/lib.d.ts",
             "/src/a.ts",
-            ...getLibs(),
+            "/lib/lib.d.ts",
             "/src/a.d.ts",
             "/src/b.ts",
-            ...getLibs(),
+            "/lib/lib.d.ts",
             "/src/a.d.ts",
             "/src/b.d.ts",
             "/src/refs/a.d.ts",
@@ -63,9 +63,9 @@ export const b = new A();`);
             // Error in b build only a
             const allExpectedOutputs = ["/src/a.js", "/src/a.d.ts"];
             const expectedFileTraces = [
-                ...getLibs(),
+                "/lib/lib.d.ts",
                 "/src/a.ts",
-                ...getLibs(),
+                "/lib/lib.d.ts",
                 "/src/b.ts"
             ];
             verifyBuild(fs => modifyFsBTsToNonRelativeImport(fs, "node"),
diff --git a/tests/baselines/reference/tsbuild/lateBoundSymbol/incremental-declaration-doesnt-change/interface-is-merged-and-contains-late-bound-member.js b/tests/baselines/reference/tsbuild/lateBoundSymbol/incremental-declaration-doesnt-change/interface-is-merged-and-contains-late-bound-member.js
index 89748694bbc..b0549b1a8fb 100644
--- a/tests/baselines/reference/tsbuild/lateBoundSymbol/incremental-declaration-doesnt-change/interface-is-merged-and-contains-late-bound-member.js
+++ b/tests/baselines/reference/tsbuild/lateBoundSymbol/incremental-declaration-doesnt-change/interface-is-merged-and-contains-late-bound-member.js
@@ -21,49 +21,13 @@ type A = HKT<number>[typeof sym];
 {
   "program": {
     "fileInfos": {
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
+      "/lib/lib.d.ts": {
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
-      "/lib/lib.es2015.d.ts": {
-        "version": "/lib/lib.es2015.d.ts",
-        "signature": "/lib/lib.es2015.d.ts"
-      },
-      "/lib/lib.es2015.core.d.ts": {
-        "version": "/lib/lib.es2015.core.d.ts",
-        "signature": "/lib/lib.es2015.core.d.ts"
-      },
-      "/lib/lib.es2015.collection.d.ts": {
-        "version": "/lib/lib.es2015.collection.d.ts",
-        "signature": "/lib/lib.es2015.collection.d.ts"
-      },
-      "/lib/lib.es2015.generator.d.ts": {
-        "version": "/lib/lib.es2015.generator.d.ts",
-        "signature": "/lib/lib.es2015.generator.d.ts"
-      },
-      "/lib/lib.es2015.iterable.d.ts": {
-        "version": "/lib/lib.es2015.iterable.d.ts",
-        "signature": "/lib/lib.es2015.iterable.d.ts"
-      },
-      "/lib/lib.es2015.promise.d.ts": {
-        "version": "/lib/lib.es2015.promise.d.ts",
-        "signature": "/lib/lib.es2015.promise.d.ts"
-      },
-      "/lib/lib.es2015.proxy.d.ts": {
-        "version": "/lib/lib.es2015.proxy.d.ts",
-        "signature": "/lib/lib.es2015.proxy.d.ts"
-      },
-      "/lib/lib.es2015.reflect.d.ts": {
-        "version": "/lib/lib.es2015.reflect.d.ts",
-        "signature": "/lib/lib.es2015.reflect.d.ts"
-      },
-      "/lib/lib.es2015.symbol.d.ts": {
-        "version": "/lib/lib.es2015.symbol.d.ts",
-        "signature": "/lib/lib.es2015.symbol.d.ts"
-      },
-      "/lib/lib.es2015.symbol.wellknown.d.ts": {
-        "version": "/lib/lib.es2015.symbol.wellknown.d.ts",
-        "signature": "/lib/lib.es2015.symbol.wellknown.d.ts"
+      "/src/src/globals.d.ts": {
+        "version": "-1994196675",
+        "signature": "-1994196675"
       },
       "/src/src/hkt.ts": {
         "version": "675797797",
@@ -76,9 +40,6 @@ type A = HKT<number>[typeof sym];
     },
     "options": {
       "rootDir": "/src/src",
-      "lib": [
-        "lib.es2015.d.ts"
-      ],
       "incremental": true,
       "configFilePath": "/src/tsconfig.json"
     },
@@ -93,17 +54,8 @@ type A = HKT<number>[typeof sym];
       ]
     },
     "semanticDiagnosticsPerFile": [
-      "/lib/lib.es2015.collection.d.ts",
-      "/lib/lib.es2015.core.d.ts",
-      "/lib/lib.es2015.d.ts",
-      "/lib/lib.es2015.generator.d.ts",
-      "/lib/lib.es2015.iterable.d.ts",
-      "/lib/lib.es2015.promise.d.ts",
-      "/lib/lib.es2015.proxy.d.ts",
-      "/lib/lib.es2015.reflect.d.ts",
-      "/lib/lib.es2015.symbol.d.ts",
-      "/lib/lib.es2015.symbol.wellknown.d.ts",
-      "/lib/lib.es5.d.ts",
+      "/lib/lib.d.ts",
+      "/src/src/globals.d.ts",
       "/src/src/hkt.ts",
       "/src/src/main.ts"
     ]
diff --git a/tests/baselines/reference/tsbuild/lateBoundSymbol/initial-Build/interface-is-merged-and-contains-late-bound-member.js b/tests/baselines/reference/tsbuild/lateBoundSymbol/initial-Build/interface-is-merged-and-contains-late-bound-member.js
index e30b62fcca8..a48d6df88e4 100644
--- a/tests/baselines/reference/tsbuild/lateBoundSymbol/initial-Build/interface-is-merged-and-contains-late-bound-member.js
+++ b/tests/baselines/reference/tsbuild/lateBoundSymbol/initial-Build/interface-is-merged-and-contains-late-bound-member.js
@@ -14,49 +14,13 @@ var x = 10;
 {
   "program": {
     "fileInfos": {
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
+      "/lib/lib.d.ts": {
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
-      "/lib/lib.es2015.d.ts": {
-        "version": "/lib/lib.es2015.d.ts",
-        "signature": "/lib/lib.es2015.d.ts"
-      },
-      "/lib/lib.es2015.core.d.ts": {
-        "version": "/lib/lib.es2015.core.d.ts",
-        "signature": "/lib/lib.es2015.core.d.ts"
-      },
-      "/lib/lib.es2015.collection.d.ts": {
-        "version": "/lib/lib.es2015.collection.d.ts",
-        "signature": "/lib/lib.es2015.collection.d.ts"
-      },
-      "/lib/lib.es2015.generator.d.ts": {
-        "version": "/lib/lib.es2015.generator.d.ts",
-        "signature": "/lib/lib.es2015.generator.d.ts"
-      },
-      "/lib/lib.es2015.iterable.d.ts": {
-        "version": "/lib/lib.es2015.iterable.d.ts",
-        "signature": "/lib/lib.es2015.iterable.d.ts"
-      },
-      "/lib/lib.es2015.promise.d.ts": {
-        "version": "/lib/lib.es2015.promise.d.ts",
-        "signature": "/lib/lib.es2015.promise.d.ts"
-      },
-      "/lib/lib.es2015.proxy.d.ts": {
-        "version": "/lib/lib.es2015.proxy.d.ts",
-        "signature": "/lib/lib.es2015.proxy.d.ts"
-      },
-      "/lib/lib.es2015.reflect.d.ts": {
-        "version": "/lib/lib.es2015.reflect.d.ts",
-        "signature": "/lib/lib.es2015.reflect.d.ts"
-      },
-      "/lib/lib.es2015.symbol.d.ts": {
-        "version": "/lib/lib.es2015.symbol.d.ts",
-        "signature": "/lib/lib.es2015.symbol.d.ts"
-      },
-      "/lib/lib.es2015.symbol.wellknown.d.ts": {
-        "version": "/lib/lib.es2015.symbol.wellknown.d.ts",
-        "signature": "/lib/lib.es2015.symbol.wellknown.d.ts"
+      "/src/src/globals.d.ts": {
+        "version": "-1994196675",
+        "signature": "-1994196675"
       },
       "/src/src/hkt.ts": {
         "version": "675797797",
@@ -69,9 +33,6 @@ var x = 10;
     },
     "options": {
       "rootDir": "/src/src",
-      "lib": [
-        "lib.es2015.d.ts"
-      ],
       "incremental": true,
       "configFilePath": "/src/tsconfig.json"
     },
@@ -86,17 +47,8 @@ var x = 10;
       ]
     },
     "semanticDiagnosticsPerFile": [
-      "/lib/lib.es2015.collection.d.ts",
-      "/lib/lib.es2015.core.d.ts",
-      "/lib/lib.es2015.d.ts",
-      "/lib/lib.es2015.generator.d.ts",
-      "/lib/lib.es2015.iterable.d.ts",
-      "/lib/lib.es2015.promise.d.ts",
-      "/lib/lib.es2015.proxy.d.ts",
-      "/lib/lib.es2015.reflect.d.ts",
-      "/lib/lib.es2015.symbol.d.ts",
-      "/lib/lib.es2015.symbol.wellknown.d.ts",
-      "/lib/lib.es5.d.ts",
+      "/lib/lib.d.ts",
+      "/src/src/globals.d.ts",
       "/src/src/hkt.ts",
       "/src/src/main.ts"
     ]
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/sample.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/sample.js
index c1274f3f49f..a698d6c34cf 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/sample.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/sample.js
@@ -172,24 +172,8 @@ export class someClass { }
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -215,10 +199,6 @@ export class someClass { }
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
@@ -232,24 +212,8 @@ export class someClass { }
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-2069755619",
@@ -285,10 +249,6 @@ export class someClass { }
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts"
@@ -302,24 +262,8 @@ export class someClass { }
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-2069755619",
@@ -365,10 +309,6 @@ export class someClass { }
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts",
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-declaration-option-changes.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-declaration-option-changes.js
index ad16296e10c..69c7b20d506 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-declaration-option-changes.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-declaration-option-changes.js
@@ -21,24 +21,8 @@ export declare function multiply(a: number, b: number): number;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -63,10 +47,6 @@ export declare function multiply(a: number, b: number): number;
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-logic-config-changes-declaration-dir.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-logic-config-changes-declaration-dir.js
index 3412d1c89a2..53f222a4bf5 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-logic-config-changes-declaration-dir.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/when-logic-config-changes-declaration-dir.js
@@ -25,24 +25,8 @@ export declare const m: typeof mod;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -79,10 +63,6 @@ export declare const m: typeof mod;
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts"
@@ -96,24 +76,8 @@ export declare const m: typeof mod;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -159,10 +123,6 @@ export declare const m: typeof mod;
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts",
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-doesnt-change/sample.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-doesnt-change/sample.js
index 85fcc62cfc9..aae81ea9fdc 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-doesnt-change/sample.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-doesnt-change/sample.js
@@ -25,24 +25,8 @@ class someClass { }
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -68,10 +52,6 @@ class someClass { }
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
diff --git a/tests/baselines/reference/tsbuild/sample1/initial-Build/sample.js b/tests/baselines/reference/tsbuild/sample1/initial-Build/sample.js
index 21e8c9b820f..ef63741766a 100644
--- a/tests/baselines/reference/tsbuild/sample1/initial-Build/sample.js
+++ b/tests/baselines/reference/tsbuild/sample1/initial-Build/sample.js
@@ -185,24 +185,8 @@ exports.multiply = multiply;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -228,10 +212,6 @@ exports.multiply = multiply;
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
@@ -390,24 +370,8 @@ sourceFile:index.ts
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -443,10 +407,6 @@ sourceFile:index.ts
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts"
@@ -476,24 +436,8 @@ exports.m = mod;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -539,10 +483,6 @@ exports.m = mod;
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts",
diff --git a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-declaration-option-changes.js b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-declaration-option-changes.js
index 341b277de0d..90f10c0a25c 100644
--- a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-declaration-option-changes.js
+++ b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-declaration-option-changes.js
@@ -27,24 +27,8 @@ exports.multiply = multiply;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -68,10 +52,6 @@ exports.multiply = multiply;
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
diff --git a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-config-changes-declaration-dir.js b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-config-changes-declaration-dir.js
index 21e8c9b820f..ef63741766a 100644
--- a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-config-changes-declaration-dir.js
+++ b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-config-changes-declaration-dir.js
@@ -185,24 +185,8 @@ exports.multiply = multiply;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -228,10 +212,6 @@ exports.multiply = multiply;
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
@@ -390,24 +370,8 @@ sourceFile:index.ts
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -443,10 +407,6 @@ sourceFile:index.ts
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts"
@@ -476,24 +436,8 @@ exports.m = mod;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -539,10 +483,6 @@ exports.m = mod;
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts",
diff --git a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-specifies-tsBuildInfoFile.js b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-specifies-tsBuildInfoFile.js
index 990a019c479..b3b74cb388c 100644
--- a/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-specifies-tsBuildInfoFile.js
+++ b/tests/baselines/reference/tsbuild/sample1/initial-Build/when-logic-specifies-tsBuildInfoFile.js
@@ -185,24 +185,8 @@ exports.multiply = multiply;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/anothermodule.ts": {
         "version": "-2676574883",
@@ -228,10 +212,6 @@ exports.multiply = multiply;
     "exportedModulesMap": {},
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/core/some_decl.d.ts"
@@ -390,24 +370,8 @@ sourceFile:index.ts
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -444,10 +408,6 @@ sourceFile:index.ts
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts"
@@ -493,24 +453,8 @@ exports.m = mod;
   "program": {
     "fileInfos": {
       "/lib/lib.d.ts": {
-        "version": "/lib/lib.d.ts",
-        "signature": "/lib/lib.d.ts"
-      },
-      "/lib/lib.es5.d.ts": {
-        "version": "/lib/lib.es5.d.ts",
-        "signature": "/lib/lib.es5.d.ts"
-      },
-      "/lib/lib.dom.d.ts": {
-        "version": "/lib/lib.dom.d.ts",
-        "signature": "/lib/lib.dom.d.ts"
-      },
-      "/lib/lib.webworker.importscripts.d.ts": {
-        "version": "/lib/lib.webworker.importscripts.d.ts",
-        "signature": "/lib/lib.webworker.importscripts.d.ts"
-      },
-      "/lib/lib.scripthost.d.ts": {
-        "version": "/lib/lib.scripthost.d.ts",
-        "signature": "/lib/lib.scripthost.d.ts"
+        "version": "-15964756381",
+        "signature": "-15964756381"
       },
       "/src/core/index.ts": {
         "version": "-13851440507",
@@ -556,10 +500,6 @@ exports.m = mod;
     },
     "semanticDiagnosticsPerFile": [
       "/lib/lib.d.ts",
-      "/lib/lib.dom.d.ts",
-      "/lib/lib.es5.d.ts",
-      "/lib/lib.scripthost.d.ts",
-      "/lib/lib.webworker.importscripts.d.ts",
       "/src/core/anothermodule.ts",
       "/src/core/index.ts",
       "/src/logic/index.ts",
diff --git a/tests/projects/lateBoundSymbol/src/globals.d.ts b/tests/projects/lateBoundSymbol/src/globals.d.ts
new file mode 100644
index 00000000000..8100e5859af
--- /dev/null
+++ b/tests/projects/lateBoundSymbol/src/globals.d.ts
@@ -0,0 +1,4 @@
+interface SymbolConstructor {
+    (description?: string | number): symbol;
+}
+declare var Symbol: SymbolConstructor;
\ No newline at end of file
diff --git a/tests/projects/lateBoundSymbol/tsconfig.json b/tests/projects/lateBoundSymbol/tsconfig.json
index 78bf9e23f00..6146e91d1f3 100644
--- a/tests/projects/lateBoundSymbol/tsconfig.json
+++ b/tests/projects/lateBoundSymbol/tsconfig.json
@@ -1,9 +1,6 @@
 {
   "compilerOptions": {
     "rootDir": "src",
-    "lib": [
-      "es2015"
-    ],
     "incremental": true
   }
 }
\ No newline at end of file
diff --git a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withFiles.json b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withFiles.json
index 71097850dbf..e463caf4879 100644
--- a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withFiles.json
+++ b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withFiles.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "composite": true,
-    "target": "esnext",
     "moduleResolution": "node",
     "module": "commonjs",
     "resolveJsonModule": true,
diff --git a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withInclude.json b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withInclude.json
index 5efdbe28ac4..dde5eec33c4 100644
--- a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withInclude.json
+++ b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withInclude.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "composite": true,
-    "target": "esnext",
     "moduleResolution": "node",
     "module": "commonjs",
     "resolveJsonModule": true,
diff --git a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeAndFiles.json b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeAndFiles.json
index f50c629bac5..82da9b398a7 100644
--- a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeAndFiles.json
+++ b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeAndFiles.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "composite": true,
-    "target": "esnext",
     "moduleResolution": "node",
     "module": "commonjs",
     "resolveJsonModule": true,
diff --git a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeOfJson.json b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeOfJson.json
index 72d960b6fba..47279604fa6 100644
--- a/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeOfJson.json
+++ b/tests/projects/resolveJsonModuleAndComposite/tsconfig_withIncludeOfJson.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "composite": true,
-    "target": "esnext",
     "moduleResolution": "node",
     "module": "commonjs",
     "resolveJsonModule": true,