diff --git a/internal/checker/utilities.go b/internal/checker/utilities.go
index 873b1f76d2..4fe39be6fe 100644
--- a/internal/checker/utilities.go
+++ b/internal/checker/utilities.go
@@ -1347,6 +1347,9 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 			{lib: "es2018", props: []string{"dotAll"}},
 			{lib: "es2024", props: []string{"unicodeSets"}},
 		},
+		"RegExpConstructor": {
+			{lib: "es2025", props: []string{"escape"}},
+		},
 		"Reflect": {
 			{lib: "es2015", props: []string{"apply", "construct", "defineProperty", "deleteProperty", "get", "getOwnPropertyDescriptor", "getPrototypeOf", "has", "isExtensible", "ownKeys", "preventExtensions", "set", "setPrototypeOf"}},
 		},
@@ -1366,6 +1369,7 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 		},
 		"Math": {
 			{lib: "es2015", props: []string{"clz32", "imul", "sign", "log10", "log2", "log1p", "expm1", "cosh", "sinh", "tanh", "acosh", "asinh", "atanh", "hypot", "trunc", "fround", "cbrt"}},
+			{lib: "es2025", props: []string{"f16round"}},
 		},
 		"Map": {
 			{lib: "es2015", props: []string{"entries", "keys", "values"}},
@@ -1375,7 +1379,7 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 		},
 		"Set": {
 			{lib: "es2015", props: []string{"entries", "keys", "values"}},
-			{lib: "esnext", props: []string{
+			{lib: "es2025", props: []string{
 				"union",
 				"intersection",
 				"difference",
@@ -1390,6 +1394,7 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 			{lib: "es2020", props: []string{"allSettled"}},
 			{lib: "es2021", props: []string{"any"}},
 			{lib: "es2024", props: []string{"withResolvers"}},
+			{lib: "es2025", props: []string{"try"}},
 		},
 		"Symbol": {
 			{lib: "es2015", props: []string{"for", "keyFor"}},
@@ -1428,6 +1433,10 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 		},
 		"Intl": {
 			{lib: "es2018", props: []string{"PluralRules"}},
+			{lib: "es2020", props: []string{"RelativeTimeFormat", "Locale", "DisplayNames"}},
+			{lib: "es2021", props: []string{"ListFormat", "DateTimeFormat"}},
+			{lib: "es2022", props: []string{"Segmenter"}},
+			{lib: "es2025", props: []string{"DurationFormat"}},
 		},
 		"NumberFormat": {
 			{lib: "es2018", props: []string{"formatToParts"}},
@@ -1442,6 +1451,7 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 		},
 		"DataView": {
 			{lib: "es2020", props: []string{"setBigInt64", "setBigUint64", "getBigInt64", "getBigUint64"}},
+			{lib: "es2025", props: []string{"setFloat16", "getFloat16"}},
 		},
 		"BigInt": {
 			{lib: "es2020", props: []string{}},
@@ -1477,6 +1487,9 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 			{lib: "es2022", props: []string{"at"}},
 			{lib: "es2023", props: []string{"findLastIndex", "findLast", "toReversed", "toSorted", "toSpliced", "with"}},
 		},
+		"Float16Array": {
+			{lib: "es2025", props: []string{}},
+		},
 		"Float32Array": {
 			{lib: "es2022", props: []string{"at"}},
 			{lib: "es2023", props: []string{"findLastIndex", "findLast", "toReversed", "toSorted", "toSpliced", "with"}},
@@ -1498,6 +1511,18 @@ var getFeatureMap = sync.OnceValue(func() map[string][]FeatureMapEntry {
 		"Error": {
 			{lib: "es2022", props: []string{"cause"}},
 		},
+		"ErrorConstructor": {
+			{lib: "esnext", props: []string{"isError"}},
+		},
+		"Uint8ArrayConstructor": {
+			{lib: "esnext", props: []string{"fromBase64", "fromHex"}},
+		},
+		"DisposableStack": {
+			{lib: "esnext", props: []string{}},
+		},
+		"AsyncDisposableStack": {
+			{lib: "esnext", props: []string{}},
+		},
 	}
 })
 
diff --git a/internal/transformers/estransforms/definitions.go b/internal/transformers/estransforms/definitions.go
index ca0950aa0b..f28bb7f8f6 100644
--- a/internal/transformers/estransforms/definitions.go
+++ b/internal/transformers/estransforms/definitions.go
@@ -26,7 +26,7 @@ func GetESTransformer(opts *transformers.TransformOptions) *transformers.Transfo
 	switch options.GetEmitScriptTarget() {
 	case core.ScriptTargetESNext:
 		return nil // no transforms needed
-	case /*core.ScriptTargetES2025,*/ core.ScriptTargetES2024, core.ScriptTargetES2023, core.ScriptTargetES2022:
+	case core.ScriptTargetES2025, core.ScriptTargetES2024, core.ScriptTargetES2023, core.ScriptTargetES2022:
 		return NewESNextTransformer(opts)
 	case core.ScriptTargetES2021:
 		return NewES2022Transformer(opts)
diff --git a/testdata/baselines/reference/compiler/declarationEmitQualifiedName.js b/testdata/baselines/reference/compiler/declarationEmitQualifiedName.js
index d0491108e7..d736f2f8c9 100644
--- a/testdata/baselines/reference/compiler/declarationEmitQualifiedName.js
+++ b/testdata/baselines/reference/compiler/declarationEmitQualifiedName.js
@@ -35,7 +35,7 @@ export const A = {
 };
 //// [b.js]
 import { A } from './a.js';
-export const B = Object.assign({}, A);
+export const B = { ...A };
 
 
 //// [e.d.ts]
diff --git a/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js b/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js
index cc2dd20055..96be01245b 100644
--- a/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js
+++ b/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js
@@ -15,6 +15,6 @@ class Base {
     method() { }
 }
 class Derived extends Base {
-    method1() { var _a; return (_a = super.method) === null || _a === void 0 ? void 0 : _a.call(this); }
-    method2() { var _a; return (_a = super["method"]) === null || _a === void 0 ? void 0 : _a.call(this); }
+    method1() { return super.method?.(); }
+    method2() { return super["method"]?.(); }
 }
diff --git a/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js.diff b/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js.diff
deleted file mode 100644
index d6231aaf9c..0000000000
--- a/testdata/baselines/reference/submodule/conformance/callChainWithSuper(target=es2025).js.diff
+++ /dev/null
@@ -1,11 +0,0 @@
---- old.callChainWithSuper(target=es2025).js
-+++ new.callChainWithSuper(target=es2025).js
-@@= skipped -14, +14 lines =@@
-     method() { }
- }
- class Derived extends Base {
--    method1() { return super.method?.(); }
--    method2() { return super["method"]?.(); }
-+    method1() { var _a; return (_a = super.method) === null || _a === void 0 ? void 0 : _a.call(this); }
-+    method2() { var _a; return (_a = super["method"]) === null || _a === void 0 ? void 0 : _a.call(this); }
- }
\ No newline at end of file