diff --git a/tsc/internal/parser/parser.go b/tsc/internal/parser/parser.go
index c670d64ad21c2..e37c5b193fb6a 100644
--- a/tsc/internal/parser/parser.go
+++ b/tsc/internal/parser/parser.go
@@ -4691,6 +4691,9 @@ func (p *Parser) parseBinaryExpressionRest(precedence ast.OperatorPrecedence, le
 		if !shouldConsumeBinaryOperator(operator, newPrecedence, precedence) {
 			break
 		}
+		if p.hasPrecedingLineBreak() && (p.scanner.HasUnicodeEscape() || p.scanner.HasExtendedUnicodeEscape()) && ast.NodeIsPresent(leftOperand) {
+			break
+		}
 		if operator == ast.KindInKeyword && p.inDisallowInContext() {
 			break
 		}
diff --git a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.errors.txt b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.errors.txt
index 3f909bf206319..4c75c99a59b0d 100644
--- a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.errors.txt
+++ b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.errors.txt
@@ -1,3 +1,9 @@
+c.ts(3,15): error TS1260: Keywords cannot contain escape characters.
+c.ts(4,14): error TS1260: Keywords cannot contain escape characters.
+d.js(3,15): error TS1260: Keywords cannot contain escape characters.
+d.js(4,14): error TS1260: Keywords cannot contain escape characters.
+e.ts(5,9): error TS1451: Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression
+f.js(5,9): error TS1451: Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression
 file1.ts(3,5): error TS1260: Keywords cannot contain escape characters.
 file1.ts(8,5): error TS1260: Keywords cannot contain escape characters.
 file1.ts(13,1): error TS1260: Keywords cannot contain escape characters.
@@ -5,6 +11,16 @@ file2.ts(1,1): error TS1260: Keywords cannot contain escape characters.
 file2.ts(5,5): error TS1260: Keywords cannot contain escape characters.
 file2.ts(10,5): error TS1260: Keywords cannot contain escape characters.
 file2.ts(15,1): error TS1260: Keywords cannot contain escape characters.
+g.ts(3,1): error TS1109: Expression expected.
+g.ts(3,8): error TS1109: Expression expected.
+h.ts(3,1): error TS1109: Expression expected.
+i.ts(3,5): error TS1005: ')' expected.
+i.ts(3,14): error TS1005: ';' expected.
+j.js(3,1): error TS1109: Expression expected.
+j.js(3,8): error TS1109: Expression expected.
+k.js(3,1): error TS1109: Expression expected.
+l.js(3,5): error TS1005: ')' expected.
+l.js(3,14): error TS1005: ';' expected.
 
 
 ==== file1.ts (3 errors) ====
@@ -58,4 +74,194 @@ file2.ts(15,1): error TS1260: Keywords cannot contain escape characters.
     
     const a = {def\u0061ult: 12}; // OK, `default` not in keyword position
     // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
+    
+==== a.ts (0 errors) ====
+    export {};
+    
+    class A {
+        a = 1
+        \u{69}n
+        b = 2
+        \u{69}nstanceof
+    }
+    
+    class B {
+        a = 1
+        \u0069n
+        b = 2
+        \u0069nstanceof
+    }
+    
+    class C {
+        a = () => 1
+        \u{69}nstanceof
+        b = 2
+        \u0069n() {}
+    }
+    
+    class D {
+        a = "a"
+        in
+        { a: 1 }
+        b = {}
+        instanceof
+        Object
+    }
+    
+    class E {
+        a = 1;
+        \u0069n = 2;
+        b = 3;
+        \u{69}nstanceof = 4;
+    }
+    
+    const a = Object.keys(new A());
+    const b = Object.keys(new B());
+    const c = new C();
+    const d = new D();
+    const e = 1;
+    const f = \u0065
+        + 1;
+    
+==== b.js (0 errors) ====
+    export {};
+    
+    class A {
+        a = 1
+        \u{69}n
+        b = 2
+        \u{69}nstanceof
+    }
+    
+    class B {
+        a = 1
+        \u0069n
+        b = 2
+        \u0069nstanceof
+    }
+    
+    class C {
+        a = () => 1
+        \u{69}nstanceof
+        b = 2
+        \u0069n() {}
+    }
+    
+    class D {
+        a = "a"
+        in
+        { a: 1 }
+        b = {}
+        instanceof
+        Object
+    }
+    
+    class E {
+        a = 1;
+        \u0069n = 2;
+        b = 3;
+        \u{69}nstanceof = 4;
+    }
+    
+    const a = Object.keys(new A());
+    const b = Object.keys(new B());
+    const c = new C();
+    const d = new D();
+    const e = 1;
+    const f = \u0065
+        + 1;
+    
+==== c.ts (2 errors) ====
+    export {};
+    
+    const a = "a" \u0069n { a: 1 };
+                  ~~~~~~~
+!!! error TS1260: Keywords cannot contain escape characters.
+    const b = {} \u{69}nstanceof Object;
+                 ~~~~~~~~~~~~~~~
+!!! error TS1260: Keywords cannot contain escape characters.
+    
+==== d.js (2 errors) ====
+    export {};
+    
+    const a = "a" \u0069n { a: 1 };
+                  ~~~~~~~
+!!! error TS1260: Keywords cannot contain escape characters.
+    const b = {} \u{69}nstanceof Object;
+                 ~~~~~~~~~~~~~~~
+!!! error TS1260: Keywords cannot contain escape characters.
+    
+==== e.ts (1 errors) ====
+    export {};
+    
+    class A {
+        #a;
+        b = #a
+            ~~
+!!! error TS1451: Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression
+        \u0069n
+    }
+    
+==== f.js (1 errors) ====
+    export {};
+    
+    class A {
+        #a;
+        b = #a
+            ~~
+!!! error TS1451: Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression
+        \u0069n
+    }
+    
+==== g.ts (2 errors) ====
+    declare var x: any, y: any;
+    x
+    \u0069n
+    ~~~~~~~
+!!! error TS1109: Expression expected.
+           
+!!! error TS1109: Expression expected.
+    
+==== h.ts (1 errors) ====
+    declare var x: any, y: any;
+    x
+    \u{69}nstanceof y
+    ~~~~~~~~~~~~~~~
+!!! error TS1109: Expression expected.
+    
+==== i.ts (2 errors) ====
+    declare var x: any, y: any;
+    if (x
+        \u0069n y) {}
+        ~~~~~~~
+!!! error TS1005: ')' expected.
+!!! related TS1007 i.ts:2:4: The parser expected to find a ')' to match the '(' token here.
+                 ~
+!!! error TS1005: ';' expected.
+    
+==== j.js (2 errors) ====
+    var x, y;
+    x
+    \u0069n
+    ~~~~~~~
+!!! error TS1109: Expression expected.
+           
+!!! error TS1109: Expression expected.
+    
+==== k.js (1 errors) ====
+    var x, y;
+    x
+    \u{69}nstanceof y
+    ~~~~~~~~~~~~~~~
+!!! error TS1109: Expression expected.
+    
+==== l.js (2 errors) ====
+    var x, y;
+    if (x
+        \u0069n y) {}
+        ~~~~~~~
+!!! error TS1005: ')' expected.
+!!! related TS1007 l.js:2:4: The parser expected to find a ')' to match the '(' token here.
+                 ~
+!!! error TS1005: ';' expected.
     
\ No newline at end of file
diff --git a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.js b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.js
index eda3976c557f1..59ed814299d5e 100644
--- a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.js
+++ b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.js
@@ -38,6 +38,162 @@ export {};
 const a = {def\u0061ult: 12}; // OK, `default` not in keyword position
 // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
 
+//// [a.ts]
+export {};
+
+class A {
+    a = 1
+    \u{69}n
+    b = 2
+    \u{69}nstanceof
+}
+
+class B {
+    a = 1
+    \u0069n
+    b = 2
+    \u0069nstanceof
+}
+
+class C {
+    a = () => 1
+    \u{69}nstanceof
+    b = 2
+    \u0069n() {}
+}
+
+class D {
+    a = "a"
+    in
+    { a: 1 }
+    b = {}
+    instanceof
+    Object
+}
+
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+
+//// [b.js]
+export {};
+
+class A {
+    a = 1
+    \u{69}n
+    b = 2
+    \u{69}nstanceof
+}
+
+class B {
+    a = 1
+    \u0069n
+    b = 2
+    \u0069nstanceof
+}
+
+class C {
+    a = () => 1
+    \u{69}nstanceof
+    b = 2
+    \u0069n() {}
+}
+
+class D {
+    a = "a"
+    in
+    { a: 1 }
+    b = {}
+    instanceof
+    Object
+}
+
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+
+//// [c.ts]
+export {};
+
+const a = "a" \u0069n { a: 1 };
+const b = {} \u{69}nstanceof Object;
+
+//// [d.js]
+export {};
+
+const a = "a" \u0069n { a: 1 };
+const b = {} \u{69}nstanceof Object;
+
+//// [e.ts]
+export {};
+
+class A {
+    #a;
+    b = #a
+    \u0069n
+}
+
+//// [f.js]
+export {};
+
+class A {
+    #a;
+    b = #a
+    \u0069n
+}
+
+//// [g.ts]
+declare var x: any, y: any;
+x
+\u0069n
+
+//// [h.ts]
+declare var x: any, y: any;
+x
+\u{69}nstanceof y
+
+//// [i.ts]
+declare var x: any, y: any;
+if (x
+    \u0069n y) {}
+
+//// [j.js]
+var x, y;
+x
+\u0069n
+
+//// [k.js]
+var x, y;
+x
+\u{69}nstanceof y
+
+//// [l.js]
+var x, y;
+if (x
+    \u0069n y) {}
+
 
 //// [file1.js]
 var \u0061wait = 12; // ok
@@ -62,3 +218,138 @@ function* gen() {
 const a = { def\u0061ult: 12 }; // OK, `default` not in keyword position
 export {};
 // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
+//// [a.js]
+class A {
+    a = 1;
+    \u{69}n;
+    b = 2;
+    \u{69}nstanceof;
+}
+class B {
+    a = 1;
+    \u0069n;
+    b = 2;
+    \u0069nstanceof;
+}
+class C {
+    a = () => 1;
+    \u{69}nstanceof;
+    b = 2;
+    \u0069n() { }
+}
+class D {
+    a = "a"
+        in
+            { a: 1 };
+    b = {}
+        instanceof
+            Object;
+}
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+export {};
+//// [b.js]
+export {};
+class A {
+    a = 1;
+    \u{69}n;
+    b = 2;
+    \u{69}nstanceof;
+}
+class B {
+    a = 1;
+    \u0069n;
+    b = 2;
+    \u0069nstanceof;
+}
+class C {
+    a = () => 1;
+    \u{69}nstanceof;
+    b = 2;
+    \u0069n() { }
+}
+class D {
+    a = "a"
+        in
+            { a: 1 };
+    b = {}
+        instanceof
+            Object;
+}
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+//// [c.js]
+const a = "a" in { a: 1 };
+const b = {} instanceof Object;
+export {};
+//// [d.js]
+export {};
+const a = "a" in { a: 1 };
+const b = {} instanceof Object;
+//// [e.js]
+class A {
+    #a;
+    b = #a;
+    \u0069n;
+}
+export {};
+//// [f.js]
+export {};
+class A {
+    #a;
+    b = #a;
+    \u0069n;
+}
+//// [g.js]
+"use strict";
+x;
+    in
+;
+//// [h.js]
+"use strict";
+x;
+    instanceof y;
+//// [i.js]
+"use strict";
+if (x)
+        in y;
+{ }
+//// [j.js]
+"use strict";
+var x, y;
+x;
+    in
+;
+//// [k.js]
+"use strict";
+var x, y;
+x;
+    instanceof y;
+//// [l.js]
+"use strict";
+var x, y;
+if (x)
+        in y;
+{ }
diff --git a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.symbols b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.symbols
index 7c4b7f2af98b7..1ad704232f24c 100644
--- a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.symbols
+++ b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.symbols
@@ -62,3 +62,353 @@ const a = {def\u0061ult: 12}; // OK, `default` not in keyword position
 
 // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
 
+=== a.ts ===
+export {};
+
+class A {
+>A : Symbol(A, Decl(a.ts, 0, 10))
+
+    a = 1
+>a : Symbol(A.a, Decl(a.ts, 2, 9))
+
+    \u{69}n
+>\u{69}n : Symbol(A[\u{69}n], Decl(a.ts, 3, 9))
+
+    b = 2
+>b : Symbol(A.b, Decl(a.ts, 4, 11))
+
+    \u{69}nstanceof
+>\u{69}nstanceof : Symbol(A[\u{69}nstanceof], Decl(a.ts, 5, 9))
+}
+
+class B {
+>B : Symbol(B, Decl(a.ts, 7, 1))
+
+    a = 1
+>a : Symbol(B.a, Decl(a.ts, 9, 9))
+
+    \u0069n
+>\u0069n : Symbol(B[\u0069n], Decl(a.ts, 10, 9))
+
+    b = 2
+>b : Symbol(B.b, Decl(a.ts, 11, 11))
+
+    \u0069nstanceof
+>\u0069nstanceof : Symbol(B[\u0069nstanceof], Decl(a.ts, 12, 9))
+}
+
+class C {
+>C : Symbol(C, Decl(a.ts, 14, 1))
+
+    a = () => 1
+>a : Symbol(C.a, Decl(a.ts, 16, 9))
+
+    \u{69}nstanceof
+>\u{69}nstanceof : Symbol(C[\u{69}nstanceof], Decl(a.ts, 17, 15))
+
+    b = 2
+>b : Symbol(C.b, Decl(a.ts, 18, 19))
+
+    \u0069n() {}
+>\u0069n : Symbol(C[\u0069n], Decl(a.ts, 19, 9))
+}
+
+class D {
+>D : Symbol(D, Decl(a.ts, 21, 1))
+
+    a = "a"
+>a : Symbol(D.a, Decl(a.ts, 23, 9))
+
+    in
+    { a: 1 }
+>a : Symbol(a, Decl(a.ts, 26, 5))
+
+    b = {}
+>b : Symbol(D.b, Decl(a.ts, 26, 12))
+
+    instanceof
+    Object
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+}
+
+class E {
+>E : Symbol(E, Decl(a.ts, 30, 1))
+
+    a = 1;
+>a : Symbol(E.a, Decl(a.ts, 32, 9))
+
+    \u0069n = 2;
+>\u0069n : Symbol(E[\u0069n], Decl(a.ts, 33, 10))
+
+    b = 3;
+>b : Symbol(E.b, Decl(a.ts, 34, 16))
+
+    \u{69}nstanceof = 4;
+>\u{69}nstanceof : Symbol(E[\u{69}nstanceof], Decl(a.ts, 35, 10))
+}
+
+const a = Object.keys(new A());
+>a : Symbol(a, Decl(a.ts, 39, 5))
+>Object.keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>A : Symbol(A, Decl(a.ts, 0, 10))
+
+const b = Object.keys(new B());
+>b : Symbol(b, Decl(a.ts, 40, 5))
+>Object.keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>B : Symbol(B, Decl(a.ts, 7, 1))
+
+const c = new C();
+>c : Symbol(c, Decl(a.ts, 41, 5))
+>C : Symbol(C, Decl(a.ts, 14, 1))
+
+const d = new D();
+>d : Symbol(d, Decl(a.ts, 42, 5))
+>D : Symbol(D, Decl(a.ts, 21, 1))
+
+const e = 1;
+>e : Symbol(e, Decl(a.ts, 43, 5))
+
+const f = \u0065
+>f : Symbol(f, Decl(a.ts, 44, 5))
+>\u0065 : Symbol(e, Decl(a.ts, 43, 5))
+
+    + 1;
+
+=== b.js ===
+export {};
+
+class A {
+>A : Symbol(A, Decl(b.js, 0, 10))
+
+    a = 1
+>a : Symbol(A.a, Decl(b.js, 2, 9))
+
+    \u{69}n
+>\u{69}n : Symbol(A[\u{69}n], Decl(b.js, 3, 9))
+
+    b = 2
+>b : Symbol(A.b, Decl(b.js, 4, 11))
+
+    \u{69}nstanceof
+>\u{69}nstanceof : Symbol(A[\u{69}nstanceof], Decl(b.js, 5, 9))
+}
+
+class B {
+>B : Symbol(B, Decl(b.js, 7, 1))
+
+    a = 1
+>a : Symbol(B.a, Decl(b.js, 9, 9))
+
+    \u0069n
+>\u0069n : Symbol(B[\u0069n], Decl(b.js, 10, 9))
+
+    b = 2
+>b : Symbol(B.b, Decl(b.js, 11, 11))
+
+    \u0069nstanceof
+>\u0069nstanceof : Symbol(B[\u0069nstanceof], Decl(b.js, 12, 9))
+}
+
+class C {
+>C : Symbol(C, Decl(b.js, 14, 1))
+
+    a = () => 1
+>a : Symbol(C.a, Decl(b.js, 16, 9))
+
+    \u{69}nstanceof
+>\u{69}nstanceof : Symbol(C[\u{69}nstanceof], Decl(b.js, 17, 15))
+
+    b = 2
+>b : Symbol(C.b, Decl(b.js, 18, 19))
+
+    \u0069n() {}
+>\u0069n : Symbol(C[\u0069n], Decl(b.js, 19, 9))
+}
+
+class D {
+>D : Symbol(D, Decl(b.js, 21, 1))
+
+    a = "a"
+>a : Symbol(D.a, Decl(b.js, 23, 9))
+
+    in
+    { a: 1 }
+>a : Symbol(a, Decl(b.js, 26, 5))
+
+    b = {}
+>b : Symbol(D.b, Decl(b.js, 26, 12))
+
+    instanceof
+    Object
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+}
+
+class E {
+>E : Symbol(E, Decl(b.js, 30, 1))
+
+    a = 1;
+>a : Symbol(E.a, Decl(b.js, 32, 9))
+
+    \u0069n = 2;
+>\u0069n : Symbol(E[\u0069n], Decl(b.js, 33, 10))
+
+    b = 3;
+>b : Symbol(E.b, Decl(b.js, 34, 16))
+
+    \u{69}nstanceof = 4;
+>\u{69}nstanceof : Symbol(E[\u{69}nstanceof], Decl(b.js, 35, 10))
+}
+
+const a = Object.keys(new A());
+>a : Symbol(a, Decl(b.js, 39, 5))
+>Object.keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>A : Symbol(A, Decl(b.js, 0, 10))
+
+const b = Object.keys(new B());
+>b : Symbol(b, Decl(b.js, 40, 5))
+>Object.keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>keys : Symbol(ObjectConstructor.keys, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>B : Symbol(B, Decl(b.js, 7, 1))
+
+const c = new C();
+>c : Symbol(c, Decl(b.js, 41, 5))
+>C : Symbol(C, Decl(b.js, 14, 1))
+
+const d = new D();
+>d : Symbol(d, Decl(b.js, 42, 5))
+>D : Symbol(D, Decl(b.js, 21, 1))
+
+const e = 1;
+>e : Symbol(e, Decl(b.js, 43, 5))
+
+const f = \u0065
+>f : Symbol(f, Decl(b.js, 44, 5))
+>\u0065 : Symbol(e, Decl(b.js, 43, 5))
+
+    + 1;
+
+=== c.ts ===
+export {};
+
+const a = "a" \u0069n { a: 1 };
+>a : Symbol(a, Decl(c.ts, 2, 5))
+>a : Symbol(a, Decl(c.ts, 2, 23))
+
+const b = {} \u{69}nstanceof Object;
+>b : Symbol(b, Decl(c.ts, 3, 5))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+=== d.js ===
+export {};
+
+const a = "a" \u0069n { a: 1 };
+>a : Symbol(a, Decl(d.js, 2, 5))
+>a : Symbol(a, Decl(d.js, 2, 23))
+
+const b = {} \u{69}nstanceof Object;
+>b : Symbol(b, Decl(d.js, 3, 5))
+>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+=== e.ts ===
+export {};
+
+class A {
+>A : Symbol(A, Decl(e.ts, 0, 10))
+
+    #a;
+>#a : Symbol(A.#a, Decl(e.ts, 2, 9))
+
+    b = #a
+>b : Symbol(A.b, Decl(e.ts, 3, 7))
+
+    \u0069n
+>\u0069n : Symbol(A[\u0069n], Decl(e.ts, 4, 10))
+}
+
+=== f.js ===
+export {};
+
+class A {
+>A : Symbol(A, Decl(f.js, 0, 10))
+
+    #a;
+>#a : Symbol(A.#a, Decl(f.js, 2, 9))
+
+    b = #a
+>b : Symbol(A.b, Decl(f.js, 3, 7))
+
+    \u0069n
+>\u0069n : Symbol(A[\u0069n], Decl(f.js, 4, 10))
+}
+
+=== g.ts ===
+declare var x: any, y: any;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+\u0069n
+
+=== h.ts ===
+declare var x: any, y: any;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+\u{69}nstanceof y
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+=== i.ts ===
+declare var x: any, y: any;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+if (x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+    \u0069n y) {}
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+=== j.js ===
+var x, y;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+\u0069n
+
+=== k.js ===
+var x, y;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+\u{69}nstanceof y
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+=== l.js ===
+var x, y;
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
+if (x
+>x : Symbol(x, Decl(g.ts, 0, 11), Decl(h.ts, 0, 11), Decl(i.ts, 0, 11), Decl(j.js, 0, 3), Decl(k.js, 0, 3) ... and 1 more)
+
+    \u0069n y) {}
+>y : Symbol(y, Decl(g.ts, 0, 19), Decl(h.ts, 0, 19), Decl(i.ts, 0, 19), Decl(j.js, 0, 6), Decl(k.js, 0, 6) ... and 1 more)
+
diff --git a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.types b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.types
index 88b9de35e8ab7..0f612f9089224 100644
--- a/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.types
+++ b/tsc/testdata/baselines/reference/conformance/scannerUnicodeEscapeInKeyword2.types
@@ -77,3 +77,433 @@ const a = {def\u0061ult: 12}; // OK, `default` not in keyword position
 
 // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
 
+=== a.ts ===
+export {};
+
+class A {
+>A : A
+
+    a = 1
+>a : number
+>1 : 1
+
+    \u{69}n
+>\u{69}n : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u{69}nstanceof
+>\u{69}nstanceof : any
+}
+
+class B {
+>B : B
+
+    a = 1
+>a : number
+>1 : 1
+
+    \u0069n
+>\u0069n : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u0069nstanceof
+>\u0069nstanceof : any
+}
+
+class C {
+>C : C
+
+    a = () => 1
+>a : () => number
+>() => 1 : () => number
+>1 : 1
+
+    \u{69}nstanceof
+>\u{69}nstanceof : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u0069n() {}
+>\u0069n : () => void
+}
+
+class D {
+>D : D
+
+    a = "a"
+>a : boolean
+>"a"    in    { a: 1 } : boolean
+>"a" : "a"
+
+    in
+    { a: 1 }
+>{ a: 1 } : { a: number; }
+>a : number
+>1 : 1
+
+    b = {}
+>b : boolean
+>{}    instanceof    Object : boolean
+>{} : {}
+
+    instanceof
+    Object
+>Object : ObjectConstructor
+}
+
+class E {
+>E : E
+
+    a = 1;
+>a : number
+>1 : 1
+
+    \u0069n = 2;
+>\u0069n : number
+>2 : 2
+
+    b = 3;
+>b : number
+>3 : 3
+
+    \u{69}nstanceof = 4;
+>\u{69}nstanceof : number
+>4 : 4
+}
+
+const a = Object.keys(new A());
+>a : string[]
+>Object.keys(new A()) : string[]
+>Object.keys : { (o: object): string[]; (o: {}): string[]; }
+>Object : ObjectConstructor
+>keys : { (o: object): string[]; (o: {}): string[]; }
+>new A() : A
+>A : typeof A
+
+const b = Object.keys(new B());
+>b : string[]
+>Object.keys(new B()) : string[]
+>Object.keys : { (o: object): string[]; (o: {}): string[]; }
+>Object : ObjectConstructor
+>keys : { (o: object): string[]; (o: {}): string[]; }
+>new B() : B
+>B : typeof B
+
+const c = new C();
+>c : C
+>new C() : C
+>C : typeof C
+
+const d = new D();
+>d : D
+>new D() : D
+>D : typeof D
+
+const e = 1;
+>e : 1
+>1 : 1
+
+const f = \u0065
+>f : number
+>\u0065    + 1 : number
+>\u0065 : 1
+
+    + 1;
+>1 : 1
+
+=== b.js ===
+export {};
+
+class A {
+>A : A
+
+    a = 1
+>a : number
+>1 : 1
+
+    \u{69}n
+>\u{69}n : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u{69}nstanceof
+>\u{69}nstanceof : any
+}
+
+class B {
+>B : B
+
+    a = 1
+>a : number
+>1 : 1
+
+    \u0069n
+>\u0069n : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u0069nstanceof
+>\u0069nstanceof : any
+}
+
+class C {
+>C : C
+
+    a = () => 1
+>a : () => number
+>() => 1 : () => number
+>1 : 1
+
+    \u{69}nstanceof
+>\u{69}nstanceof : any
+
+    b = 2
+>b : number
+>2 : 2
+
+    \u0069n() {}
+>\u0069n : () => void
+}
+
+class D {
+>D : D
+
+    a = "a"
+>a : boolean
+>"a"    in    { a: 1 } : boolean
+>"a" : "a"
+
+    in
+    { a: 1 }
+>{ a: 1 } : { a: number; }
+>a : number
+>1 : 1
+
+    b = {}
+>b : boolean
+>{}    instanceof    Object : boolean
+>{} : {}
+
+    instanceof
+    Object
+>Object : ObjectConstructor
+}
+
+class E {
+>E : E
+
+    a = 1;
+>a : number
+>1 : 1
+
+    \u0069n = 2;
+>\u0069n : number
+>2 : 2
+
+    b = 3;
+>b : number
+>3 : 3
+
+    \u{69}nstanceof = 4;
+>\u{69}nstanceof : number
+>4 : 4
+}
+
+const a = Object.keys(new A());
+>a : string[]
+>Object.keys(new A()) : string[]
+>Object.keys : { (o: object): string[]; (o: {}): string[]; }
+>Object : ObjectConstructor
+>keys : { (o: object): string[]; (o: {}): string[]; }
+>new A() : A
+>A : typeof A
+
+const b = Object.keys(new B());
+>b : string[]
+>Object.keys(new B()) : string[]
+>Object.keys : { (o: object): string[]; (o: {}): string[]; }
+>Object : ObjectConstructor
+>keys : { (o: object): string[]; (o: {}): string[]; }
+>new B() : B
+>B : typeof B
+
+const c = new C();
+>c : C
+>new C() : C
+>C : typeof C
+
+const d = new D();
+>d : D
+>new D() : D
+>D : typeof D
+
+const e = 1;
+>e : 1
+>1 : 1
+
+const f = \u0065
+>f : number
+>\u0065    + 1 : number
+>\u0065 : 1
+
+    + 1;
+>1 : 1
+
+=== c.ts ===
+export {};
+
+const a = "a" \u0069n { a: 1 };
+>a : boolean
+>"a" \u0069n { a: 1 } : boolean
+>"a" : "a"
+>{ a: 1 } : { a: number; }
+>a : number
+>1 : 1
+
+const b = {} \u{69}nstanceof Object;
+>b : boolean
+>{} \u{69}nstanceof Object : boolean
+>{} : {}
+>Object : ObjectConstructor
+
+=== d.js ===
+export {};
+
+const a = "a" \u0069n { a: 1 };
+>a : boolean
+>"a" \u0069n { a: 1 } : boolean
+>"a" : "a"
+>{ a: 1 } : { a: number; }
+>a : number
+>1 : 1
+
+const b = {} \u{69}nstanceof Object;
+>b : boolean
+>{} \u{69}nstanceof Object : boolean
+>{} : {}
+>Object : ObjectConstructor
+
+=== e.ts ===
+export {};
+
+class A {
+>A : A
+
+    #a;
+>#a : any
+
+    b = #a
+>b : any
+
+    \u0069n
+>\u0069n : any
+}
+
+=== f.js ===
+export {};
+
+class A {
+>A : A
+
+    #a;
+>#a : any
+
+    b = #a
+>b : any
+
+    \u0069n
+>\u0069n : any
+}
+
+=== g.ts ===
+declare var x: any, y: any;
+>x : any
+>y : any
+
+x
+>x : any
+
+\u0069n
+>\u0069n : boolean
+> : any
+
+> : any
+
+=== h.ts ===
+declare var x: any, y: any;
+>x : any
+>y : any
+
+x
+>x : any
+
+\u{69}nstanceof y
+>\u{69}nstanceof y : boolean
+> : any
+>y : any
+
+=== i.ts ===
+declare var x: any, y: any;
+>x : any
+>y : any
+
+if (x
+>x : any
+
+    \u0069n y) {}
+>\u0069n y : boolean
+> : any
+>y : any
+
+=== j.js ===
+var x, y;
+>x : any
+>y : any
+
+x
+>x : any
+
+\u0069n
+>\u0069n : boolean
+> : any
+
+> : any
+
+=== k.js ===
+var x, y;
+>x : any
+>y : any
+
+x
+>x : any
+
+\u{69}nstanceof y
+>\u{69}nstanceof y : boolean
+> : any
+>y : any
+
+=== l.js ===
+var x, y;
+>x : any
+>y : any
+
+if (x
+>x : any
+
+    \u0069n y) {}
+>\u0069n y : boolean
+> : any
+>y : any
+
diff --git a/tsc/testdata/tests/cases/conformance/scanner/ecmascript5/scannerUnicodeEscapeInKeyword2.ts b/tsc/testdata/tests/cases/conformance/scanner/ecmascript5/scannerUnicodeEscapeInKeyword2.ts
index a92c22569dba2..37458fab26a1a 100644
--- a/tsc/testdata/tests/cases/conformance/scanner/ecmascript5/scannerUnicodeEscapeInKeyword2.ts
+++ b/tsc/testdata/tests/cases/conformance/scanner/ecmascript5/scannerUnicodeEscapeInKeyword2.ts
@@ -1,4 +1,7 @@
 // @target: esnext
+// @noImplicitAny: false
+// @checkJs: true
+// @outDir: out
 // @filename: file1.ts
 var \u0061wait = 12; // ok
 async function main() {
@@ -37,3 +40,159 @@ export {};
 
 const a = {def\u0061ult: 12}; // OK, `default` not in keyword position
 // chrome and jsc may still error on this, ref https://bugs.chromium.org/p/chromium/issues/detail?id=993000 and https://bugs.webkit.org/show_bug.cgi?id=200638
+
+// @filename: a.ts
+export {};
+
+class A {
+    a = 1
+    \u{69}n
+    b = 2
+    \u{69}nstanceof
+}
+
+class B {
+    a = 1
+    \u0069n
+    b = 2
+    \u0069nstanceof
+}
+
+class C {
+    a = () => 1
+    \u{69}nstanceof
+    b = 2
+    \u0069n() {}
+}
+
+class D {
+    a = "a"
+    in
+    { a: 1 }
+    b = {}
+    instanceof
+    Object
+}
+
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+
+// @filename: b.js
+export {};
+
+class A {
+    a = 1
+    \u{69}n
+    b = 2
+    \u{69}nstanceof
+}
+
+class B {
+    a = 1
+    \u0069n
+    b = 2
+    \u0069nstanceof
+}
+
+class C {
+    a = () => 1
+    \u{69}nstanceof
+    b = 2
+    \u0069n() {}
+}
+
+class D {
+    a = "a"
+    in
+    { a: 1 }
+    b = {}
+    instanceof
+    Object
+}
+
+class E {
+    a = 1;
+    \u0069n = 2;
+    b = 3;
+    \u{69}nstanceof = 4;
+}
+
+const a = Object.keys(new A());
+const b = Object.keys(new B());
+const c = new C();
+const d = new D();
+const e = 1;
+const f = \u0065
+    + 1;
+
+// @filename: c.ts
+export {};
+
+const a = "a" \u0069n { a: 1 };
+const b = {} \u{69}nstanceof Object;
+
+// @filename: d.js
+export {};
+
+const a = "a" \u0069n { a: 1 };
+const b = {} \u{69}nstanceof Object;
+
+// @filename: e.ts
+export {};
+
+class A {
+    #a;
+    b = #a
+    \u0069n
+}
+
+// @filename: f.js
+export {};
+
+class A {
+    #a;
+    b = #a
+    \u0069n
+}
+
+// @filename: g.ts
+declare var x: any, y: any;
+x
+\u0069n
+
+// @filename: h.ts
+declare var x: any, y: any;
+x
+\u{69}nstanceof y
+
+// @filename: i.ts
+declare var x: any, y: any;
+if (x
+    \u0069n y) {}
+
+// @filename: j.js
+var x, y;
+x
+\u0069n
+
+// @filename: k.js
+var x, y;
+x
+\u{69}nstanceof y
+
+// @filename: l.js
+var x, y;
+if (x
+    \u0069n y) {}