diff --git a/tests/baselines/reference/declFileFunctions.js b/tests/baselines/reference/declFileFunctions.js
index da1917163e1..d3debf4d50c 100644
--- a/tests/baselines/reference/declFileFunctions.js
+++ b/tests/baselines/reference/declFileFunctions.js
@@ -26,6 +26,10 @@ export function fooWithSingleOverload(a: any) {
     return a;
 }
 
+export function fooWithTypePredicate(a: any): a is number {
+    return true;
+}
+
 /** This comment should appear for nonExportedFoo*/
 function nonExportedFoo() {
 }
@@ -92,6 +96,10 @@ function fooWithSingleOverload(a) {
     return a;
 }
 exports.fooWithSingleOverload = fooWithSingleOverload;
+function fooWithTypePredicate(a) {
+    return true;
+}
+exports.fooWithTypePredicate = fooWithTypePredicate;
 /** This comment should appear for nonExportedFoo*/
 function nonExportedFoo() {
 }
@@ -144,6 +152,7 @@ export declare function fooWithRestParameters(a: string, ...rests: string[]): st
 export declare function fooWithOverloads(a: string): string;
 export declare function fooWithOverloads(a: number): number;
 export declare function fooWithSingleOverload(a: string): string;
+export declare function fooWithTypePredicate(a: any): a is number;
 //// [declFileFunctions_1.d.ts]
 /** This comment should appear for foo*/
 declare function globalfoo(): void;
diff --git a/tests/baselines/reference/declFileFunctions.symbols b/tests/baselines/reference/declFileFunctions.symbols
index ff04d211557..1d62cc29d28 100644
--- a/tests/baselines/reference/declFileFunctions.symbols
+++ b/tests/baselines/reference/declFileFunctions.symbols
@@ -57,49 +57,57 @@ export function fooWithSingleOverload(a: any) {
 >a : Symbol(a, Decl(declFileFunctions_0.ts, 21, 38))
 }
 
+export function fooWithTypePredicate(a: any): a is number {
+>fooWithTypePredicate : Symbol(fooWithTypePredicate, Decl(declFileFunctions_0.ts, 23, 1))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 25, 37))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 25, 37))
+
+    return true;
+}
+
 /** This comment should appear for nonExportedFoo*/
 function nonExportedFoo() {
->nonExportedFoo : Symbol(nonExportedFoo, Decl(declFileFunctions_0.ts, 23, 1))
+>nonExportedFoo : Symbol(nonExportedFoo, Decl(declFileFunctions_0.ts, 27, 1))
 }
 /** This is comment for function signature*/
 function nonExportedFooWithParameters(/** this is comment about a*/a: string,
->nonExportedFooWithParameters : Symbol(nonExportedFooWithParameters, Decl(declFileFunctions_0.ts, 27, 1))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 29, 38))
+>nonExportedFooWithParameters : Symbol(nonExportedFooWithParameters, Decl(declFileFunctions_0.ts, 31, 1))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 33, 38))
 
     /** this is comment for b*/
     b: number) {
->b : Symbol(b, Decl(declFileFunctions_0.ts, 29, 77))
+>b : Symbol(b, Decl(declFileFunctions_0.ts, 33, 77))
 
     var d = a;
->d : Symbol(d, Decl(declFileFunctions_0.ts, 32, 7))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 29, 38))
+>d : Symbol(d, Decl(declFileFunctions_0.ts, 36, 7))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 33, 38))
 }
 function nonExportedFooWithRestParameters(a: string, ...rests: string[]) {
->nonExportedFooWithRestParameters : Symbol(nonExportedFooWithRestParameters, Decl(declFileFunctions_0.ts, 33, 1))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 34, 42))
->rests : Symbol(rests, Decl(declFileFunctions_0.ts, 34, 52))
+>nonExportedFooWithRestParameters : Symbol(nonExportedFooWithRestParameters, Decl(declFileFunctions_0.ts, 37, 1))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 38, 42))
+>rests : Symbol(rests, Decl(declFileFunctions_0.ts, 38, 52))
 
     return a + rests.join("");
->a : Symbol(a, Decl(declFileFunctions_0.ts, 34, 42))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 38, 42))
 >rests.join : Symbol(Array.join, Decl(lib.d.ts, 1035, 31))
->rests : Symbol(rests, Decl(declFileFunctions_0.ts, 34, 52))
+>rests : Symbol(rests, Decl(declFileFunctions_0.ts, 38, 52))
 >join : Symbol(Array.join, Decl(lib.d.ts, 1035, 31))
 }
 
 function nonExportedFooWithOverloads(a: string): string;
->nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 36, 1), Decl(declFileFunctions_0.ts, 38, 56), Decl(declFileFunctions_0.ts, 39, 56))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 38, 37))
+>nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 40, 1), Decl(declFileFunctions_0.ts, 42, 56), Decl(declFileFunctions_0.ts, 43, 56))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 42, 37))
 
 function nonExportedFooWithOverloads(a: number): number;
->nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 36, 1), Decl(declFileFunctions_0.ts, 38, 56), Decl(declFileFunctions_0.ts, 39, 56))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 39, 37))
+>nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 40, 1), Decl(declFileFunctions_0.ts, 42, 56), Decl(declFileFunctions_0.ts, 43, 56))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 43, 37))
 
 function nonExportedFooWithOverloads(a: any): any {
->nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 36, 1), Decl(declFileFunctions_0.ts, 38, 56), Decl(declFileFunctions_0.ts, 39, 56))
->a : Symbol(a, Decl(declFileFunctions_0.ts, 40, 37))
+>nonExportedFooWithOverloads : Symbol(nonExportedFooWithOverloads, Decl(declFileFunctions_0.ts, 40, 1), Decl(declFileFunctions_0.ts, 42, 56), Decl(declFileFunctions_0.ts, 43, 56))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 44, 37))
 
     return a;
->a : Symbol(a, Decl(declFileFunctions_0.ts, 40, 37))
+>a : Symbol(a, Decl(declFileFunctions_0.ts, 44, 37))
 }
 
 === tests/cases/compiler/declFileFunctions_1.ts ===
diff --git a/tests/baselines/reference/declFileFunctions.types b/tests/baselines/reference/declFileFunctions.types
index b9e94f7ffcd..e6ecc53b043 100644
--- a/tests/baselines/reference/declFileFunctions.types
+++ b/tests/baselines/reference/declFileFunctions.types
@@ -60,6 +60,15 @@ export function fooWithSingleOverload(a: any) {
 >a : any
 }
 
+export function fooWithTypePredicate(a: any): a is number {
+>fooWithTypePredicate : (a: any) => boolean
+>a : any
+>a : any
+
+    return true;
+>true : boolean
+}
+
 /** This comment should appear for nonExportedFoo*/
 function nonExportedFoo() {
 >nonExportedFoo : () => void