diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 544b804e86536..87a72ea860f3b 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -4927,7 +4927,7 @@ export interface TypeCheckerHost extends ModuleSpecifierResolutionHost {
 
 export interface TypeChecker {
     getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
-    /** @internal */ getTypeOfSymbol(symbol: Symbol): Type;
+    getTypeOfSymbol(symbol: Symbol): Type;
     getDeclaredTypeOfSymbol(symbol: Symbol): Type;
     getPropertiesOfType(type: Type): Symbol[];
     getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
@@ -5153,9 +5153,21 @@ export interface TypeChecker {
     /** @internal */ getRecursionIdentity(type: Type): object | undefined;
     /** @internal */ getUnmatchedProperties(source: Type, target: Type, requireOptionalProperties: boolean, matchDiscriminantProperties: boolean): IterableIterator<Symbol>;
 
-    /** @internal */ isArrayType(type: Type): boolean;
-    /** @internal */ isTupleType(type: Type): boolean;
-    /** @internal */ isArrayLikeType(type: Type): boolean;
+    /**
+     * True if this type is the `Array` or `ReadonlyArray` type from lib.d.ts.
+     * This function will _not_ return true if passed a type which
+     * extends `Array` (for example, the TypeScript AST's `NodeArray` type).
+     */
+    isArrayType(type: Type): boolean;
+    /**
+     * True if this type is a tuple type. This function will _not_ return true if
+     * passed a type which extends from a tuple.
+     */
+    isTupleType(type: Type): boolean;
+    /**
+     * True if this type is assignable to `ReadonlyArray<any>`.
+     */
+    isArrayLikeType(type: Type): boolean;
 
     /**
      * True if `contextualType` should not be considered for completions because
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 65f9a35b41dc6..035abc4d7ff10 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -6310,6 +6310,7 @@ declare namespace ts {
     }
     interface TypeChecker {
         getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
+        getTypeOfSymbol(symbol: Symbol): Type;
         getDeclaredTypeOfSymbol(symbol: Symbol): Type;
         getPropertiesOfType(type: Type): Symbol[];
         getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
@@ -6400,6 +6401,21 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
+        /**
+         * True if this type is the `Array` or `ReadonlyArray` type from lib.d.ts.
+         * This function will _not_ return true if passed a type which
+         * extends `Array` (for example, the TypeScript AST's `NodeArray` type).
+         */
+        isArrayType(type: Type): boolean;
+        /**
+         * True if this type is a tuple type. This function will _not_ return true if
+         * passed a type which extends from a tuple.
+         */
+        isTupleType(type: Type): boolean;
+        /**
+         * True if this type is assignable to `ReadonlyArray<any>`.
+         */
+        isArrayLikeType(type: Type): boolean;
         getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
         /**
          * Depending on the operation performed, it may be appropriate to throw away the checker
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index e973a18179380..a8a5c3bb97f1b 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -2335,6 +2335,7 @@ declare namespace ts {
     }
     interface TypeChecker {
         getTypeOfSymbolAtLocation(symbol: Symbol, node: Node): Type;
+        getTypeOfSymbol(symbol: Symbol): Type;
         getDeclaredTypeOfSymbol(symbol: Symbol): Type;
         getPropertiesOfType(type: Type): Symbol[];
         getPropertyOfType(type: Type, propertyName: string): Symbol | undefined;
@@ -2425,6 +2426,21 @@ declare namespace ts {
         getApparentType(type: Type): Type;
         getBaseConstraintOfType(type: Type): Type | undefined;
         getDefaultFromTypeParameter(type: Type): Type | undefined;
+        /**
+         * True if this type is the `Array` or `ReadonlyArray` type from lib.d.ts.
+         * This function will _not_ return true if passed a type which
+         * extends `Array` (for example, the TypeScript AST's `NodeArray` type).
+         */
+        isArrayType(type: Type): boolean;
+        /**
+         * True if this type is a tuple type. This function will _not_ return true if
+         * passed a type which extends from a tuple.
+         */
+        isTupleType(type: Type): boolean;
+        /**
+         * True if this type is assignable to `ReadonlyArray<any>`.
+         */
+        isArrayLikeType(type: Type): boolean;
         getTypePredicateOfSignature(signature: Signature): TypePredicate | undefined;
         /**
          * Depending on the operation performed, it may be appropriate to throw away the checker