diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 9162dd3e19e..23b9c4e5de3 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5778,6 +5778,7 @@ namespace ts {
                     return getObjectFlags(typeToSerialize) & (ObjectFlags.Anonymous | ObjectFlags.Mapped) &&
                     !getIndexInfoOfType(typeToSerialize, IndexKind.String) &&
                     !getIndexInfoOfType(typeToSerialize, IndexKind.Number) &&
+                    !!(length(getPropertiesOfType(typeToSerialize)) || length(getSignaturesOfType(typeToSerialize, SignatureKind.Call))) &&
                     !length(getSignaturesOfType(typeToSerialize, SignatureKind.Construct)) && // TODO: could probably serialize as function + ns + class, now that that's OK
                     !getDeclarationWithTypeAnnotation(hostSymbol) &&
                     !(typeToSerialize.symbol && some(typeToSerialize.symbol.declarations, d => getSourceFileOfNode(d) !== ctxSrc)) &&
diff --git a/tests/baselines/reference/jsDeclarationsReactComponents.js b/tests/baselines/reference/jsDeclarationsReactComponents.js
index 1e5aaea30a4..025a96addda 100644
--- a/tests/baselines/reference/jsDeclarationsReactComponents.js
+++ b/tests/baselines/reference/jsDeclarationsReactComponents.js
@@ -75,8 +75,25 @@ TabbedShowLayout.defaultProps = {
     tabs: "default value"
 };
 
-export default TabbedShowLayout;
-
+export default TabbedShowLayout;
+//// [jsDeclarationsReactComponents5.jsx]
+import React from 'react';
+import PropTypes from 'prop-types';
+
+function Tree({ allowDropOnRoot }) {
+  return <div />
+}
+
+Tree.propTypes = {
+    classes: PropTypes.object,
+};
+
+Tree.defaultProps = {
+    classes: {},
+    parentSource: 'parent_id',
+};
+
+export default Tree;
 
 //// [jsDeclarationsReactComponents1.js]
 "use strict";
@@ -145,6 +162,26 @@ TabbedShowLayout.defaultProps = {
     tabs: "default value"
 };
 exports.default = TabbedShowLayout;
+//// [jsDeclarationsReactComponents5.js]
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+var react_1 = __importDefault(require("react"));
+var prop_types_1 = __importDefault(require("prop-types"));
+function Tree(_a) {
+    var allowDropOnRoot = _a.allowDropOnRoot;
+    return react_1.default.createElement("div", null);
+}
+Tree.propTypes = {
+    classes: prop_types_1.default.object,
+};
+Tree.defaultProps = {
+    classes: {},
+    parentSource: 'parent_id',
+};
+exports.default = Tree;
 
 
 //// [jsDeclarationsReactComponents1.d.ts]
@@ -190,3 +227,20 @@ declare namespace TabbedShowLayout {
         export const tabs: string;
     }
 }
+//// [jsDeclarationsReactComponents5.d.ts]
+/// <reference path="../..react16.d.ts" />
+export default Tree;
+declare function Tree({ allowDropOnRoot }: {
+    allowDropOnRoot: any;
+}): JSX.Element;
+declare namespace Tree {
+    export namespace propTypes {
+        export const classes: PropTypes.Requireable<object>;
+    }
+    export namespace defaultProps {
+        const classes_1: {};
+        export { classes_1 as classes };
+        export const parentSource: string;
+    }
+}
+import PropTypes from "prop-types";
diff --git a/tests/baselines/reference/jsDeclarationsReactComponents.symbols b/tests/baselines/reference/jsDeclarationsReactComponents.symbols
index 8534120b64d..43739a502a0 100644
--- a/tests/baselines/reference/jsDeclarationsReactComponents.symbols
+++ b/tests/baselines/reference/jsDeclarationsReactComponents.symbols
@@ -153,3 +153,47 @@ TabbedShowLayout.defaultProps = {
 export default TabbedShowLayout;
 >TabbedShowLayout : Symbol(TabbedShowLayout, Decl(jsDeclarationsReactComponents4.jsx, 1, 5), Decl(jsDeclarationsReactComponents4.jsx, 7, 2))
 
+=== tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents5.jsx ===
+import React from 'react';
+>React : Symbol(React, Decl(jsDeclarationsReactComponents5.jsx, 0, 6))
+
+import PropTypes from 'prop-types';
+>PropTypes : Symbol(PropTypes, Decl(jsDeclarationsReactComponents5.jsx, 1, 6))
+
+function Tree({ allowDropOnRoot }) {
+>Tree : Symbol(Tree, Decl(jsDeclarationsReactComponents5.jsx, 1, 35), Decl(jsDeclarationsReactComponents5.jsx, 5, 1), Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+>allowDropOnRoot : Symbol(allowDropOnRoot, Decl(jsDeclarationsReactComponents5.jsx, 3, 15))
+
+  return <div />
+>div : Symbol(JSX.IntrinsicElements.div, Decl(react16.d.ts, 2420, 114))
+}
+
+Tree.propTypes = {
+>Tree.propTypes : Symbol(Tree.propTypes, Decl(jsDeclarationsReactComponents5.jsx, 5, 1))
+>Tree : Symbol(Tree, Decl(jsDeclarationsReactComponents5.jsx, 1, 35), Decl(jsDeclarationsReactComponents5.jsx, 5, 1), Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+>propTypes : Symbol(Tree.propTypes, Decl(jsDeclarationsReactComponents5.jsx, 5, 1))
+
+    classes: PropTypes.object,
+>classes : Symbol(classes, Decl(jsDeclarationsReactComponents5.jsx, 7, 18))
+>PropTypes.object : Symbol(PropTypes.object, Decl(react16.d.ts, 65, 16))
+>PropTypes : Symbol(PropTypes, Decl(jsDeclarationsReactComponents5.jsx, 1, 6))
+>object : Symbol(PropTypes.object, Decl(react16.d.ts, 65, 16))
+
+};
+
+Tree.defaultProps = {
+>Tree.defaultProps : Symbol(Tree.defaultProps, Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+>Tree : Symbol(Tree, Decl(jsDeclarationsReactComponents5.jsx, 1, 35), Decl(jsDeclarationsReactComponents5.jsx, 5, 1), Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+>defaultProps : Symbol(Tree.defaultProps, Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+
+    classes: {},
+>classes : Symbol(classes, Decl(jsDeclarationsReactComponents5.jsx, 11, 21))
+
+    parentSource: 'parent_id',
+>parentSource : Symbol(parentSource, Decl(jsDeclarationsReactComponents5.jsx, 12, 16))
+
+};
+
+export default Tree;
+>Tree : Symbol(Tree, Decl(jsDeclarationsReactComponents5.jsx, 1, 35), Decl(jsDeclarationsReactComponents5.jsx, 5, 1), Decl(jsDeclarationsReactComponents5.jsx, 9, 2))
+
diff --git a/tests/baselines/reference/jsDeclarationsReactComponents.types b/tests/baselines/reference/jsDeclarationsReactComponents.types
index fe60f314cc7..260eedaff26 100644
--- a/tests/baselines/reference/jsDeclarationsReactComponents.types
+++ b/tests/baselines/reference/jsDeclarationsReactComponents.types
@@ -182,3 +182,54 @@ TabbedShowLayout.defaultProps = {
 export default TabbedShowLayout;
 >TabbedShowLayout : { (prop: { className: string; }): JSX.Element; defaultProps: { tabs: string; }; }
 
+=== tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents5.jsx ===
+import React from 'react';
+>React : typeof React
+
+import PropTypes from 'prop-types';
+>PropTypes : typeof PropTypes
+
+function Tree({ allowDropOnRoot }) {
+>Tree : typeof Tree
+>allowDropOnRoot : any
+
+  return <div />
+><div /> : JSX.Element
+>div : any
+}
+
+Tree.propTypes = {
+>Tree.propTypes = {    classes: PropTypes.object,} : { classes: PropTypes.Requireable<object>; }
+>Tree.propTypes : { classes: PropTypes.Requireable<object>; }
+>Tree : typeof Tree
+>propTypes : { classes: PropTypes.Requireable<object>; }
+>{    classes: PropTypes.object,} : { classes: PropTypes.Requireable<object>; }
+
+    classes: PropTypes.object,
+>classes : PropTypes.Requireable<object>
+>PropTypes.object : PropTypes.Requireable<object>
+>PropTypes : typeof PropTypes
+>object : PropTypes.Requireable<object>
+
+};
+
+Tree.defaultProps = {
+>Tree.defaultProps = {    classes: {},    parentSource: 'parent_id',} : { classes: {}; parentSource: string; }
+>Tree.defaultProps : { classes: {}; parentSource: string; }
+>Tree : typeof Tree
+>defaultProps : { classes: {}; parentSource: string; }
+>{    classes: {},    parentSource: 'parent_id',} : { classes: {}; parentSource: string; }
+
+    classes: {},
+>classes : {}
+>{} : {}
+
+    parentSource: 'parent_id',
+>parentSource : string
+>'parent_id' : "parent_id"
+
+};
+
+export default Tree;
+>Tree : typeof Tree
+
diff --git a/tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents.ts b/tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents.ts
index 4b598f83ef1..ce09708e9c4 100644
--- a/tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents.ts
+++ b/tests/cases/conformance/jsdoc/declarations/jsDeclarationsReactComponents.ts
@@ -83,3 +83,21 @@ TabbedShowLayout.defaultProps = {
 };
 
 export default TabbedShowLayout;
+// @filename: jsDeclarationsReactComponents5.jsx
+import React from 'react';
+import PropTypes from 'prop-types';
+
+function Tree({ allowDropOnRoot }) {
+  return <div />
+}
+
+Tree.propTypes = {
+    classes: PropTypes.object,
+};
+
+Tree.defaultProps = {
+    classes: {},
+    parentSource: 'parent_id',
+};
+
+export default Tree;
\ No newline at end of file