Use class/function declaration name as displayName (closes #201)

Author: fkling

src/__tests__/__snapshots__/main-test.js.snap

@@ -62,6 +62,7 @@ Object {
 exports[`main fixtures processes component "component_4.js" without errors 1`] = `
 Object {
   "description": "",
+  "displayName": "Parent",
   "methods": Array [],
   "props": Object {
     "child": Object {
@@ -176,6 +177,7 @@ Object {
 exports[`main fixtures processes component "component_8.js" without errors 1`] = `
 Object {
   "description": "",
+  "displayName": "Parent",
   "methods": Array [
     Object {
       "docblock": null,
@@ -197,13 +199,15 @@ Object {
 exports[`main fixtures processes component "component_9.js" without errors 1`] = `
 Object {
   "description": "Should be recognized as component.",
+  "displayName": "ExampleComponent",
   "methods": Array [],
 }
 `;
 
 exports[`main fixtures processes component "component_10.js" without errors 1`] = `
 Object {
   "description": "React component that display current time at current location.",
+  "displayName": "Clock",
   "methods": Array [
     Object {
       "description": "Update clock state with new time",

src/handlers/__tests__/displayNameHandler-test.js

@@ -70,9 +70,28 @@ describe('defaultPropsHandler', () => {
     expect(documentation.displayName).not.toBeDefined();
   });
 
-  describe('ClassDeclaration displayName getter', () => {
+  describe('ClassDeclaration', () => {
 
-    it('considers class methods', () => {
+    it('considers the class name', () => {
+      const definition = statement(`
+        class Foo {
+        }
+      `);
+      expect(() => displayNameHandler(documentation, definition)).not.toThrow();
+      expect(documentation.displayName).toBe('Foo');
+    });
+
+    it('considers a static displayName class property', () => {
+      const definition = statement(`
+        class Foo {
+          static displayName = 'foo';
+        }
+      `);
+      expect(() => displayNameHandler(documentation, definition)).not.toThrow();
+      expect(documentation.displayName).toBe('foo');
+    });
+
+    it('considers static displayName getter', () => {
       const definition = statement(`
         class Foo {
           static get displayName() {
@@ -84,7 +103,7 @@ describe('defaultPropsHandler', () => {
       expect(documentation.displayName).toBe('foo');
     });
 
-    it('resolves variables in class methods', () => {
+    it('resolves variables in displayName getter', () => {
       const definition = statement(`
         class Foo {
           static get displayName() {

src/handlers/displayNameHandler.js

@@ -13,6 +13,7 @@
 import type Documentation from '../Documentation';
 
 import getMemberValuePath from '../utils/getMemberValuePath';
+import getNameOrValue from '../utils/getNameOrValue';
 import recast from 'recast';
 import resolveToValue from '../utils/resolveToValue';
 import {traverseShallow} from '../utils/traverse';
@@ -25,6 +26,14 @@ export default function displayNameHandler(
 ) {
   let displayNamePath = getMemberValuePath(path, 'displayName');
   if (!displayNamePath) {
+    // Function and class declarations need special treatment. The name of the
+    // function / class is the displayName
+    if (
+      types.ClassDeclaration.check(path.node) ||
+      types.FunctionDeclaration.check(path.node)
+    ) {
+      documentation.set('displayName', getNameOrValue(path.get('id')));
+    }
     return;
   }
   displayNamePath = resolveToValue(displayNamePath);