fix: incorrect typedef parsing for interfaces (#24192)

* fix: incorrect typedef parsing for interfaces

Wasn't finding typedefs for interfaces with the same name as the typed thing; e.g.

```ts
interface Foo {}
const Foo: Foo
```

Also adds a guard and more helpful error when unavoidable loops occur due to type naming

* test: add tests

packages/gatsby-transformer-documentationjs/src/__tests__/__snapshots__/gatsby-node.js.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`transformer-react-doc-gen: onCreateNode Complex example should handle members should handle type unions 1`] = `
+exports[`gatsby-transformer-documentationjs: onCreateNode Complex example should handle members should handle type unions 1`] = `
 Object {
   "elements": Array [
     Object {
@@ -18,7 +18,7 @@ Object {
 }
 `;
 
-exports[`transformer-react-doc-gen: onCreateNode Complex example should handle typedefs should handle type applications 1`] = `
+exports[`gatsby-transformer-documentationjs: onCreateNode Complex example should handle typedefs should handle type applications 1`] = `
 Object {
   "children": Array [
     "documentationJS documentationJS node_1 path #[{\\"name\\":\\"ObjectType\\",\\"kind\\":\\"typedef\\"}] line 12 path #[{\\"name\\":\\"ObjectType\\",\\"kind\\":\\"typedef\\"},{\\"fieldName\\":\\"properties\\",\\"fieldIndex\\":0}] line 3--DocumentationJSComponentDescription--comment.description",
@@ -52,12 +52,12 @@ Object {
 }
 `;
 
-exports[`transformer-react-doc-gen: onCreateNode Simple example should extract out a description, params, and examples: description content 1`] = `
+exports[`gatsby-transformer-documentationjs: onCreateNode Simple example should extract out a description, params, and examples: description content 1`] = `
 "A pretty cool jsdoc example
 "
 `;
 
-exports[`transformer-react-doc-gen: onCreateNode Simple example should extract out a description, params, and examples: example 1`] = `
+exports[`gatsby-transformer-documentationjs: onCreateNode Simple example should extract out a description, params, and examples: example 1`] = `
 Object {
   "description": "const apple = require('apple')
 apple()",
@@ -68,9 +68,9 @@ apple()",
 }
 `;
 
-exports[`transformer-react-doc-gen: onCreateNode Simple example should extract out a description, params, and examples: param description 1`] = `
+exports[`gatsby-transformer-documentationjs: onCreateNode Simple example should extract out a description, params, and examples: param description 1`] = `
 "A nice crispy apple
 "
 `;
 
-exports[`transformer-react-doc-gen: onCreateNode Simple example should extract out a description, params, and examples: param name 1`] = `"paramName"`;
+exports[`gatsby-transformer-documentationjs: onCreateNode Simple example should extract out a description, params, and examples: param name 1`] = `"paramName"`;

packages/gatsby-transformer-documentationjs/src/__tests__/fixtures/same-name.ts

@@ -0,0 +1,14 @@
+
+/**
+ * The actual type
+ */
+export declare interface Foo {
+  (props: any): JSX.Element | null;
+}
+
+/**
+ * The Main Thing here
+ */
+const Foo: Foo = () => null;
+
+

packages/gatsby-transformer-documentationjs/src/__tests__/gatsby-node.js

@@ -2,7 +2,7 @@ import groupBy from "lodash/groupBy"
 import path from "path"
 import gatsbyNode from "../gatsby-node"
 
-describe(`transformer-react-doc-gen: onCreateNode`, () => {
+describe(`gatsby-transformer-documentationjs: onCreateNode`, () => {
   let createdNodes, updatedNodes
   const createNodeId = jest.fn(id => id)
   const createContentDigest = jest.fn().mockReturnValue(`content-digest`)
@@ -361,4 +361,8 @@ describe(`transformer-react-doc-gen: onCreateNode`, () => {
       expect(createdNodes.length).toBeGreaterThan(0)
     })
   })
+
+  it(`doesn't cause a stack overflow for nodes of the same name`, () => {
+    expect(run(getFileNode(`same-name.ts`))).resolves.toBeUndefined()
+  })
 })

packages/gatsby-transformer-documentationjs/src/gatsby-node.js

@@ -218,18 +218,25 @@ exports.onCreateNode = async ({ node, actions, ...helpers }) => {
     const handledDocs = new WeakMap()
     const typeDefs = new Map()
 
-    const getNodeIDForType = typeName => {
+    const getNodeIDForType = (typeName, parent) => {
       if (typeDefs.has(typeName)) {
         return typeDefs.get(typeName)
       }
 
       const index = documentationJson.findIndex(
         docsJson =>
           docsJson.name === typeName &&
-          [`typedef`, `constant`].includes(docsJson.kind)
+          [`interface`, `typedef`, `constant`].includes(docsJson.kind)
       )
 
-      if (index !== -1) {
+      const isCycle = parent === documentationJson[index]
+      if (isCycle) {
+        helpers.reporter.warn(
+          `Unexpected cycle detected creating DocumentationJS nodes for file:\n\n\t${node.absolutePath}\n\nFor type: ${typeName}`
+        )
+      }
+
+      if (index !== -1 && !isCycle) {
         return prepareNodeForDocs(documentationJson[index], {
           commentNumber: index,
         }).node.id
@@ -238,21 +245,21 @@ exports.onCreateNode = async ({ node, actions, ...helpers }) => {
       return null
     }
 
-    const tryToAddTypeDef = type => {
+    const tryToAddTypeDef = (type, parent) => {
       if (type.applications) {
-        type.applications.forEach(tryToAddTypeDef)
+        type.applications.forEach(t => tryToAddTypeDef(t, parent))
       }
 
       if (type.expression) {
-        tryToAddTypeDef(type.expression)
+        tryToAddTypeDef(type.expression, parent)
       }
 
       if (type.elements) {
-        type.elements.forEach(tryToAddTypeDef)
+        type.elements.forEach(t => tryToAddTypeDef(t, parent))
       }
 
       if (type.type === `NameExpression` && type.name) {
-        type.typeDef___NODE = getNodeIDForType(type.name)
+        type.typeDef___NODE = getNodeIDForType(type.name, parent)
       }
     }
 
@@ -334,7 +341,7 @@ exports.onCreateNode = async ({ node, actions, ...helpers }) => {
           picked.type = picked.type.expression
         }
 
-        tryToAddTypeDef(picked.type)
+        tryToAddTypeDef(picked.type, docsJson)
       }
 
       const mdFields = [`description`, `deprecated`]