Merge pull request #26862 from storybookjs/yann/fix-docgen-convert-crash

Controls: Fix crashing when docgen extraction partially fails

code/lib/core-events/src/errors/preview-errors.test.ts

@@ -8,11 +8,22 @@ describe('UnknownFlowArgTypesError', () => {
       raw: "SomeType['someProperty']",
     };
 
-    const message = `"There was a failure when generating ArgTypes in Typescript for {"name":"signature","raw":"SomeType['someProperty']"}
-    This type is either not supported or it is a bug in Storybook.
-    If you think this is a bug, please open an issue in Github."`;
-
     const typeError = new UnknownArgTypesError({ type, language: 'Typescript' });
-    expect(typeError.message).toMatchInlineSnapshot(message);
+    expect(typeError.message).toMatchInlineSnapshot(`
+      "There was a failure when generating detailed ArgTypes in Typescript for:
+
+      {
+        "name": "signature",
+        "raw": "SomeType['someProperty']"
+      } 
+
+      Storybook will fall back to use a generic type description instead.
+
+      This type is either not supported or it is a bug in the docgen generation in Storybook.
+      If you think this is a bug, please detail it as much as possible in the Github issue.
+
+      More info: https://github.com/storybookjs/storybook/issues/26606
+      "
+    `);
   });
 });

code/lib/core-events/src/errors/preview-errors.ts

@@ -259,15 +259,22 @@ export class UnknownArgTypesError extends StorybookError {
 
   readonly code = 1;
 
+  readonly documentation = 'https://github.com/storybookjs/storybook/issues/26606';
+
   constructor(public data: { type: object; language: string }) {
     super();
   }
 
   template() {
-    return `There was a failure when generating ArgTypes in ${
+    return dedent`There was a failure when generating detailed ArgTypes in ${
       this.data.language
-    } for ${JSON.stringify(this.data.type)}
-    This type is either not supported or it is a bug in Storybook.
-    If you think this is a bug, please open an issue in Github.`;
+    } for:
+    
+    ${JSON.stringify(this.data.type, null, 2)} 
+    
+    Storybook will fall back to use a generic type description instead.
+
+    This type is either not supported or it is a bug in the docgen generation in Storybook.
+    If you think this is a bug, please detail it as much as possible in the Github issue.`;
   }
 }

code/lib/docs-tools/src/argTypes/convert/index.ts

@@ -7,9 +7,14 @@ import { convert as propTypesConvert } from './proptypes';
 
 export const convert = (docgenInfo: DocgenInfo) => {
   const { type, tsType, flowType } = docgenInfo;
-  if (type != null) return propTypesConvert(type);
-  if (tsType != null) return tsConvert(tsType as TSType);
-  if (flowType != null) return flowConvert(flowType as FlowType);
+  try {
+    if (type != null) return propTypesConvert(type);
+    if (tsType != null) return tsConvert(tsType as TSType);
+    if (flowType != null) return flowConvert(flowType as FlowType);
+  } catch (err) {
+    // if we can't convert the type, we'll just return null to fallback to a simple summary, and provide the error to the user
+    console.error(err);
+  }
 
   return null;
 };