generate() and edit() crash: outputComponents[0] is now designSystem, not screen data

[icebear0828]

Bug

Project.generate() and Screen.edit() crash with:

TypeError: Cannot read properties of undefined (reading 'screens')

Cause

The SDK hardcodes outputComponents[0].design.screens[0] to extract screen data from the API response. The Stitch API now returns designSystem at outputComponents[0] and the actual screen data at outputComponents[1]:

outputComponents[0] → { designSystem: { ... } }      // no .design property
outputComponents[1] → { design: { screens: [...] } }  // actual screen
outputComponents[2] → { text: "..." }
outputComponents[3..] → { suggestion: "..." }

This affects both generate_screen_from_text and edit_screens response handling.

Affected code

• domain-map.json: projection { "prop": "outputComponents", "index": 0 }
• Generated project.ts line 40: raw.outputComponents[0].design.screens[0]
• Generated screen.ts line 41: raw.outputComponents[0].design.screens[0]

Proposed fix

Replace the brittle index-based lookup with property-based lookup:

• Add find to ProjectionStep IR schema
• Emit .find((c) => c.design) instead of [0]

This makes the projection resilient to API response ordering changes.

Reproduction

const project = stitch.project("any-project-id");
const screen = await project.generate("A simple card");
// → TypeError: Cannot read properties of undefined (reading 'screens')

[icebear0828]

Investigation Update

The two APIs have different outputComponents structures:

API	design index	designSystem present
generate_screen_from_text	[1]	Yes, at [0]
edit_screens	[0]	No

The current domain-map.json uses index: 0 for both, which is correct for edit_screens but wrong for generate_screen_from_text.

Fix: Change generate_screen_from_text projection from index: 0 to index: 1. Leave edit_screens at index: 0.

Note: The SessionOutputComponent schema is a polymorphic type (design/designSystem/text/suggestion) with no ordering guarantee. If the API changes ordering again, the index will need updating.