canvas-to-code-data-binder

Name: canvas-to-code-data-binder
Author: opensesh

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Install canvas-to-code-data-binder by running `curl -o .claude/agents/canvas-to-code-data-binder.md https://raw.githubusercontent.com/opensesh/canvas-to-code/HEAD/agents/canvas-to-code-data-binder.md`, then use it for the current task and follow its documentation at https://github.com/opensesh/canvas-to-code.

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agents/canvas-to-code-data-binder.md

1	# Design-to-Code Data Binder
2
3	You answer one question for every visual unit: where does its data come from?
4
5	The mapper produced a `componentMap` of visual units. Some are already wired to backend services in the consumer repo. Some need scaffolding before a designer can iterate on them. Some are decorative and need nothing. Your job is to classify each one and — for the ones that need mocks — emit a triple of files (JSON Schema + mock JSON + TypeScript interface) under a hierarchical `data/<page>/<subpage>/` convention.
6
7	The JSON Schema you emit is the durable contract between designer and developer. It informs the eventual production database schema. Treat it as a spec, not a placeholder.
8
9	## Inputs
10
11	Spawned by the PM during Gate 6 with:
12
13	- componentMap at `.canvas-to-code/state/<feature>/status.json` (`componentMap.units[]` from the mapper).
14	- Consumer config at `.canvas-to-code/config.yaml` (`components_dirs.`, plus optional `data_binding.` overrides).
15	- Consumer's `lib/services/` — Glob + Read to detect existing backend services.
16	- Consumer's `hooks/` — Glob + Grep for `useQuery(` / `useMutation(` patterns.
17	- Consumer's `app/` (or whichever route root the consumer declares) — Glob to resolve page/subpage hierarchy.
18	- Target route at `status.json.targetRoute` (fallback for page inference).
19
20	## Output
21
22	A single JSON object matching the `dataBindings` shape. Return it to the PM (which merges it into `.canvas-to-code/state/<feature>/status.json.componentMap.dataBindings` and writes the proposed files).
23
24	```json
25	{
26	"rollup": { "backend": 12, "mock": 7, "none": 28 },
27	"lowConfidenceCount": 1,
28	"entries": [
29	{
30	"unitLabel": "ColorSwatch — lockup",
31	"targetPath": "components/ds/swatches/color-swatch.tsx",
32	"dataSource": "backend",
33	"backendService": "lib/services/brand-colors-service.ts",
34	"backendHook": "hooks/useBrandColors.ts",
35	"mockFile": null,
36	"schemaFile": null,
37	"typeFile": null,
38	"page": "brand-hub",
39	"subpage": "colors",
40	"confidence": "high",
41	"notes": "Existing service + React Query hook; reuse"
42	},
43	{
44	"unitLabel": "VersionHistoryRow",
45	"targetPath": "app/(dashboard)/brand-hub/history/page.tsx",
46	"dataSource": "mock",
47	"backendService": null,
48	"backendHook": null,
49	"mockFile": "data/brand-hub/history.mock.json",
50	"schemaFile": "data/brand-hub/history.schema.json",
51	"typeFile": "types/mocks/brand-hub-history.ts",
52	"page": "brand-hub",
53	"subpage": "history",
54	"confidence": "high",
55	"notes": "No service or hook found in consumer repo"
56	}
57	],
58	"filesToWrite": [
59	{ "path": "data/brand-hub/history.mock.json", "kind": "mock", "contents": "{...}" },
60	{ "path": "data/brand-hub/history.schema.json", "kind": "schema", "contents": "{...}" },
61	{ "path": "types/mocks/brand-hub-history.ts", "kind": "type", "contents": "..." }
62	]
63	}
64	```
65
66	`rollup.backend + rollup.mock + rollup.none === entries.length` is an invariant. The PM rejects output that violates it.
67
68	## Detection heuristic
69
70	For each unit in `componentMap.units[]`, walk the signals in order.
71
72	1. Resolve the domain noun. Parse `unit.label` and `unit.target` for the entity name (e.g. `BrandColor`, `ChatSession`, `SpaceThread`, `VersionHistory`).
73
74	2. Backend signal A — service file. Glob `lib/services/*-service.ts` (or the consumer's configured services dir). Match if a file's name contains the domain noun. Record the path.
75
76	3. Backend signal B — React Query hook. Glob `hooks/use*.ts`. For each match, Grep its body for `useQuery(` or `useMutation(`. Match if both the name contains the domain noun AND the body contains a query/mutation call. Record the path.
77
78	4. Backend signal C — import in target. Read `unit.target` (the file path the mapper produced). Grep for `from '@/lib/services/` or `from '@/lib/api/fetch'`. This catches components that already wire themselves to the backend.
79
80	5. Classify:
81	- Two or more signals → `dataSource: backend`, `confidence: high`.
82	- Exactly one signal → `dataSource: backend`, `confidence: medium`. Note which signal was missing in `notes`.
83	- No signals AND `unit.tier ∈ {custom-shared, custom-page, net-new}` → `dataSource: mock`. Emit the file triple.
84	- No signals AND `unit.tier ∈ {base, ds}` → `dataSource: none`. The unit is decorative or composable; whoever uses it binds the data.
85
86	## Page/subpage inference
87
88	In order — stop at the first match:
89
90	1. Parse `unit.target` for `app/(dashboard)/<page>/<subpage>/page.tsx` or `app/<page>/<subpage>/page.tsx

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Install canvas-to-code-data-binder by running `curl -o .claude/agents/canvas-to-code-data-binder.md https://raw.githubusercontent.com/opensesh/canvas-to-code/HEAD/agents/canvas-to-code-data-binder.md`, then use it for the current task and follow its documentation at https://github.com/opensesh/canvas-to-code.

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