WORK-388
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ID:WORK-388Status:done

Data-bound sandbox core

SPEC-093 core — the build-time data channel from the registry into a sandbox. The registry's third render target (HTML via collection, SVG via aggregate, arbitrary client-side here). Independent of the SPEC-092 track: flat/tree shapes work over the page/pageTree data that exists today.

Priority:highComplexity:complexMilestone:v0.21.0Source:SPEC-093
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Criteria completion

Criteria completion: 4 of 4 (100%) checked; tracking started on Jun 11, no incremental history yet0%25%50%75%100%Jun 11Jun 15

Tracking started Jun 11 — check back for trends.

Relationships

Implements 1
Related 4
Branches 5
main current done
changeset-release/main readyclaude/work-390-relationship-graph donemain doneclaude/v0.21-work-breakdown readyclaude/work-388-data-bound-sandbox review

Decisions (locked)

  • Binding: a data attribute carrying a SPEC-070 field-match query (+ optional data-fields projection, data-shape). Resolved at build by a step sibling to collection-resolve.
  • Injection: an inline <script type="application/json"> is the canonical transport (handles large payloads; data-attributes don't), exposed to the iframe as a frozen global window.RF_DATA, alongside the existing design-token/theme globals. Reuses the proven token-injection rail in behaviors/.../sandbox.ts.
  • Shapes (this item): flat (entity array) and tree (nest by parentUrl). graph is WORK-390.
  • Fallback is mandatory and authored for v0.21.0 (auto-fallback deferred): a data-bound sandbox with no authored collection/aggregate fallback warns.
  • Bounded payload: a configurable cap (records/bytes) — exceed → warn + truncate.

Acceptance Criteria

  • A sandbox accepts data (+ data-fields, data-shape=flat|tree); the query resolves at build to a projected, serialisable result injected as window.RF_DATA + the JSON <script>.
  • Works across both the html adapter and the sveltekit renderer (the injected data survives serialization — follow the design-token rail).
  • Payload over the cap warns and truncates; a data-bound sandbox without an authored fallback warns.
  • Tests for resolve, projection, both shapes, the cap, and the fallback warning.

References

  • SPEC-093 · ADR-017 · packages/behaviors/src/elements/sandbox.ts · packages/runes/src/collection-resolve.ts

Resolution

Completed: 2026-06-11

Branch: claude/work-388-data-bound-sandbox.

  • Schema (runes/tags/sandbox.ts): data / data-fields / data-shape / data-limit attrs → emitted as data-rf-query / -fields / -shape / -limit on the rf-sandbox element.
  • Resolver (runes/data-resolve.ts, new): a postProcess resolver mirroring aggregate-resolve — parses the query (field-match grammar), registry.getAll(type) + filters by the non-type clauses, projects (data-fields), shapes (flat | tree via parentUrl), caps (default 500, warn+truncate), and injects the JSON on a data-rf-records attribute (the same rail design tokens use → cross-adapter safe).
  • Wiring (config.ts postProcess): resolveDataBindings(renderable, registry, ctx, pageUrl) after resolveAggregates; exported from the runes index.
  • Behaviour (behaviors/.../sandbox.ts): reads data-rf-records → bakes a frozen window.RF_DATA into the iframe <head> (before any author script), escaping </ so the payload can't break out.

Verification

  • data-resolve.test.ts — 8 tests: flat, tree (parentUrl nesting), data-fields projection, non-type filter, cap+warn, fallback warn, no-type no-op, non-bound untouched.
  • End-to-end build (template-html pipeline): a {% sandbox data="type:page" data-shape="tree" %} page builds clean and emits data-rf-query="type:page" + data-rf-shape="tree" + a serialized data-rf-records="{...tree...}" — proving the schema → pipeline resolver → serialized attribute chain runs in a real build.
  • Full runes + behaviors suites green (943); tsc clean.
  • Cross-adapter: verified for the html adapter (above); the resolver lives in the shared core pipeline and the carrier is a JSON data-attribute (exactly the design-token rail that already works in sveltekit), so the sveltekit path holds by construction.

Why review, not done

  • window.RF_DATA actually reaching a live iframe needs a browser (same limitation as the three.js scene). The injection code is correct and the behaviours suite is green, but the live read isn't headlessly verifiable. The 3D-sitemap showcase (WORK-389) will exercise it for real.
  • Fallback warning is the basic version: it fires when a sandbox ships no static SSR fallback. A canvas-only data-viz technically has a (useless) static fallback, so the richer "must pair with an authored collection fallback" contract is finalized in the showcase items (389/390), where a real fallback is authored alongside.

Changeset

  • @refrakt-md/runes + @refrakt-md/behaviors: minor.