Align with TPEN messaging contract — read siblings from TPEN_CONTEXT#3
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Replace the dedicated CANVASES boot message with the canonical lean TPEN_CONTEXT payload — sibling pages now arrive on the `siblings` field of TPEN_CONTEXT instead of a separate canvases-only message.
This was referenced May 8, 2026
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cubap
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May 8, 2026
| if (event.data.type === "TPEN_CONTEXT") { | ||
| try { | ||
| const canvases = event.data.canvases || [] | ||
| const canvases = event.data.siblings || [] |
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I'll need to check this... Does siblings include the current page?
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Yes — and renamed to canvases in cd4d134 to match the parent rename in CenterForDigitalHumanities/TPEN-interfaces#564. The active canvas is included so the dropdown can label 'you are here' (matches the legacy CANVASES shape this replaces).
Match parent rename in CenterForDigitalHumanities/TPEN-interfaces#564. Field shape unchanged. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Align Compare-Pages with the canonical TPEN messaging contract. Replace the legacy
CANVASESpayload withTPEN_CONTEXT.canvases. The full contract is defined in CenterForDigitalHumanities/TPEN-interfaces#564.Changes
iiif-image-viewer.jsTPEN_CONTEXTinstead ofCANVASES.event.data.canvases. Field shape is identical to the priorCANVASESpayload:{ id, label }per entry, whereidis the canvas IRI for that page — Compare-Pages already fetchesidas a IIIF canvas.Coordinated cut
Hard cut, all PRs must merge together. Full contract and other PRs:
Test plan
Developer-validated locally on 2026-05-08 against CenterForDigitalHumanities/TPEN-interfaces#564 on
:4000:jekyll s), add Compare-Pages to a project's tools. Open/transcribe.CANVASESconsumer)Companion follow-up (deferred, does not block this cut)
TPEN_CONTEXT.canvasesonly includes pages from the layer containing the active page, mirroring the legacyCANVASESshape that this PR replaces. Once the parent broadens to cross-layer, this PR's consumer picks it up automatically with no code change here.