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byrongamatosandClaude Opus 4.8
c295c1993d
static/js/resume-session.js (157) — the snapshot taken when you leave a song and the
pill that offers it back. Bodies VERBATIM. app.js 7,727 → 7,601.
Fifth slice out of the strongly-connected core. ONE hook (playSong) + a
currentFilename getter.
S.pendingResume JOINS THE CONTAINER — on demand, exactly as intended. app.js WRITES
it (playSong({ resume }) arms it; the song:ready listener consumes it) while this
module reads it, so it cannot be a plain export: an imported binding is read-only.
Same reason isPlaying is there. The container grows one field per carve that needs
it, never speculatively.
THE CONTRACT TEST CAUGHT THE MISSING HOOK, again on a path nothing executes:
"playSong is read by a module but never wired by app.js — it would throw at runtime".
Second time it has caught a real wiring gap the moment it appeared.
A REAL TRAP, worth remembering: I first did the S.pendingResume rewrite by feeding
acorn's identifier RANGES from node into python, and it corrupted the file
(`_pS.pendingResume null;`). **Acorn's offsets are UTF-16 code units; Python's string
indices are code points.** static/app.js contains emoji, so every offset past one
drifts. Do an AST-driven rewrite in the SAME language that produced the offsets.
`node --check` caught it; a silent version of that bug is very easy to imagine.
VERIFIED. A/B against origin/main in two browsers, real song: the window API
(resumeLastSession / _snapshotResumeSession / _readResumeSession /
_clearResumeSession), snapshot, read-back, and clear — IDENTICAL, zero page errors.
HONEST LIMIT: my probe never got the snapshot to actually PERSIST (there is a guard
beyond the 3s minimum position that a scripted playSong does not satisfy), so that
path is verified only as identical-to-main, not as observed-working. The real
coverage is tests/browser/resume-session.spec.ts, which drives the flow properly.
Zero harnesses broke. pytest 2396, node 1040/1040, ESLint 0 (no-cycle clean),
tailwind clean, Codex 0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
43 lines
2.1 KiB
JavaScript
43 lines
2.1 KiB
JavaScript
// Shared, MUTABLE player state.
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//
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// WHY A CONTAINER AND NOT PLAIN EXPORTS. An imported binding is read-only. Every
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// slice carved out of app.js so far has only ever READ the state it shares
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// (loopA/loopB, _audioSeekGen, currentFilename), so a getter hook was enough and no
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// container was needed. That runs out here: count-in genuinely WRITES `isPlaying`
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// (it starts and stops playback) and `lastAudioTime`. `import { isPlaying }` then
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// `isPlaying = true` throws — the binding cannot be assigned to.
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//
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// So the state moves onto an object. `S.isPlaying = true` is a property write, which
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// works from any module holding the same `S`. This is the same shape the stems,
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// studio, and editor migrations converged on.
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//
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// It is deliberately SMALL. app.js has ~104 top-level `let` scalars; lifting all of
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// them would be a ~977-site rewrite for no benefit, since most are private to one
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// cluster and travel with it. Only the ones a carved module must WRITE belong here.
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// Add to it when a carve actually needs it, not before.
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//
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// NB app.js's own 71 reference sites were rewritten mechanically — but from the AST,
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// not by text substitution. Of 100 textual occurrences of these two names, only 71
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// resolve to the module binding: 22 are member accesses (`someObj.isPlaying`), 4 are
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// the local parameter of setPlayButtonState(isPlaying), one is an object key, and two
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// are shorthand properties (`{ isPlaying }`) that must become `{ isPlaying: S.isPlaying }`.
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// A blind find-and-replace corrupts all 29.
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export const S = {
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/** Is the transport running? Written by playback, count-in, and the JUCE shims. */
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isPlaying: false,
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/**
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* The last audio position we saw, in seconds. Used to detect a seek that did not
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* land where it was asked to (JUCE can clamp; HTML5 can round).
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*/
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lastAudioTime: 0,
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/**
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* A resume request armed by playSong({ resume }) and consumed on song:ready.
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* Written by app.js (playSong, and the song:ready listener that consumes it) and
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* read by the resume-session module — so, like the two above, it cannot be a plain
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* export.
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*/
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pendingResume: null,
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};
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