30 lines
1.7 KiB
JavaScript
30 lines
1.7 KiB
JavaScript
/* check-map-unmount-guard — the fast, browser-free half of the unmount-race proof (by gospel-plugin,
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adopted into internal/ by the studio lane; the end-to-end half is check-map-unmount-mid-init.mjs).
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Proves the guard by REPRODUCING the race against the real file: take the shipped source,
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run its ensureEngineCSS with a null element (what an unmounted pane hands it), and do the
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same against a copy with the guard stripped. One must throw, the other must not — a fix
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that cannot be shown to matter is not evidence. */
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import { readFileSync } from 'node:fs'
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const SRC = readFileSync('library/composables/useMapInstance.js', 'utf8')
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const grab = (src) => {
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const i = src.indexOf('async function ensureEngineCSS')
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const j = src.indexOf('\n}\n', i)
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return src.slice(i, j + 2)
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}
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const body = grab(SRC)
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const stripped = body.replace(' if (!element) return\n', '')
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if (stripped === body) { console.error('CONTROL BROKEN — the guard line was not found, so the negative arm proves nothing.'); process.exit(1) }
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const run = async (fnSrc) => {
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const f = new Function('ShadowRoot', `${fnSrc}; return ensureEngineCSS`)(class ShadowRoot {})
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try { await f(null, 'https://example.invalid/x.css'); return 'resolved' } catch (e) { return `threw: ${e.message}` }
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}
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const withGuard = await run(body)
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const without = await run(stripped)
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console.log(` guarded -> ${withGuard}`)
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console.log(` unguarded -> ${without}`)
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const ok = withGuard === 'resolved' && /getRootNode/.test(without)
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console.log(ok ? 'UNMOUNT-RACE: PASS — the guard turns studio\'s crash into a clean return.'
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: 'UNMOUNT-RACE: FAIL — the arms did not separate; this proves nothing.')
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process.exit(ok ? 0 : 1)
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