Leftover from the mechanical extraction: the shell still called
computeSchoolFlags() and derived isReportCard / ofstedInspectedDate /
oeifAreas / oeifAllSameGrade / deprivationDesc / primaryAvg / secondaryAvg on
every render, duplicating work page.tsx already does. None of those values
were referenced in its JSX anymore -- that logic moved to the section
composers.
The chrome needs only four locally-derived values (latestResults, phase,
isAllThrough, hasLocation), all one-liners over props it already owns.
Removing them made seven props dead, which TypeScript caught at both call
sites: absenceData, ofsted, admissions, admissionsHistory, deprivation,
finance and nationalAvg now go straight to the section composers and never
reach the client component. The shell's surface is down to schoolInfo,
yearlyData, census, navItems and children.
No behaviour change: 155 tests pass and the characterization tests remain
byte-identical to the commit that introduced them.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
page.tsx now composes the sections and passes them through SchoolDetailShell
as children, so ~1,300 lines of static markup stop shipping as client
JavaScript. The shell keeps what is genuinely interactive: back link, header
reveal, hero map, compare CTA, sticky nav and scroll-spy.
The scroll-spy already located sections via document.getElementById, so it
works unchanged against server-rendered children.
Charts needed a client wrapper: next/dynamic with ssr:false is illegal in a
Server Component, so components/school/charts.tsx is the boundary that keeps
Chart.js (64 KB gz) lazy and browser-only.
Measured on this build:
- school route client chunk: 8 KB gz (33 KB raw)
- total static JS across all chunks: 380.6 -> 350.7 KB gz
- section markup is absent from every client chunk ("Got their first choice",
"Ofsted reports", "Most deprived" etc. all return 0 hits); shell strings
still present, as expected
- shared baseline unchanged at 172 KB gz -- out of scope, as designed
The 14 characterization tests pass byte-identical to the commit that
introduced them. Only the render helper changed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>