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fix(home): early boot reads load as an async data: script so stylesheets no longer hold them back (BUG-1127)

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An inline classic script after the stylesheets waited for them to download;
on staging the reads left at 2.4-3.1 s. Measurement script gains
--css-delay and --ua iphone.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE
This commit is contained in:
Jesse_Chen
2026-10-01 01:36:35 +08:00
co-authored by Claude Opus 5.5
parent 6e2f0af5a2
commit c2265dabb2
4 changed files with 47 additions and 6 deletions
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frontend/tests/home-first-load-20260930.test.tsx
+8 -2
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@@ -8,7 +8,7 @@ import { renderToStaticMarkup } from "react-dom/server";
import * as acorn from "acorn";
import { bindCurrentSubjectAccount, currentSubjectStorageKey, LAST_SUBJECT_ACCOUNT_KEY, readCurrentSubjectId, resetSubjectCatalogForTests } from "../src/lib/current-subject.ts";
import { BOOT_ACCOUNT_PATH, BOOT_CHART_PROFILES_PATH, BOOT_MODELS_PATH, BOOT_READ_INIT, BOOT_READ_MAX_AGE_MS, BOOT_READS_GLOBAL, bootEarlyReadsScript, bootSessionsPath, clearBootReads, takeBootRead, takeBootSessionsRead, withBootFallback } from "../src/lib/boot-early-reads.ts";
import { BOOT_ACCOUNT_PATH, BOOT_CHART_PROFILES_PATH, BOOT_MODELS_PATH, BOOT_READ_INIT, BOOT_READ_MAX_AGE_MS, BOOT_READS_GLOBAL, bootEarlyReadsScript, bootEarlyReadsScriptSrc, bootSessionsPath, clearBootReads, takeBootRead, takeBootSessionsRead, withBootFallback } from "../src/lib/boot-early-reads.ts";
import { chinaLocations } from "../src/data/china-locations.ts";
import { ensureChinaLocations, loadedChinaCountry, profileNeedsChinaLocations, resetChinaLocationsForTests } from "../src/lib/china-locations-client.ts";
import { readProfile, selectedBirthPlace } from "../src/lib/home-profile.ts";
@@ -233,7 +233,13 @@ test("the early-read script is classic ES5 and only acts on / (T8)", () => {
assert.deepEqual(runBootScript(path).sent, [], `${path} sends nothing`);
}
const layout = readFileSync(new URL("../src/app/layout.tsx", import.meta.url), "utf8");
assert.match(layout, /__html: bootEarlyReadsScript\(\)/);
// 原值：assert.match(layout, /__html: bootEarlyReadsScript\(\)/)（内联经典脚本）。
// 新值：<script async src={bootEarlyReadsScriptSrc()} />，src 是同一段脚本的 base64 data: URL。
// 原因：TASK-home-first-load-fix-20261001——内联脚本排在样式表之后，要等样式表下完才执行，线上早发推迟 2.4～3.1 s。
assert.match(layout, /<script async src=\{bootEarlyReadsScriptSrc\(\)\} \/>/);
const src = bootEarlyReadsScriptSrc();
assert.match(src, /^data:text\/javascript;base64,[A-Za-z0-9+/=]+$/);
assert.equal(Buffer.from(src.slice(src.indexOf(",") + 1), "base64").toString("utf8"), bootEarlyReadsScript(), "the data URL carries exactly the ES5 script");
});
test("the early reads are the normal requests, byte for byte (T8)", () => {