feat: enforce web vitals performance budgets
This commit is contained in:
donghyeon-ka
@@ -0,0 +1,18 @@
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{
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"schemaVersion": 1,
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"bundle": {
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"initialJsGzipBytes": 204800,
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"lazyChunkGzipBytes": 122880
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},
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"lab": {
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"lcpMs": 2500,
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"cls": 0.1,
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"namedInteractionMs": 200
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},
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"field": {
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"p75LcpMs": 2500,
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"p75Cls": 0.1,
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"p75InpMs": 200,
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"minimumEligibleSamples": null
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}
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}
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@@ -0,0 +1,5 @@
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{
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"schemaVersion": 1,
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"releaseId": "local-release",
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"samples": []
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}
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@@ -0,0 +1,34 @@
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{
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"$schema": "https://json-schema.org/draft/2020-12/schema",
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"$id": "ART-FE-FIELD-WEB-VITALS@1",
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"type": "object",
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"required": [
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"schemaVersion",
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"generatedAt",
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"window",
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"context",
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"metrics",
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"eligibility",
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"status",
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"passed"
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],
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"properties": {
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"schemaVersion": { "const": 1 },
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"generatedAt": { "type": "string", "format": "date-time" },
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"window": { "type": "object", "required": ["days", "start", "end"] },
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"context": {
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"type": "object",
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"required": ["source", "network", "routeAggregation", "releaseId"]
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},
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"metrics": { "type": "object" },
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"eligibility": {
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"type": "object",
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"required": ["consentRequired", "eligibleSamples", "minimumEligibleSamples"]
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},
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"status": {
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"enum": ["PASS", "FAIL_THRESHOLD", "FAIL_UNVERIFIED"]
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},
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"passed": { "type": "boolean" }
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},
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"additionalProperties": false
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}
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@@ -0,0 +1,30 @@
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{
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"$schema": "https://json-schema.org/draft/2020-12/schema",
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"$id": "ART-FE-LAB@1",
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"type": "object",
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"required": [
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"schemaVersion",
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"generatedAt",
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"context",
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"metrics",
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"thresholds",
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"fixtures",
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"passed"
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],
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"properties": {
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"schemaVersion": { "const": 1 },
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"generatedAt": { "type": "string", "format": "date-time" },
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"context": {
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"type": "object",
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"required": ["runner", "browser", "viewport", "network", "cpu", "cache", "build"]
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},
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"metrics": {
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"type": "object",
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"required": ["lcpMs", "cls", "namedInteractionMs"]
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},
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"thresholds": { "type": "object" },
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"fixtures": { "type": "array", "minItems": 2 },
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"passed": { "type": "boolean" }
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},
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"additionalProperties": false
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}
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@@ -0,0 +1,17 @@
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# Performance evidence contract
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Performance evidence is deliberately split by measurement context:
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- `bundle.json` records production build output and enforces initial JavaScript
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at 200 KiB gzip and every lazy chunk at 120 KiB gzip.
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- `lab.json` records Chromium/runner/viewport/network/CPU/cache/build context and
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enforces LCP 2.5 s, CLS 0.10, and the named route interaction at 200 ms.
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- `field-web-vitals.json` records consent-filtered, route-ID aggregated,
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release-specific production samples over 28 days and evaluates p75 LCP, CLS,
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and INP against 2.5 s, 0.10, and 200 ms.
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The field minimum eligible-sample threshold is intentionally unresolved until
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a privacy-approved telemetry baseline exists. Therefore the field command
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fails closed with `FAIL_UNVERIFIED` when run against the example input. Provide
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`FIELD_WEB_VITALS_INPUT` and a reviewed `MIN_ELIGIBLE_SAMPLES` only after that
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decision is recorded.
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+4
-1
@@ -33,7 +33,10 @@
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"check:registries": "node scripts/check-registries.mjs",
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"verify:compatibility": "node scripts/check-compatibility.mjs",
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"verify:release": "node scripts/verify-release.mjs",
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"verify:hosting-headers": "node scripts/verify-hosting-headers.mjs"
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"verify:hosting-headers": "node scripts/verify-hosting-headers.mjs",
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"check:bundle": "node scripts/generate-supply-chain.mjs && node scripts/check-bundle.mjs",
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"test:performance": "node scripts/test-performance.mjs",
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"collect:web-vitals-evidence": "node scripts/collect-web-vitals-evidence.mjs"
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},
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"dependencies": {
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"@tanstack/react-query": "5.101.4",
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@@ -0,0 +1,93 @@
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import { readFile, writeFile } from "node:fs/promises";
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import { evaluateBundleBudget } from "../src/application/policies/performance-budgets.js";
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const report =
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/** @type {{
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* outputs: Array<{ path: string, gzipBytes: number }>,
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* [key: string]: unknown
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* }} */ (
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JSON.parse(await readFile("artifacts/performance/bundle.json", "utf8"))
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);
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const viteManifest =
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/** @type {Record<string, { file: string, isEntry?: boolean }>} */ (
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JSON.parse(await readFile("dist/.vite/manifest.json", "utf8"))
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);
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const budgets =
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/** @type {{ initialJsGzipBytes: number, lazyChunkGzipBytes: number }} */ (
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JSON.parse(await readFile("config/performance/budgets.json", "utf8")).bundle
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);
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const outputByPath = new Map(
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report.outputs.map((output) => [output.path.replace(/^dist\//, ""), output]),
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);
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const initialFiles = new Set(
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Object.values(viteManifest)
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.filter((entry) => entry.isEntry)
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.map((entry) => entry.file),
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);
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const lazyFiles = new Set(
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Object.values(viteManifest)
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.filter((entry) => !entry.isEntry && entry.file.endsWith(".js"))
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.map((entry) => entry.file),
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);
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const initialJsGzipBytes = [...initialFiles].reduce(
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(total, file) => total + (outputByPath.get(file)?.gzipBytes ?? 0),
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0,
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);
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const lazyChunks = [...lazyFiles].map((file) => ({
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path: file,
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gzipBytes: outputByPath.get(file)?.gzipBytes ?? 0,
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}));
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const measurements = { initialJsGzipBytes, lazyChunks };
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const result = evaluateBundleBudget(measurements, budgets);
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const fixtures = [
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{
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name: "initial-js-over-budget",
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passed:
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!evaluateBundleBudget(
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{
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initialJsGzipBytes: budgets.initialJsGzipBytes + 1,
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lazyChunks: [],
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},
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budgets,
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).passed,
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},
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{
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name: "lazy-chunk-over-budget",
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passed:
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!evaluateBundleBudget(
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{
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initialJsGzipBytes: 0,
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lazyChunks: [
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{
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path: "fixture.js",
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gzipBytes: budgets.lazyChunkGzipBytes + 1,
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},
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],
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},
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budgets,
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).passed,
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},
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];
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const passed = result.passed && fixtures.every((fixture) => fixture.passed);
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const completedReport = {
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...report,
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measurements,
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thresholds: budgets,
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results: result,
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fixtures,
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passed,
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};
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await writeFile(
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"artifacts/performance/bundle.json",
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`${JSON.stringify(completedReport, null, 2)}\n`,
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);
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if (!passed) {
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process.stderr.write("Bundle budget exceeded.\n");
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process.exit(1);
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}
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process.stdout.write(
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`Bundle budget: PASS (initial JS ${initialJsGzipBytes} / ${budgets.initialJsGzipBytes} gzip bytes)\n`,
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);
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@@ -0,0 +1,102 @@
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import { mkdir, readFile, writeFile } from "node:fs/promises";
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import {
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evaluateFieldBudget,
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percentile75,
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} from "../src/application/policies/performance-budgets.js";
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const inputPath =
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process.env.FIELD_WEB_VITALS_INPUT ??
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"config/performance/field-input.example.json";
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const input =
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/** @type {{
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* releaseId: string,
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* samples: Array<{
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* timestamp: string,
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* consent: boolean,
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* releaseId: string,
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* routeId: string,
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* lcpMs: number,
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* cls: number,
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* inpMs: number
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* }>
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* }} */ (JSON.parse(await readFile(inputPath, "utf8")));
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const configured =
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/** @type {{
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* p75LcpMs: number,
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* p75Cls: number,
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* p75InpMs: number,
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* minimumEligibleSamples: number | null
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* }} */ (
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JSON.parse(await readFile("config/performance/budgets.json", "utf8")).field
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);
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const minimumEligibleSamples = process.env.MIN_ELIGIBLE_SAMPLES
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? Number(process.env.MIN_ELIGIBLE_SAMPLES)
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: configured.minimumEligibleSamples;
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const end = new Date();
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const start = new Date(end);
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start.setUTCDate(start.getUTCDate() - 28);
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const eligible = input.samples.filter((sample) => {
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const timestamp = new Date(sample.timestamp);
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return (
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sample.consent === true &&
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sample.releaseId === input.releaseId &&
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timestamp >= start &&
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timestamp <= end
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);
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});
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const metrics = {
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p75LcpMs: percentile75(eligible.map((sample) => sample.lcpMs)),
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p75Cls: percentile75(eligible.map((sample) => sample.cls)),
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p75InpMs: percentile75(eligible.map((sample) => sample.inpMs)),
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};
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const thresholds = { ...configured, minimumEligibleSamples };
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const result = evaluateFieldBudget(
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{ metrics, eligibleSamples: eligible.length },
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thresholds,
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);
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const routeSamples = Object.fromEntries(
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Object.entries(
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eligible.reduce(
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(counts, sample) => {
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counts[sample.routeId] = (counts[sample.routeId] ?? 0) + 1;
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return counts;
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},
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/** @type {Record<string, number>} */ ({}),
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),
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).sort(([left], [right]) => left.localeCompare(right)),
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);
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const report = {
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schemaVersion: 1,
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generatedAt: end.toISOString(),
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window: { days: 28, start: start.toISOString(), end: end.toISOString() },
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context: {
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source: inputPath,
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network: "production-real-user",
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routeAggregation: "route-id-only",
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releaseId: input.releaseId,
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},
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metrics,
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thresholds,
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eligibility: {
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consentRequired: true,
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eligibleSamples: eligible.length,
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minimumEligibleSamples,
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routeSamples,
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},
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status: result.status,
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passed: result.passed,
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};
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await mkdir("artifacts/performance", { recursive: true });
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await writeFile(
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"artifacts/performance/field-web-vitals.json",
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`${JSON.stringify(report, null, 2)}\n`,
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);
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if (!result.passed) {
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process.stderr.write(
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`Field Web Vitals: ${result.status} (minimum eligible sample threshold and 28-day production data are required)\n`,
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);
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process.exit(1);
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}
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process.stdout.write("Field Web Vitals: PASS\n");
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@@ -0,0 +1,148 @@
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import { spawn } from "node:child_process";
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import { mkdir, readFile, writeFile } from "node:fs/promises";
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import { performance } from "node:perf_hooks";
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import process from "node:process";
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import { chromium } from "@playwright/test";
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import { evaluateLabBudget } from "../src/application/policies/performance-budgets.js";
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const server = spawn(
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"corepack",
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["pnpm", "preview", "--host", "127.0.0.1", "--port", "4173"],
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{ stdio: "ignore" },
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);
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const baseUrl = "http://127.0.0.1:4173";
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async function waitForServer() {
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for (let attempt = 0; attempt < 50; attempt += 1) {
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try {
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const response = await fetch(baseUrl);
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if (response.ok) return;
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} catch {
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// The bounded retry loop handles startup races.
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}
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await new Promise((resolve) => setTimeout(resolve, 100));
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}
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throw new Error("Preview server did not become ready.");
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}
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try {
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await waitForServer();
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const release = JSON.parse(
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await readFile("dist/release-manifest.json", "utf8"),
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);
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const thresholds = JSON.parse(
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await readFile("config/performance/budgets.json", "utf8"),
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).lab;
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const browser = await chromium.launch();
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try {
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const context = await browser.newContext({
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viewport: { width: 1280, height: 720 },
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});
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const page = await context.newPage();
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const cdp = await context.newCDPSession(page);
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await cdp.send("Network.enable");
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await cdp.send("Network.emulateNetworkConditions", {
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offline: false,
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latency: 40,
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downloadThroughput: 200_000,
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uploadThroughput: 93_750,
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connectionType: "cellular4g",
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});
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await cdp.send("Emulation.setCPUThrottlingRate", { rate: 4 });
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await page.addInitScript(() => {
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const evidence = { lcpMs: 0, cls: 0 };
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/** @type {any} */ (window).__contractPerformance = evidence;
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new PerformanceObserver((list) => {
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for (const entry of list.getEntries()) evidence.lcpMs = entry.startTime;
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}).observe({ type: "largest-contentful-paint", buffered: true });
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new PerformanceObserver((list) => {
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for (const entry of list.getEntries()) {
|
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if (!(/** @type {any} */ (entry)).hadRecentInput) {
|
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evidence.cls += /** @type {any} */ (entry).value;
|
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}
|
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}
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}).observe({ type: "layout-shift", buffered: true });
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});
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await page.goto(baseUrl, { waitUntil: "networkidle" });
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const interactionStarted = performance.now();
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await page.getByRole("link", { name: "샘플 리소스" }).click();
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await page.getByRole("heading", { name: "세션이 필요합니다." }).waitFor();
|
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const namedInteractionMs = performance.now() - interactionStarted;
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const paint = await page.evaluate(
|
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() => /** @type {any} */ (window).__contractPerformance,
|
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);
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const contextMetadata = {
|
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runner: {
|
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platform: process.platform,
|
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architecture: process.arch,
|
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nodeVersion: process.version,
|
||||
},
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browser: { name: "chromium", version: await browser.version() },
|
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viewport: { width: 1280, height: 720 },
|
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network: {
|
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profile: "contract-fast-4g",
|
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latencyMs: 40,
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downloadBytesPerSecond: 200_000,
|
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uploadBytesPerSecond: 93_750,
|
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},
|
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cpu: { throttlingRate: 4 },
|
||||
cache: { state: "cold", isolation: "new-browser-context" },
|
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build: { buildId: release.buildId, releaseId: release.releaseId },
|
||||
};
|
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const metrics = {
|
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lcpMs: Math.round(paint.lcpMs),
|
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cls: Number(paint.cls.toFixed(4)),
|
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namedInteractionMs: Math.round(namedInteractionMs),
|
||||
};
|
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const result = evaluateLabBudget(
|
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{ context: contextMetadata, metrics },
|
||||
thresholds,
|
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);
|
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const fixtures = [
|
||||
{
|
||||
name: "missing-context",
|
||||
passed: !evaluateLabBudget({ metrics }, thresholds).passed,
|
||||
},
|
||||
{
|
||||
name: "lcp-over-threshold",
|
||||
passed: !evaluateLabBudget(
|
||||
{
|
||||
context: contextMetadata,
|
||||
metrics: { ...metrics, lcpMs: thresholds.lcpMs + 1 },
|
||||
},
|
||||
thresholds,
|
||||
).passed,
|
||||
},
|
||||
];
|
||||
const passed = result.passed && fixtures.every((fixture) => fixture.passed);
|
||||
await mkdir("artifacts/performance", { recursive: true });
|
||||
await writeFile(
|
||||
"artifacts/performance/lab.json",
|
||||
`${JSON.stringify(
|
||||
{
|
||||
schemaVersion: 1,
|
||||
generatedAt: new Date().toISOString(),
|
||||
context: contextMetadata,
|
||||
metrics,
|
||||
thresholds,
|
||||
fixtures,
|
||||
passed,
|
||||
},
|
||||
null,
|
||||
2,
|
||||
)}\n`,
|
||||
);
|
||||
if (!passed) {
|
||||
throw new Error(`Lab performance failed: ${JSON.stringify(metrics)}`);
|
||||
}
|
||||
process.stdout.write(
|
||||
`Lab performance: PASS (LCP ${metrics.lcpMs}ms, CLS ${metrics.cls}, interaction ${metrics.namedInteractionMs}ms)\n`,
|
||||
);
|
||||
} finally {
|
||||
await browser.close();
|
||||
}
|
||||
} finally {
|
||||
server.kill("SIGTERM");
|
||||
}
|
||||
@@ -0,0 +1,96 @@
|
||||
/**
|
||||
* @param {{
|
||||
* initialJsGzipBytes: number,
|
||||
* lazyChunks: Array<{ path: string, gzipBytes: number }>
|
||||
* }} measurements
|
||||
* @param {{ initialJsGzipBytes: number, lazyChunkGzipBytes: number }} thresholds
|
||||
*/
|
||||
export function evaluateBundleBudget(measurements, thresholds) {
|
||||
const initialPassed =
|
||||
measurements.initialJsGzipBytes <= thresholds.initialJsGzipBytes;
|
||||
const lazyResults = measurements.lazyChunks.map((chunk) => ({
|
||||
...chunk,
|
||||
threshold: thresholds.lazyChunkGzipBytes,
|
||||
passed: chunk.gzipBytes <= thresholds.lazyChunkGzipBytes,
|
||||
}));
|
||||
return Object.freeze({
|
||||
initialPassed,
|
||||
lazyResults: Object.freeze(lazyResults),
|
||||
passed: initialPassed && lazyResults.every((chunk) => chunk.passed),
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {{
|
||||
* context?: Record<string, unknown>,
|
||||
* metrics: { lcpMs: number, cls: number, namedInteractionMs: number }
|
||||
* }} report
|
||||
* @param {{ lcpMs: number, cls: number, namedInteractionMs: number }} thresholds
|
||||
*/
|
||||
export function evaluateLabBudget(report, thresholds) {
|
||||
const requiredContext = [
|
||||
"runner",
|
||||
"browser",
|
||||
"viewport",
|
||||
"network",
|
||||
"cpu",
|
||||
"cache",
|
||||
"build",
|
||||
];
|
||||
const missingContext = requiredContext.filter(
|
||||
(field) => report.context?.[field] === undefined,
|
||||
);
|
||||
const results = {
|
||||
lcp: report.metrics.lcpMs <= thresholds.lcpMs,
|
||||
cls: report.metrics.cls <= thresholds.cls,
|
||||
namedInteraction:
|
||||
report.metrics.namedInteractionMs <= thresholds.namedInteractionMs,
|
||||
};
|
||||
return Object.freeze({
|
||||
missingContext: Object.freeze(missingContext),
|
||||
results: Object.freeze(results),
|
||||
passed: missingContext.length === 0 && Object.values(results).every(Boolean),
|
||||
});
|
||||
}
|
||||
|
||||
/** @param {number[]} values */
|
||||
export function percentile75(values) {
|
||||
if (values.length === 0) return null;
|
||||
const sorted = [...values].sort((left, right) => left - right);
|
||||
return sorted[Math.ceil(sorted.length * 0.75) - 1];
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {{
|
||||
* metrics: { p75LcpMs: number | null, p75Cls: number | null, p75InpMs: number | null },
|
||||
* eligibleSamples: number
|
||||
* }} report
|
||||
* @param {{
|
||||
* p75LcpMs: number,
|
||||
* p75Cls: number,
|
||||
* p75InpMs: number,
|
||||
* minimumEligibleSamples: number | null
|
||||
* }} thresholds
|
||||
*/
|
||||
export function evaluateFieldBudget(report, thresholds) {
|
||||
if (
|
||||
thresholds.minimumEligibleSamples === null ||
|
||||
report.eligibleSamples < thresholds.minimumEligibleSamples ||
|
||||
Object.values(report.metrics).some((value) => value === null)
|
||||
) {
|
||||
return Object.freeze({
|
||||
status: /** @type {const} */ ("FAIL_UNVERIFIED"),
|
||||
passed: false,
|
||||
});
|
||||
}
|
||||
const passed =
|
||||
/** @type {number} */ (report.metrics.p75LcpMs) <= thresholds.p75LcpMs &&
|
||||
/** @type {number} */ (report.metrics.p75Cls) <= thresholds.p75Cls &&
|
||||
/** @type {number} */ (report.metrics.p75InpMs) <= thresholds.p75InpMs;
|
||||
return Object.freeze({
|
||||
status: passed
|
||||
? /** @type {const} */ ("PASS")
|
||||
: /** @type {const} */ ("FAIL_THRESHOLD"),
|
||||
passed,
|
||||
});
|
||||
}
|
||||
@@ -0,0 +1,77 @@
|
||||
import { describe, expect, it } from "vitest";
|
||||
|
||||
import {
|
||||
evaluateBundleBudget,
|
||||
evaluateFieldBudget,
|
||||
evaluateLabBudget,
|
||||
percentile75,
|
||||
} from "../../src/application/policies/performance-budgets.js";
|
||||
|
||||
describe("performance budgets", () => {
|
||||
it("rejects initial and lazy JavaScript above their named limits", () => {
|
||||
const thresholds = {
|
||||
initialJsGzipBytes: 200,
|
||||
lazyChunkGzipBytes: 120,
|
||||
};
|
||||
expect(
|
||||
evaluateBundleBudget(
|
||||
{ initialJsGzipBytes: 201, lazyChunks: [] },
|
||||
thresholds,
|
||||
).passed,
|
||||
).toBe(false);
|
||||
expect(
|
||||
evaluateBundleBudget(
|
||||
{
|
||||
initialJsGzipBytes: 100,
|
||||
lazyChunks: [{ path: "lazy.js", gzipBytes: 121 }],
|
||||
},
|
||||
thresholds,
|
||||
).passed,
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("fails lab evidence when context is absent or a metric is over budget", () => {
|
||||
const thresholds = { lcpMs: 2500, cls: 0.1, namedInteractionMs: 200 };
|
||||
expect(
|
||||
evaluateLabBudget(
|
||||
{ metrics: { lcpMs: 1000, cls: 0, namedInteractionMs: 50 } },
|
||||
thresholds,
|
||||
),
|
||||
).toMatchObject({ passed: false });
|
||||
expect(
|
||||
evaluateLabBudget(
|
||||
{
|
||||
context: {
|
||||
runner: {},
|
||||
browser: {},
|
||||
viewport: {},
|
||||
network: {},
|
||||
cpu: {},
|
||||
cache: {},
|
||||
build: {},
|
||||
},
|
||||
metrics: { lcpMs: 2501, cls: 0, namedInteractionMs: 50 },
|
||||
},
|
||||
thresholds,
|
||||
).passed,
|
||||
).toBe(false);
|
||||
});
|
||||
|
||||
it("uses the nearest-rank p75 and fails closed while sample minimum is deferred", () => {
|
||||
expect(percentile75([4, 1, 3, 2])).toBe(3);
|
||||
expect(
|
||||
evaluateFieldBudget(
|
||||
{
|
||||
metrics: { p75LcpMs: 1000, p75Cls: 0.01, p75InpMs: 50 },
|
||||
eligibleSamples: 100,
|
||||
},
|
||||
{
|
||||
p75LcpMs: 2500,
|
||||
p75Cls: 0.1,
|
||||
p75InpMs: 200,
|
||||
minimumEligibleSamples: null,
|
||||
},
|
||||
),
|
||||
).toEqual({ status: "FAIL_UNVERIFIED", passed: false });
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user