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Neil
e9d9d42ccc
* perf: find mobile Markdown placeholder prefixes in one scan * style: format mobile Markdown benchmark guard * docs: explain collision-free Markdown prefix length
59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
import assert from 'node:assert/strict'
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import { execFileSync } from 'node:child_process'
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import { readFileSync } from 'node:fs'
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import { dirname, resolve } from 'node:path'
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import { performance } from 'node:perf_hooks'
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import { build } from 'esbuild'
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const sourcePath = 'mobile/src/components/mobile-markdown-preview-html.ts'
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const baselineRef = process.argv[2]
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if (!baselineRef) {
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throw new Error(
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'Usage: node config/scripts/mobile-markdown-placeholder-benchmark.mjs <baseline-ref>'
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)
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}
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async function load(source) {
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const result = await build({
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stdin: { contents: source, resolveDir: dirname(resolve(sourcePath)), loader: 'ts' },
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bundle: true,
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write: false,
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platform: 'node',
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format: 'esm'
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})
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return (
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await import(
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`data:text/javascript;base64,${Buffer.from(result.outputFiles[0].text).toString('base64')}`
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)
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).normalizeMobileMarkdownPreviewHtml
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}
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const before = await load(
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execFileSync('git', ['show', `${baselineRef}:${sourcePath}`], { encoding: 'utf8' })
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)
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const after = await load(readFileSync(sourcePath, 'utf8'))
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function measure(fn, input, repeats) {
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const samples = []
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for (let run = 0; run < repeats; run++) {
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const start = performance.now()
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fn(input)
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samples.push(performance.now() - start)
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}
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return samples.sort((a, b) => a - b)[Math.floor(samples.length / 2)]
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}
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const results = []
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for (const [shape, input] of [
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['ordinary Markdown', '# Hello\n\n<p>Use `Array<string>` and <b>bold</b>.</p>'],
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...[2048, 8192, 16384].map((length) => [
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`${length} underscore collision`,
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`\uE000ORCA_MD_CODE_${'_'.repeat(length)}0\uE000 and \`Array<string>\``
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])
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]) {
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assert.equal(after(input), before(input))
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results.push({
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shape,
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bytes: Buffer.byteLength(input),
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beforeMs: measure(before, input, 5),
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afterMs: measure(after, input, 15)
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})
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}
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console.log(JSON.stringify({ node: process.version, platform: process.platform, results }, null, 2))
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