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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263// Copies the manifest's test262 directories from a local checkout into test/test262, verbatim.// Files needing unsupported flags, features, or harness includes, or whose code crosses one of the// interpreter's intentional boundaries, are not copied, so the vendored tree is exactly what// test/test262.test.ts runs.//// Usage: bun run script/sync-test262.ts /path/to/test262import path from "node:path"import { rm } from "node:fs/promises"
type Frontmatter = { flags?: Array<string>; features?: Array<string>; includes?: Array<string> }
const root = path.resolve(import.meta.dir, "../test/test262")const manifest = (await Bun.file(path.join(root, "manifest.json")).json()) as { revision: string directories: Array<string> harness: Array<string> flags: Array<string> features: Array<string> boundaries: Record<string, string>}const boundaries = Object.entries(manifest.boundaries).map(([name, pattern]) => [name, new RegExp(pattern)] as const)const checkout = process.argv[2]if (checkout === undefined) { console.error("usage: bun run script/sync-test262.ts /path/to/test262") process.exit(1)}const head = (await Bun.$`git -C ${checkout} rev-parse HEAD`.text()).trim()if (head !== manifest.revision) { console.error(`checkout is at ${head}; manifest pins ${manifest.revision}`) process.exit(1)}
const excluded = new Map<string, number>()let copied = 0for (const dir of manifest.directories) { await rm(path.join(root, dir), { recursive: true, force: true }) const from = path.join(checkout, "test", dir) for await (const file of new Bun.Glob("**/*.js").scan({ cwd: from })) { if (file.endsWith("_FIXTURE.js")) continue const source = await Bun.file(path.join(from, file)).text() const start = source.indexOf("/*---") const end = source.indexOf("---*/", start) const meta = start === -1 ? {} : (Bun.YAML.parse(source.slice(start + 5, end)) as Frontmatter) const code = start === -1 ? source : source.slice(end + 5) const reason = meta.flags?.find((flag) => manifest.flags.includes(flag)) ?? meta.features?.find((feature) => manifest.features.includes(feature)) ?? meta.includes?.find((include) => !manifest.harness.includes(include)) ?? boundaries.find(([, pattern]) => pattern.test(code))?.[0] if (reason !== undefined) { excluded.set(reason, (excluded.get(reason) ?? 0) + 1) continue } await Bun.write(path.join(root, dir, file), Bun.file(path.join(from, file))) copied++ }}
console.log(`copied ${copied} files`)for (const [reason, count] of [...excluded].sort((a, b) => b[1] - a[1])) { console.log(` excluded ${String(count).padStart(5)} ${reason}`)}