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TypeScript
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970import { createRequire } from "node:module"import { readFileSync } from "node:fs"import path from "node:path"import { fileURLToPath, pathToFileURL } from "node:url"import { Host } from "./host.js"import { localSource } from "./source.js"import { missingPackageTarget } from "./source.package.js"
let generation = Date.now()
export async function prepareSource(entrypoint: string, track: (file: string, directory?: boolean) => void) { const root = fileURLToPath(entrypoint) const files = new Set<string>() const visit = (file: string, search = "") => { if (file !== root && file.split(path.sep).includes("node_modules")) return if (search) delete require.cache[file + search] if (files.has(file)) return files.add(file) // Bun exposes ESM here too. Delete known keys even when absent: rejected // evaluations are not enumerable, but deletion still invalidates them. delete require.cache[file] track(file) if (!/\.[cm]?[jt]sx?$/.test(file)) return // Scan dependencies only; the normal runtime loader still owns compilation, // package resolution, import attributes, and error reporting. const imports = (() => { try { return new Bun.Transpiler({ loader: file.endsWith("tsx") ? "tsx" : file.endsWith("jsx") ? "jsx" : /\.[cm]?ts$/.test(file) ? "ts" : "js", target: "bun", }).scan(readFileSync(file, "utf8")).imports } catch { return [] } })() for (const item of imports) { const local = item.path.startsWith("./") || item.path.startsWith("../") ? new URL(item.path, pathToFileURL(file)) : localSource(item.path, path.dirname(file)) if (!local) { try { Bun.resolveSync(item.path, path.dirname(file)) } catch { const target = missingPackageTarget(item.path, file) if (target) track(target, true) } continue } const requested = fileURLToPath(local) // Resolving a workspace symlink can erase its node_modules boundary. if (requested.split(path.sep).includes("node_modules")) continue try { visit( item.kind === "require-call" ? createRequire(file).resolve(requested) : Bun.resolveSync(requested, path.dirname(file)), local.search, ) } catch { // A missing local dependency may appear on the next save. Leave its // actual failure (or optional fallback) to the native loader. track(path.dirname(requested), true) } } } visit(root) return { version: String(++generation), load: () => Host.load(entrypoint) }}