feat: nix support for the nix folks (#3924)

Co-authored-by: opencode <opencode@sst.dev>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

nix/scripts/canonicalize-node-modules.ts

@@ -0,0 +1,94 @@
+import { lstat, mkdir, readdir, rm, symlink } from "fs/promises"
+import { join, relative } from "path"
+
+type SemverLike = {
+  valid: (value: string) => string | null
+  rcompare: (left: string, right: string) => number
+}
+
+type Entry = {
+  dir: string
+  version: string
+  label: string
+}
+
+const root = process.cwd()
+const bunRoot = join(root, "node_modules/.bun")
+const linkRoot = join(bunRoot, "node_modules")
+const directories = (await readdir(bunRoot)).sort()
+const versions = new Map<string, Entry[]>()
+
+for (const entry of directories) {
+  const full = join(bunRoot, entry)
+  const info = await lstat(full)
+  if (!info.isDirectory()) {
+    continue
+  }
+  const marker = entry.lastIndexOf("@")
+  if (marker <= 0) {
+    continue
+  }
+  const slug = entry.slice(0, marker).replace(/\+/g, "/")
+  const version = entry.slice(marker + 1)
+  const list = versions.get(slug) ?? []
+  list.push({ dir: full, version, label: entry })
+  versions.set(slug, list)
+}
+
+const semverModule = (await import(join(bunRoot, "node_modules/semver"))) as SemverLike | {
+  default: SemverLike
+}
+const semver = "default" in semverModule ? semverModule.default : semverModule
+const selections = new Map<string, Entry>()
+
+for (const [slug, list] of versions) {
+  list.sort((a, b) => {
+    const left = semver.valid(a.version)
+    const right = semver.valid(b.version)
+    if (left && right) {
+      const delta = semver.rcompare(left, right)
+      if (delta !== 0) {
+        return delta
+      }
+    }
+    if (left && !right) {
+      return -1
+    }
+    if (!left && right) {
+      return 1
+    }
+    return b.version.localeCompare(a.version)
+  })
+  selections.set(slug, list[0])
+}
+
+await rm(linkRoot, { recursive: true, force: true })
+await mkdir(linkRoot, { recursive: true })
+
+const rewrites: string[] = []
+
+for (const [slug, entry] of Array.from(selections.entries()).sort((a, b) => a[0].localeCompare(b[0]))) {
+  const parts = slug.split("/")
+  const leaf = parts.pop()
+  if (!leaf) {
+    continue
+  }
+  const parent = join(linkRoot, ...parts)
+  await mkdir(parent, { recursive: true })
+  const linkPath = join(parent, leaf)
+  const desired = join(entry.dir, "node_modules", slug)
+  const relativeTarget = relative(parent, desired)
+  const resolved = relativeTarget.length === 0 ? "." : relativeTarget
+  await rm(linkPath, { recursive: true, force: true })
+  await symlink(resolved, linkPath)
+  rewrites.push(slug + " -> " + resolved)
+}
+
+rewrites.sort()
+console.log("[canonicalize-node-modules] rebuilt", rewrites.length, "links")
+for (const line of rewrites.slice(0, 20)) {
+  console.log("  ", line)
+}
+if (rewrites.length > 20) {
+  console.log("  ...")
+}