perf(better-define): add resolve cache

packages/better-define/src/index.ts

@@ -50,9 +50,26 @@ export default createUnplugin<Options | undefined, false>(
  }
  }
 
+ const resolveCache = new Map<
+ string /* importer */,
+ Map<string /* id */, string /* result */>
+ >()
+
+ function withResolveCache(id: string, importer: string, result: string) {
+ if (!resolveCache.has(importer)) {
+ resolveCache.set(importer, new Map([[id, result]]))
+ return result
+ }
+ resolveCache.get(importer)!.set(id, result)
+ return result
+ }
+
  const RollupResolve =
  (ctx: PluginContext): ResolveTSFileIdImpl =>
  async (id, importer) => {
+ const cached = resolveCache.get(importer)?.get(id)
+ if (cached) return cached
+
  async function tryPkgEntry() {
  try {
  const pkgPath = (await ctx.resolve(`${id}/package.json`, importer))
@@ -81,20 +98,20 @@ export default createUnplugin<Options | undefined, false>(
 
  if (!id.startsWith('.')) {
  const entry = await tryPkgEntry()
- if (entry) return entry
+ if (entry) return withResolveCache(id, importer, entry)
  }
 
  let resolved = await tryResolve(id)
  if (!resolved) return
  if (existsSync(resolved)) {
  collectReferencedFile(importer, resolved)
- return resolved
+ return withResolveCache(id, importer, resolved)
  }
 
  resolved = await tryResolve(resolved)
  if (resolved && existsSync(resolved)) {
  collectReferencedFile(importer, resolved)
- return resolved
+ return withResolveCache(id, importer, resolved)
  }
  }