feat: cache dynamic path loaders

src/node/plugins/dynamicRoutesPlugin.ts

@@ -26,6 +26,8 @@ interface RouteModule {
   dependencies: string[]
 }
 
+const routeModuleCache = new Map<string, RouteModule>()
+
 export type ResolvedRouteConfig = UserRouteConfig & {
   /**
    * the raw route (relative to src root), e.g. foo/[bar].md
@@ -92,6 +94,7 @@ export const dynamicRoutesPlugin = async (
     },
 
     async handleHotUpdate(ctx) {
+      routeModuleCache.delete(ctx.file)
       const mods = config.dynamicRoutes.fileToModulesMap[ctx.file]
       if (mods) {
         // path loader module or deps updated, reset loaded routes
@@ -118,7 +121,7 @@ export async function resolveDynamicRoutes(
 
   for (const route of routes) {
     // locate corresponding route paths file
-    const fullPath = path.resolve(srcDir, route)
+    const fullPath = normalizePath(path.resolve(srcDir, route))
     const jsPathsFile = fullPath.replace(/\.md$/, '.paths.js')
     let pathsFile = jsPathsFile
     if (!fs.existsSync(jsPathsFile)) {
@@ -135,15 +138,17 @@ export async function resolveDynamicRoutes(
     }
 
     // load the paths loader module
-    let mod: RouteModule
+    let mod = routeModuleCache.get(pathsFile)
+    if (!mod) {
       try {
         mod = (await loadConfigFromFile({} as any, pathsFile)) as RouteModule
+        routeModuleCache.set(pathsFile, mod)
       } catch (e) {
         console.warn(`invalid paths file export in ${pathsFile}.`)
         continue
       }
+    }
 
-    if (mod) {
     // this array represents the virtual modules affected by this route
     const matchedModuleIds = (routeFileToModulesMap[
       normalizePath(path.resolve(srcDir, route))
@@ -153,12 +158,11 @@ export async function resolveDynamicRoutes(
     // same array
     for (const dep of mod.dependencies) {
       // deps are resolved relative to cwd
-        routeFileToModulesMap[normalizePath(path.resolve(dep))] =
+      routeFileToModulesMap[normalizePath(path.resolve(dep))] = matchedModuleIds
-          matchedModuleIds
     }
 
     const resolveRoute = async (): Promise<ResolvedRouteConfig[]> => {
-        const loader = mod.config.paths
+      const loader = mod!.config.paths
       const paths = await (typeof loader === 'function' ? loader() : loader)
       return paths.map((userConfig) => {
         const resolvedPath = route.replace(
@@ -175,7 +179,6 @@ export async function resolveDynamicRoutes(
     }
     pendingResolveRoutes.push(resolveRoute())
   }
-  }
 
   return {
     routes: (await Promise.all(pendingResolveRoutes)).flat(),