refactor(csv-loader): decouple reference resolution and module

generation

Extract reference resolution logic, type generation, and module
generation into dedicated modules to improve maintainability and
clean up the core loader.

src/csv-loader/rollup.ts

@@ -1,7 +1,7 @@
-import type { CsvLoaderOptions } from './loader.js';
-import { csvToModule } from './loader.js';
-import * as path from 'path';
-import * as fs from 'fs';
+import * as path from "path";
+import * as fs from "fs";
+import { csvToModule } from "./module-gen";
+import { CsvLoaderOptions } from "./types";
 
 export interface CsvRollupOptions extends CsvLoaderOptions {
   /** Include pattern for CSV files (default: /\.csv$/) */
@@ -16,7 +16,7 @@ export interface CsvRollupOptions extends CsvLoaderOptions {
 
 function matchesPattern(
   id: string,
-  pattern: RegExp | string | Array<RegExp | string> | undefined
+  pattern: RegExp | string | Array<RegExp | string> | undefined,
 ): boolean {
   if (!pattern) return true;
   const patterns = Array.isArray(pattern) ? pattern : [pattern];
@@ -34,7 +34,7 @@ interface TransformResult {
 }
 
 interface EmitFileOptions {
-  type: 'asset';
+  type: "asset";
   fileName: string;
   source: string;
 }
@@ -48,7 +48,7 @@ interface RollupPlugin {
   transform: (
     this: PluginContext,
     code: string,
-    id: string
+    id: string,
   ) => TransformResult | null;
 }
 
@@ -61,13 +61,13 @@ export function csvLoader(options: CsvRollupOptions = {}): RollupPlugin {
     include = /\.csv$/,
     exclude,
     emitTypes = true,
-    typesOutputDir = '',
+    typesOutputDir = "",
     writeToDisk = false,
     ...parseOptions
   } = options;
 
   return {
-    name: 'inline-schema-csv',
+    name: "inline-schema-csv",
 
     transform(code: string, id: string) {
       // Check if file matches the include/exclude patterns
@@ -75,12 +75,12 @@ export function csvLoader(options: CsvRollupOptions = {}): RollupPlugin {
       if (exclude && matchesPattern(id, exclude)) return null;
 
       // Only process .csv files
-      if (!id.endsWith('.csv')) return null;
+      if (!id.endsWith(".csv")) return null;
 
       // Infer resource name from filename
-      const fileName = path.basename(id, '.csv').split('.')[0];
+      const fileName = path.basename(id, ".csv").split(".")[0];
       const resourceName = fileName
-        .replace(/[-_\s]+(.)?/g, (_, char) => char ? char.toUpperCase() : '')
+        .replace(/[-_\s]+(.)?/g, (_, char) => (char ? char.toUpperCase() : ""))
         .replace(/^(.)/, (_, char) => char.toUpperCase());
 
       const result = csvToModule(code, {
@@ -95,8 +95,8 @@ export function csvLoader(options: CsvRollupOptions = {}): RollupPlugin {
       // Emit type definition file if enabled
       if (emitTypes && result.dts) {
         const dtsPath = typesOutputDir
-          ? path.join(typesOutputDir, path.basename(id) + '.d.ts')
-          : id + '.d.ts';
+          ? path.join(typesOutputDir, path.basename(id) + ".d.ts")
+          : id + ".d.ts";
 
         if (writeToDisk) {
           // Write directly to disk
@@ -108,7 +108,7 @@ export function csvLoader(options: CsvRollupOptions = {}): RollupPlugin {
         } else {
           // Emit to Rollup's virtual module system
           this.emitFile({
-            type: 'asset',
+            type: "asset",
             fileName: dtsPath,
             source: result.dts,
           });