feat: add writeToDisk option for dev server support

- Add writeToDisk option to write .d.ts files directly to disk
- Useful for rsbuild/rspack dev server which uses in-memory FS
- Set writeToDisk: true in dev mode to see generated types

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

csv-loader.md

@@ -43,6 +43,7 @@ module.exports = {
             trim: true,       // 修剪表头和值的前后空格 (默认 true)
             // emitTypes: false, // 禁用类型定义生成 (默认 true)
             // typesOutputDir: 'types', // 类型文件输出目录 (可选)
+            // writeToDisk: true, // 在 dev server 下写入磁盘 (默认 false)
           },
         },
       },
@@ -96,6 +97,7 @@ import type { RowType } from './data.schema.csv';
 | `trim` | boolean | `true` | Trim headers and values |
 | `emitTypes` | boolean | `true` | Generate TypeScript declaration file (.d.ts) |
 | `typesOutputDir` | string | `''` | Output directory for generated type files (relative to output path) |
+| `writeToDisk` | boolean | `false` | Write .d.ts files directly to disk (useful for dev server) |
 
 ## Schema Syntax
 

dist/csv-loader/loader.d.mts

@@ -11,6 +11,8 @@ interface CsvLoaderOptions {
     emitTypes?: boolean;
     /** Output directory for generated type files (relative to output path) */
     typesOutputDir?: string;
+    /** Write .d.ts files to disk (useful for dev server) */
+    writeToDisk?: boolean;
 }
 declare function csvLoader(this: LoaderContext<CsvLoaderOptions>, content: string): string | Buffer;
 

dist/csv-loader/loader.d.ts

@@ -11,6 +11,8 @@ interface CsvLoaderOptions {
     emitTypes?: boolean;
     /** Output directory for generated type files (relative to output path) */
     typesOutputDir?: string;
+    /** Write .d.ts files to disk (useful for dev server) */
+    writeToDisk?: boolean;
 }
 declare function csvLoader(this: LoaderContext<CsvLoaderOptions>, content: string): string | Buffer;
 

dist/csv-loader/loader.js

@@ -365,6 +365,7 @@ function createValidator(schema) {
 
 // src/csv-loader/loader.ts
 var path = __toESM(require("path"));
+var fs = __toESM(require("fs"));
 function schemaToTypeString(schema) {
   switch (schema.type) {
     case "string":
@@ -411,6 +412,7 @@ function csvLoader(content) {
   const trim = options?.trim ?? true;
   const emitTypes = options?.emitTypes ?? true;
   const typesOutputDir = options?.typesOutputDir ?? "";
+  const writeToDisk = options?.writeToDisk ?? false;
   const records = (0, import_sync.parse)(content, {
     delimiter,
     quote,
@@ -475,7 +477,13 @@ function csvLoader(content) {
     const dtsFileName = relativePath.replace(/\.csv$/, ".d.ts");
     const outputPath = typesOutputDir ? path.join(typesOutputDir, dtsFileName) : dtsFileName;
     const dtsContent = generateTypeDefinition(this.resourcePath, propertyConfigs, `./${relativePath}`);
-    this.emitFile?.(outputPath, dtsContent);
+    if (writeToDisk) {
+      const absolutePath = path.join(this.context || process.cwd(), typesOutputDir || "", dtsFileName);
+      fs.mkdirSync(path.dirname(absolutePath), { recursive: true });
+      fs.writeFileSync(absolutePath, dtsContent);
+    } else {
+      this.emitFile?.(outputPath, dtsContent);
+    }
   }
   return `export default ${json};`;
 }

dist/csv-loader/loader.mjs

@@ -331,6 +331,7 @@ function createValidator(schema) {
 
 // src/csv-loader/loader.ts
 import * as path from "path";
+import * as fs from "fs";
 function schemaToTypeString(schema) {
   switch (schema.type) {
     case "string":
@@ -377,6 +378,7 @@ function csvLoader(content) {
   const trim = options?.trim ?? true;
   const emitTypes = options?.emitTypes ?? true;
   const typesOutputDir = options?.typesOutputDir ?? "";
+  const writeToDisk = options?.writeToDisk ?? false;
   const records = parse(content, {
     delimiter,
     quote,
@@ -441,7 +443,13 @@ function csvLoader(content) {
     const dtsFileName = relativePath.replace(/\.csv$/, ".d.ts");
     const outputPath = typesOutputDir ? path.join(typesOutputDir, dtsFileName) : dtsFileName;
     const dtsContent = generateTypeDefinition(this.resourcePath, propertyConfigs, `./${relativePath}`);
-    this.emitFile?.(outputPath, dtsContent);
+    if (writeToDisk) {
+      const absolutePath = path.join(this.context || process.cwd(), typesOutputDir || "", dtsFileName);
+      fs.mkdirSync(path.dirname(absolutePath), { recursive: true });
+      fs.writeFileSync(absolutePath, dtsContent);
+    } else {
+      this.emitFile?.(outputPath, dtsContent);
+    }
   }
   return `export default ${json};`;
 }

src/csv-loader/loader.ts

@@ -3,6 +3,7 @@ import { parse } from 'csv-parse/sync';
 import { parseSchema, createValidator, parseValue } from '../index.js';
 import type { Schema } from '../types.js';
 import * as path from 'path';
+import * as fs from 'fs';
 
 export interface CsvLoaderOptions {
   delimiter?: string;
@@ -15,6 +16,8 @@ export interface CsvLoaderOptions {
   emitTypes?: boolean;
   /** Output directory for generated type files (relative to output path) */
   typesOutputDir?: string;
+  /** Write .d.ts files to disk (useful for dev server) */
+  writeToDisk?: boolean;
 }
 
 interface PropertyConfig {
@@ -91,6 +94,7 @@ export default function csvLoader(
   const trim = options?.trim ?? true;
   const emitTypes = options?.emitTypes ?? true;
   const typesOutputDir = options?.typesOutputDir ?? '';
+  const writeToDisk = options?.writeToDisk ?? false;
 
   const records = parse(content, {
     delimiter,
@@ -170,7 +174,15 @@ export default function csvLoader(
       : dtsFileName;
     const dtsContent = generateTypeDefinition(this.resourcePath, propertyConfigs, `./${relativePath}`);
 
-    this.emitFile?.(outputPath, dtsContent);
+    if (writeToDisk) {
+      // Write directly to disk (useful for dev server)
+      const absolutePath = path.join(this.context || process.cwd(), typesOutputDir || '', dtsFileName);
+      fs.mkdirSync(path.dirname(absolutePath), { recursive: true });
+      fs.writeFileSync(absolutePath, dtsContent);
+    } else {
+      // Emit to in-memory filesystem (for production build)
+      this.emitFile?.(outputPath, dtsContent);
+    }
   }
 
   return `export default ${json};`;