feat: support pass prev source map 🍉

Author: fz6m

src/interface.ts

@@ -16,6 +16,7 @@ type AllowTransformOpts = Omit<
    * @analyzeDependencies
    * @pseudoClasses
    * @unusedSymbols
+   * @errorRecovery
    */
 >
 
@@ -30,18 +31,18 @@ export interface IMinifyPluginOpts extends AllowTransformOpts {
 // loader
 type AllowLoaderTransformOpts = Omit<
   TransformOptions,
-  'filename' | 'code' | 'targets'
+  'filename' | 'code' | 'targets' | 'inputSourceMap'
   /**
    * allow
    *
    * @cssModules
    * @minify
    * @sourceMap
-   * @targets
    * @drafts
    * @analyzeDependencies
    * @pseudoClasses
    * @unusedSymbols
+   * @errorRecovery
    */
 >
 

src/loader.ts

@@ -7,7 +7,8 @@ import { getTargets } from './utils'
 const LOADER_NAME = `parcel-css-loader`
 export async function ParcelCssLoader(
   this: LoaderContext<IParcelCssLoaderConfig>,
-  source: string
+  source: string,
+  prevMap?: Record<string, any>
 ): Promise<void> {
   const done = this.async()
   const options = this.getOptions()
@@ -30,6 +31,8 @@ export async function ParcelCssLoader(
       code: Buffer.from(source),
       sourceMap: this.sourceMap,
       targets: getTargets({ default: userTargets, key: ECacheKey.loader }),
+      inputSourceMap:
+        this.sourceMap && prevMap ? JSON.stringify(prevMap) : undefined,
       ...opts,
     })
     const codeAsString = code.toString()