fix: generate sourcemap (#382)

src/core/ctx.ts

@@ -193,7 +193,7 @@ ${dts}`.trim()}\n`
 
     return {
       code: s.toString(),
-      map: s.generateMap({ source: id, includeContent: true }),
+      map: s.generateMap({ source: id, includeContent: true, hires: options.sourcemapHires }),
     }
   }
 

src/types.ts

@@ -145,6 +145,16 @@ export interface Options {
    * Generate corresponding .eslintrc-auto-import.json file.
    */
   eslintrc?: ESLintrc
+
+  /**
+   * https://github.com/antfu/unplugin-auto-import/issues/382
+   * Whether the mapping should be high-resolution.
+   * Hi-res mappings map every single character, meaning (for example) your devtools will always
+   * be able to pinpoint the exact location of function calls and so on.
+   * With lo-res mappings, devtools may only be able to identify the correct
+   * line - but they're quicker to generate and less bulky.
+   */
+  sourcemapHires?: boolean
 }
 
 export { PresetName }