From 785c141bf09ee024935a14897446ef0e2ea95210 Mon Sep 17 00:00:00 2001
From: Anthony Fu <anthonyfu117@hotmail.com>
Date: Wed, 25 Aug 2021 23:46:09 +0800
Subject: [PATCH] feat: new presetOverriding option

---
 src/core/options.ts | 6 +++---
 src/types.ts        | 6 ++++++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/core/options.ts b/src/core/options.ts
index 9a239d3..00a1690 100644
--- a/src/core/options.ts
+++ b/src/core/options.ts
@@ -5,7 +5,7 @@ import { presets } from '../presets'
 import { ImportInfo, ImportsFlatMap, Options, ResolvedOptions } from '../types'
 
 export function resolveOptions(options: Options = {}): ResolvedOptions {
-  const imports = flattenImportsMap(options.imports)
+  const imports = flattenImportsMap(options.imports, options.presetOverriding)
   const resolved: ResolvedOptions = {
     ...options,
     dts: options.dts === false
@@ -22,7 +22,7 @@ export function resolveOptions(options: Options = {}): ResolvedOptions {
   return resolved
 }
 
-export function flattenImportsMap(map: Options['imports']): ImportsFlatMap {
+export function flattenImportsMap(map: Options['imports'], overriding = false): ImportsFlatMap {
   const flat: ImportsFlatMap = {}
   toArray(map).forEach((definition) => {
     if (typeof definition === 'string') {
@@ -45,7 +45,7 @@ export function flattenImportsMap(map: Options['imports']): ImportsFlatMap {
           meta.name = id
         }
 
-        if (flat[meta.name])
+        if (flat[meta.name] && !overriding)
           throw new Error(`[auto-import] identifier ${meta.name} already defined with ${flat[meta.name].module}`)
 
         flat[meta.name] = meta
diff --git a/src/types.ts b/src/types.ts
index 46126c1..9b663a2 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -32,6 +32,12 @@ export interface Options {
    * @default './auto-imports.d.ts'
    */
   dts?: string | false
+  /**
+   * Allow overriding imports sources from multiple presets.
+   *
+   * @default false
+   */
+  presetOverriding?: boolean
   /**
    * Rules to include transforming target.
    *