fix: accept non-array resolver in resolver-next setting (#321)

Co-authored-by: JounQin <admin@1stg.me>

Author: SukkaW

.changeset/cyan-icons-fetch.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-import-x": patch
+---
+
+fix: accept non-array resolver in `resolver-next` setting

src/types.ts

@@ -101,7 +101,7 @@ export interface ImportSettings {
   resolve?: NodeResolverOptions
   resolver?: LegacyImportResolver
   'resolver-legacy'?: LegacyImportResolver
-  'resolver-next'?: NewResolver[]
+  'resolver-next'?: NewResolver[] | NewResolver
 }
 
 export type WithPluginName<T extends string | object> = T extends string

src/utils/resolve.ts

@@ -145,7 +145,11 @@ function fullResolve(
     Object.prototype.hasOwnProperty.call(settings, 'import-x/resolver-next') &&
     settings['import-x/resolver-next']
   ) {
-    const configResolvers = settings['import-x/resolver-next']
+    let configResolvers = settings['import-x/resolver-next']
+
+    if (!Array.isArray(configResolvers)) {
+      configResolvers = [configResolvers]
+    }
 
     for (let i = 0, len = configResolvers.length; i < len; i++) {
       const resolver = configResolvers[i]

test/utils/resolve.spec.ts

@@ -162,6 +162,15 @@ describe('resolve', () => {
     expect(resolve('../fixtures/foo', context)).toBe(testFilePath('./bar.jsx'))
   })
 
+  it('non-array resolver interface v3', () => {
+    const context = testContext({
+      'import-x/resolver-next': require<{
+        foobarResolver: NewResolver
+      }>('../fixtures/foo-bar-resolver-v3').foobarResolver,
+    })
+    expect(resolve('../fixtures/foo', context)).toBe(testFilePath('./bar.jsx'))
+  })
+
   it('reports invalid import-x/resolver config', () => {
     const context = testContext({
       // @ts-expect-error - testing