Fix grouping bug with undefined settings

.changeset/shaggy-meals-serve.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-import-sorting': patch
+---
+
+Fix bug with grouping when settings are not explicitly defined

src/utils/compute-group.ts

@@ -32,8 +32,8 @@ export function computeGroup(
 		if (isSideEffectImport(node, sourceCode)) defineGroup('unassigned')
 		if (isBuiltin(value)) defineGroup('builtin')
 		if (isStyle(value)) defineGroup('style')
-		if (isFramework(value, frameworkPatterns)) defineGroup('framework')
-		if (isInternal(value, internalPatterns)) defineGroup('internal')
+		if (frameworkPatterns && isFramework(value, frameworkPatterns)) defineGroup('framework')
+		if (internalPatterns && isInternal(value, internalPatterns)) defineGroup('internal')
 		if (isExternal(value)) defineGroup('external')
 		if (isLocal(value)) defineGroup('local')
 	}
@@ -122,7 +122,7 @@ function assertString(value: unknown, setting: string) {
 function validateSetting(settings: TSESLint.SharedConfigurationSettings, setting: string) {
 	let value = settings[setting] as string | string[]
 
-	if (!value) return ''
+	if (!value) return undefined
 	if (Array.isArray(value)) {
 		for (let item of value) {
 			assertString(item, setting)

tests/rules/order.test.ts

@@ -154,19 +154,32 @@ describe('order', () => {
 				{
 					name: 'groups local modules together',
 					code: dedent`
+						import { AST_NODE_TYPES, type TSESLint, type TSESTree } from '@typescript-eslint/utils'
 						import prettier from 'eslint-config-prettier'
 						import xoTypeScript from 'eslint-config-xo-typescript'
 						import etc from 'eslint-plugin-etc'
 						import stylistic from './stylistic.js'
+						import { other } from '../other.js'
 					`,
 					output: dedent`
+						import { AST_NODE_TYPES, type TSESLint, type TSESTree } from '@typescript-eslint/utils'
 						import prettier from 'eslint-config-prettier'
 						import xoTypeScript from 'eslint-config-xo-typescript'
 						import etc from 'eslint-plugin-etc'
 
+						import { other } from '../other.js'
 						import stylistic from './stylistic.js'
 					`,
-					errors: [{ messageId: 'needs-newline' }],
+					errors: [
+						{
+							messageId: 'needs-newline',
+							data: { left: 'eslint-plugin-etc', right: './stylistic.js' },
+						},
+						{
+							messageId: 'out-of-order',
+							data: { left: './stylistic.js', right: '../other.js' },
+						},
+					],
 				},
 
 				{