diff --git a/packages/knip/fixtures/plugins/lockfile-lint/.lockfile-lint.js b/packages/knip/fixtures/plugins/lockfile-lint/.lockfile-lintrc.js
similarity index 100%
rename from packages/knip/fixtures/plugins/lockfile-lint/.lockfile-lint.js
rename to packages/knip/fixtures/plugins/lockfile-lint/.lockfile-lintrc.js
diff --git a/packages/knip/fixtures/plugins/xo/xo-config.cjs b/packages/knip/fixtures/plugins/xo/xo.config.cjs
similarity index 100%
rename from packages/knip/fixtures/plugins/xo/xo-config.cjs
rename to packages/knip/fixtures/plugins/xo/xo.config.cjs
diff --git a/packages/knip/package.json b/packages/knip/package.json
index 2534f6d6b..ad6c83b96 100644
--- a/packages/knip/package.json
+++ b/packages/knip/package.json
@@ -54,11 +54,7 @@
     "create-plugin": "bun ./scripts/create-new-plugin.ts",
     "postcreate-plugin": "biome format --write schema.json schema-jsonc.json src/ConfigurationValidator.ts"
   },
-  "files": [
-    "dist",
-    "schema.json",
-    "schema-jsonc.json"
-  ],
+  "files": ["dist", "schema.json", "schema-jsonc.json"],
   "dependencies": {
     "@ericcornelissen/bash-parser": "0.5.3",
     "@nodelib/fs.walk": "2.0.0",
diff --git a/packages/knip/src/plugins/commitlint/index.ts b/packages/knip/src/plugins/commitlint/index.ts
index 124a217b9..1a0ef6c44 100644
--- a/packages/knip/src/plugins/commitlint/index.ts
+++ b/packages/knip/src/plugins/commitlint/index.ts
@@ -1,9 +1,10 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 import type { CommitLintConfig } from './types.js';
 
 // https://commitlint.js.org
 // https://github.com/conventional-changelog/commitlint#config
+// https://github.com/conventional-changelog/commitlint/blob/master/%40commitlint/load/src/utils/load-config.ts
 
 const title = 'commitlint';
 
@@ -11,12 +12,7 @@ const enablers = ['@commitlint/cli'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = [
-  '.commitlintrc',
-  '.commitlintrc.{json,yaml,yml,js,cjs,ts,cts}',
-  'commitlint.config.{js,cjs,ts,cts}',
-  'package.json',
-];
+const config = ['package.json', 'package.yaml', ...toCosmiconfig('commitlint', { additionalExtensions: ['cts'] })];
 
 const resolveConfig: ResolveConfig<CommitLintConfig> = async config => {
   const extendsConfigs = config.extends
diff --git a/packages/knip/src/plugins/graphql-codegen/index.ts b/packages/knip/src/plugins/graphql-codegen/index.ts
index 2d7dff08d..502dec661 100644
--- a/packages/knip/src/plugins/graphql-codegen/index.ts
+++ b/packages/knip/src/plugins/graphql-codegen/index.ts
@@ -3,7 +3,6 @@ import { get } from '#p/util/object.js';
 import { isInternal } from '#p/util/path.js';
 import { hasDependency } from '#p/util/plugin.js';
 import { toEntryPattern } from '#p/util/protocols.js';
-import { isConfigurationOutput, isGraphqlConfigTypes, isGraphqlProjectsConfigTypes } from './types.js';
 import type {
   ConfiguredPlugin,
   GraphqlCodegenTypes,
@@ -11,9 +10,14 @@ import type {
   GraphqlProjectsConfigTypes,
   PresetNames,
 } from './types.js';
+import { isConfigurationOutput, isGraphqlConfigTypes, isGraphqlProjectsConfigTypes } from './types.js';
 
+// Both use Cosmiconfig with custom searchPlaces - not using helper as a result
+// Codegen:
 // https://the-guild.dev/graphql/codegen/docs/config-reference/codegen-config
 // https://github.com/dotansimha/graphql-code-generator/blob/master/packages/graphql-codegen-cli/src/config.ts
+// Config:
+// https://the-guild.dev/graphql/config/docs/user/usage#config-search-places
 
 const title = 'GraphQL Codegen';
 
@@ -26,11 +30,10 @@ const packageJsonPath: Plugin['packageJsonPath'] = manifest => get(manifest, 'co
 const config = [
   'package.json',
   // graphql-codegen config files
-  'codegen.{json,yml,yaml,js,ts,mjs,cts}',
+  'codegen.{json,yml,yaml,js,ts}',
   '.codegenrc.{json,yml,yaml,js,ts}',
   'codegen.config.js',
   // graphql-config config files
-  // https://the-guild.dev/graphql/config/docs/user/usage#config-search-places
   '.graphqlrc',
   '.graphqlrc.{json,yml,yaml,toml,js,ts}',
   'graphql.config.{json,yml,yaml,toml,js,cjs,ts}',
diff --git a/packages/knip/src/plugins/lint-staged/index.ts b/packages/knip/src/plugins/lint-staged/index.ts
index 3e9403187..443fa30b7 100644
--- a/packages/knip/src/plugins/lint-staged/index.ts
+++ b/packages/knip/src/plugins/lint-staged/index.ts
@@ -1,5 +1,5 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
-import { getDependenciesFromScripts, hasDependency } from '#p/util/plugin.js';
+import { getDependenciesFromScripts, hasDependency, toLilconfig } from '#p/util/plugin.js';
 import type { LintStagedConfig } from './types.js';
 
 // https://github.com/okonet/lint-staged
@@ -13,12 +13,11 @@ const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependenc
 const packageJsonPath = 'lint-staged';
 
 const config = [
-  '.lintstagedrc',
-  '.lintstagedrc.json',
-  '.lintstagedrc.{yml,yaml}',
-  '.lintstagedrc.{js,mjs,cjs}',
-  'lint-staged.config.{js,mjs,cjs}',
   'package.json',
+  'package.yaml',
+  'package.yml',
+  ...toLilconfig('lint-staged'),
+  ...toLilconfig('lintstaged'),
 ];
 
 const resolveConfig: ResolveConfig<LintStagedConfig> = async (config, options) => {
diff --git a/packages/knip/src/plugins/linthtml/index.ts b/packages/knip/src/plugins/linthtml/index.ts
index 0e324cd12..4144ba218 100644
--- a/packages/knip/src/plugins/linthtml/index.ts
+++ b/packages/knip/src/plugins/linthtml/index.ts
@@ -1,6 +1,6 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
 import { isInternal } from '#p/util/path.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 import { toEntryPattern } from '#p/util/protocols.js';
 import type { PluginConfig } from './types.js';
 
@@ -14,14 +14,7 @@ const enablers = ['@linthtml/linthtml'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = [
-  '.linthtmlrc',
-  '.linthtmlrc.json',
-  '.linthtmlrc.yml',
-  '.linthtmlrc.{js,cjs}',
-  'linthtml.config.js',
-  'package.json',
-];
+const config = ['package.json', ...toCosmiconfig('linthtml')];
 
 const resolveConfig: ResolveConfig<PluginConfig> = config => {
   const extensions = [config.extends ?? []]
diff --git a/packages/knip/src/plugins/lockfile-lint/index.ts b/packages/knip/src/plugins/lockfile-lint/index.ts
index f90e8af6b..008429711 100644
--- a/packages/knip/src/plugins/lockfile-lint/index.ts
+++ b/packages/knip/src/plugins/lockfile-lint/index.ts
@@ -1,6 +1,6 @@
 import type { EnablerPatterns } from '#p/types/config.js';
 import type { IsPluginEnabled, Plugin } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 
 // https://github.com/lirantal/lockfile-lint/blob/main/packages/lockfile-lint/README.md
 
@@ -10,7 +10,7 @@ const enablers: EnablerPatterns = ['lockfile-lint'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['.lockfile-lintrc', '.lockfile-lint.{js,toml}', 'lockfile-lint.config.js', 'package.json'];
+const config = ['package.json', ...toCosmiconfig('lockfile-lint', { additionalExtensions: ['toml'] })];
 
 export default {
   title,
diff --git a/packages/knip/src/plugins/npm-package-json-lint/index.ts b/packages/knip/src/plugins/npm-package-json-lint/index.ts
index 527f2b1dc..86ce74183 100644
--- a/packages/knip/src/plugins/npm-package-json-lint/index.ts
+++ b/packages/knip/src/plugins/npm-package-json-lint/index.ts
@@ -1,5 +1,5 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 import type { NpmPkgJsonLintConfig } from './types.js';
 
 // https://npmpackagejsonlint.org/docs/
@@ -12,7 +12,7 @@ const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependenc
 
 const packageJsonPath = 'npmpackagejsonlint';
 
-const config = ['.npmpackagejsonlintrc.json', 'npmpackagejsonlint.config.js', 'package.json'];
+const config = ['package.json', ...toCosmiconfig('npmpackagejsonlint')];
 
 const resolveConfig: ResolveConfig<NpmPkgJsonLintConfig> = localConfig => {
   return localConfig?.extends ? [localConfig.extends] : [];
diff --git a/packages/knip/src/plugins/postcss/index.ts b/packages/knip/src/plugins/postcss/index.ts
index 4b36da559..1177ab73c 100644
--- a/packages/knip/src/plugins/postcss/index.ts
+++ b/packages/knip/src/plugins/postcss/index.ts
@@ -1,14 +1,21 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toLilconfig } from '#p/util/plugin.js';
 import type { PostCSSConfig } from './types.js';
 
+// https://github.com/postcss/postcss-load-config/blob/main/src/index.js#L110
+// Additionally postcss.config.json is loaded by nextjs
+
 const title = 'PostCSS';
 
 const enablers = ['postcss', 'postcss-cli', 'next'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['postcss.config.{cjs,js}', 'postcss.config.json', 'package.json'];
+const config = [
+  'package.json',
+  'postcss.config.json',
+  ...toLilconfig('postcss', { configDir: false, additionalExtensions: ['ts', 'mts', 'cts', 'yaml', 'yml'] }),
+];
 
 const resolveConfig: ResolveConfig<PostCSSConfig> = config => {
   return config.plugins
diff --git a/packages/knip/src/plugins/prettier/index.ts b/packages/knip/src/plugins/prettier/index.ts
index 2eaea29ca..6f434398b 100644
--- a/packages/knip/src/plugins/prettier/index.ts
+++ b/packages/knip/src/plugins/prettier/index.ts
@@ -3,6 +3,7 @@ import { hasDependency } from '#p/util/plugin.js';
 import type { PrettierConfig } from './types.js';
 
 // https://prettier.io/docs/en/configuration.html
+// https://github.com/prettier/prettier/blob/main/src/config/prettier-config/config-searcher.js
 
 const title = 'Prettier';
 
@@ -13,9 +14,9 @@ const isEnabled: IsPluginEnabled = ({ dependencies, config }) =>
 
 const config = [
   '.prettierrc',
-  '.prettierrc.{json,js,cjs,mjs,yml,yaml}',
+  '.prettierrc.{json,js,cjs,mjs,yml,yaml,toml,json5}',
   'prettier.config.{js,cjs,mjs}',
-  'package.json',
+  'package.{json,yaml}',
 ];
 
 const resolveConfig: ResolveConfig<PrettierConfig> = config => {
diff --git a/packages/knip/src/plugins/release-it/index.ts b/packages/knip/src/plugins/release-it/index.ts
index 657373490..d8fcba644 100644
--- a/packages/knip/src/plugins/release-it/index.ts
+++ b/packages/knip/src/plugins/release-it/index.ts
@@ -3,6 +3,8 @@ import { getDependenciesFromScripts, hasDependency } from '#p/util/plugin.js';
 import type { ReleaseItConfig } from './types.js';
 
 // https://github.com/release-it/release-it/blob/master/docs/plugins.md#using-a-plugin
+// Uses CosmiConfig but with custom searchPlaces
+// https://github.com/release-it/release-it/blob/main/lib/config.js
 
 const title = 'Release It';
 
@@ -12,7 +14,7 @@ const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependenc
 
 const packageJsonPath = 'release-it';
 
-const config = ['.release-it.json', '.release-it.{js,cjs}', '.release-it.{yml,yaml}', 'package.json'];
+const config = ['.release-it.{json,js,cjs,ts,yml,yaml,toml}', 'package.json'];
 
 const resolveConfig: ResolveConfig<ReleaseItConfig> = (config, options) => {
   const plugins = config.plugins ? Object.keys(config.plugins) : [];
diff --git a/packages/knip/src/plugins/semantic-release/index.ts b/packages/knip/src/plugins/semantic-release/index.ts
index 7b4e4ef02..42039663b 100644
--- a/packages/knip/src/plugins/semantic-release/index.ts
+++ b/packages/knip/src/plugins/semantic-release/index.ts
@@ -1,5 +1,5 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 import type { SemanticReleaseConfig } from './types.js';
 
 // https://github.com/semantic-release/semantic-release/blob/master/docs/usage/configuration.md#configuration-file
@@ -12,7 +12,7 @@ const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependenc
 
 const packageJsonPath = 'release';
 
-const config = ['.releaserc', '.releaserc.{yaml,yml,json,js,cjs}', 'release.config.{js,cjs}', 'package.json'];
+const config = ['package.json', ...toCosmiconfig('release')];
 
 const resolveConfig: ResolveConfig<SemanticReleaseConfig> = config => {
   const plugins = (config?.plugins ?? []).map(plugin => (Array.isArray(plugin) ? plugin[0] : plugin));
diff --git a/packages/knip/src/plugins/size-limit/index.ts b/packages/knip/src/plugins/size-limit/index.ts
index 7cfa0ec09..10d485ee0 100644
--- a/packages/knip/src/plugins/size-limit/index.ts
+++ b/packages/knip/src/plugins/size-limit/index.ts
@@ -1,8 +1,10 @@
 import type { EnablerPatterns } from '#p/types/config.js';
 import type { IsPluginEnabled, Plugin } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toLilconfig } from '#p/util/plugin.js';
 
 // https://github.com/ai/size-limit
+// Uses lilconfig but with custom searchPlaces
+// https://github.com/ai/size-limit/blob/main/packages/size-limit/get-config.js
 
 const title = 'size-limit';
 
@@ -10,7 +12,10 @@ const enablers: EnablerPatterns = ['size-limit'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config: string[] = ['.size-limit.{json,js,cjs,ts}', 'package.json'];
+const config = [
+  'package.json',
+  ...toLilconfig('size-limit', { configDir: false, additionalExtensions: ['ts', 'mts', 'cts'], rcSuffix: '' }),
+];
 
 export default {
   title,
diff --git a/packages/knip/src/plugins/stylelint/index.ts b/packages/knip/src/plugins/stylelint/index.ts
index 9e506ad5f..794611228 100644
--- a/packages/knip/src/plugins/stylelint/index.ts
+++ b/packages/knip/src/plugins/stylelint/index.ts
@@ -1,6 +1,6 @@
 import type { IsPluginEnabled, Plugin, ResolveConfig } from '#p/types/plugins.js';
 import { isInternal } from '#p/util/path.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 import type { BaseStyleLintConfig, StyleLintConfig } from './types.js';
 
 // https://stylelint.io/user-guide/configure/
@@ -11,7 +11,7 @@ const enablers = ['stylelint'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['.stylelintrc', '.stylelintrc.{cjs,js,json,yaml,yml}', 'stylelint.config.{cjs,mjs,js}'];
+const config = ['package.json', ...toCosmiconfig('stylelint')];
 
 const resolve = (config: StyleLintConfig | BaseStyleLintConfig): string[] => {
   const extend = config.extends ? [config.extends].flat().filter(id => !isInternal(id)) : [];
diff --git a/packages/knip/src/plugins/syncpack/index.ts b/packages/knip/src/plugins/syncpack/index.ts
index 0100a486b..529bca12a 100644
--- a/packages/knip/src/plugins/syncpack/index.ts
+++ b/packages/knip/src/plugins/syncpack/index.ts
@@ -1,6 +1,7 @@
 import type { EnablerPatterns } from '#p/types/config.js';
 import type { IsPluginEnabled, Plugin } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { get } from '#p/util/object.js';
+import { hasDependency, toCosmiconfig } from '#p/util/plugin.js';
 
 // link to syncpack docs https://jamiemason.github.io/syncpack/config/syncpackrc/
 
@@ -10,11 +11,13 @@ const enablers: EnablerPatterns = ['syncpack'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['.syncpackrc', '.syncpackrc.{json,yaml,yml,js,cjs}', '.syncpack.config.{js,cjs}'];
+const config = ['package.json', ...toCosmiconfig('syncpack')];
+const packageJsonPath: Plugin['packageJsonPath'] = manifest => get(manifest, 'syncpack');
 
 export default {
   title,
   enablers,
   isEnabled,
   config,
+  packageJsonPath,
 } satisfies Plugin;
diff --git a/packages/knip/src/plugins/tailwind/index.ts b/packages/knip/src/plugins/tailwind/index.ts
index d5308936a..94745291d 100644
--- a/packages/knip/src/plugins/tailwind/index.ts
+++ b/packages/knip/src/plugins/tailwind/index.ts
@@ -2,6 +2,7 @@ import type { IsPluginEnabled, Plugin } from '#p/types/plugins.js';
 import { hasDependency } from '#p/util/plugin.js';
 
 // https://tailwindcss.com/docs/configuration
+// Tailwinds lilconfig dependency is only used for postcss
 
 const title = 'Tailwind';
 
diff --git a/packages/knip/src/plugins/tsup/index.ts b/packages/knip/src/plugins/tsup/index.ts
index c34b3a85b..d38056f70 100644
--- a/packages/knip/src/plugins/tsup/index.ts
+++ b/packages/knip/src/plugins/tsup/index.ts
@@ -4,6 +4,7 @@ import { toProductionEntryPattern } from '#p/util/protocols.js';
 import type { TsupConfig } from './types.js';
 
 // https://paka.dev/npm/tsup/api
+// https://github.com/egoist/tsup/blob/dev/src/load.ts
 
 const title = 'tsup';
 
@@ -11,7 +12,7 @@ const enablers = ['tsup'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config = ['tsup.config.{js,ts,cjs,json}', 'package.json'];
+const config = ['tsup.config.{js,ts,cjs,mjs,json}', 'package.json'];
 
 const resolveConfig: ResolveConfig<TsupConfig> = async config => {
   if (typeof config === 'function') config = await config({});
diff --git a/packages/knip/src/plugins/typedoc/index.ts b/packages/knip/src/plugins/typedoc/index.ts
index 558bd8b92..7051ab7b4 100644
--- a/packages/knip/src/plugins/typedoc/index.ts
+++ b/packages/knip/src/plugins/typedoc/index.ts
@@ -3,6 +3,7 @@ import { hasDependency } from '#p/util/plugin.js';
 import type { TypeDocConfig } from './types.js';
 
 // https://typedoc.org/guides/overview/
+// https://github.com/TypeStrong/typedoc/blob/9f0fb048399c7a1273dc452d01cca92b34f4675b/src/lib/utils/options/readers/typedoc.ts#L168
 
 const title = 'TypeDoc';
 
@@ -13,10 +14,10 @@ const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependenc
 const packageJsonPath = 'typedocOptions';
 
 const config = [
-  'typedoc.{js,cjs,json,jsonc}',
-  'typedoc.config.{js,cjs}',
-  '.config/typedoc.{js,cjs,json,jsonc}',
-  '.config/typedoc.config.{js,cjs}',
+  'typedoc.{js,cjs,mjs,json,jsonc}',
+  'typedoc.config.{js,cjs,mjs}',
+  '.config/typedoc.{js,cjs,mjs,json,jsonc}',
+  '.config/typedoc.config.{js,cjs,mjs}',
   'package.json',
   'tsconfig.json',
 ];
diff --git a/packages/knip/src/plugins/unocss/index.ts b/packages/knip/src/plugins/unocss/index.ts
index 0e682f4cd..14f573d54 100644
--- a/packages/knip/src/plugins/unocss/index.ts
+++ b/packages/knip/src/plugins/unocss/index.ts
@@ -1,8 +1,9 @@
 import type { EnablerPatterns } from '#p/types/config.js';
 import type { IsPluginEnabled, Plugin } from '#p/types/plugins.js';
-import { hasDependency } from '#p/util/plugin.js';
+import { hasDependency, toUnconfig } from '#p/util/plugin.js';
 
 // https://unocss.dev/guide/config-file
+// https://github.com/unocss/unocss/blob/main/packages/config/src/index.ts
 
 const title = 'UnoCSS';
 
@@ -10,7 +11,7 @@ const enablers: EnablerPatterns = ['unocss'];
 
 const isEnabled: IsPluginEnabled = ({ dependencies }) => hasDependency(dependencies, enablers);
 
-const config: string[] = ['uno.config.{js,ts,mjs,mts}', 'unocss.config.{js,ts,mjs,mts}'];
+const config = [...toUnconfig('uno.config'), ...toUnconfig('unocss.config')];
 
 export default {
   title,
diff --git a/packages/knip/src/plugins/xo/index.ts b/packages/knip/src/plugins/xo/index.ts
index 055f15a3f..f046de92d 100644
--- a/packages/knip/src/plugins/xo/index.ts
+++ b/packages/knip/src/plugins/xo/index.ts
@@ -5,6 +5,8 @@ import { getDependenciesDeep } from '../eslint/helpers.js';
 import type { XOConfig } from './types.js';
 
 // link to xo docs: https://github.com/xojs/xo#config
+// Uses custom cosmiconfig search paths
+// https://github.com/xojs/xo/blob/ee9f0a3d72d55df098fc321c4d54a1ea3804e226/lib/constants.js
 
 const title = 'xo';
 
@@ -14,9 +16,9 @@ const isEnabled: IsPluginEnabled = ({ dependencies, config }) =>
   hasDependency(dependencies, enablers) || 'xo' in config;
 
 const packageJsonPath = 'xo';
-const config: string[] = ['{.,}xo-config.{js,cjs,json,}', 'package.json'];
+const config = ['package.json', '.xo-config', '.xo-config.{js,cjs,json}', 'xo.config.{js,cjs}'];
 
-const entry: string[] = ['{.,}xo-config.{js,cjs}'];
+const entry: string[] = ['.xo-config.{js,cjs}', 'xo.config.{js,cjs}'];
 
 const resolveConfig: ResolveConfig<XOConfig> = async (config, options) => {
   const dependencies = await getDependenciesDeep(config, options);
diff --git a/packages/knip/src/util/plugin.ts b/packages/knip/src/util/plugin.ts
index 4a981ff31..d865ecfb5 100644
--- a/packages/knip/src/util/plugin.ts
+++ b/packages/knip/src/util/plugin.ts
@@ -1,7 +1,7 @@
-export { _load as load } from './loader.js';
+export { _getDependenciesFromScripts as getDependenciesFromScripts } from '../binaries/index.js';
 export { _loadJSON as loadJSON } from './fs.js';
+export { _load as load } from './loader.js';
 export { _tryResolve as tryResolve } from './require.js';
-export { _getDependenciesFromScripts as getDependenciesFromScripts } from '../binaries/index.js';
 import type { RawPluginConfiguration } from '../types/config.js';
 import type { Plugin, PluginOptions } from '../types/plugins.js';
 import { arrayify } from './array.js';
@@ -81,3 +81,57 @@ export const getFinalEntryPaths = (plugin: Plugin, options: PluginOptions, confi
       ? configEntryPaths
       : [...(plugin.entry ?? []).map(toEntryPattern), ...(plugin.production ?? []).map(toProductionEntryPattern)];
 };
+
+const toConfigMap =
+  (
+    defaultExtensions: string[],
+    builderConfig: {
+      rcPrefix?: string;
+      rcSuffix?: string;
+      configDir?: boolean;
+      configFiles?: boolean;
+      configFilesAllExtensions?: boolean;
+      additionalExtensions?: string[];
+    }
+  ) =>
+  (moduleName: string, options?: typeof builderConfig) => {
+    const config = {
+      rcPrefix: '.',
+      rcSuffix: 'rc',
+      // Generate .config/<file>
+      configDir: true,
+      // Generate <file>.config.<ext>
+      configFiles: true,
+      // Allow for .json, .yaml, .yml, .toml etc
+      configFilesAllExtensions: false,
+      additionalExtensions: [],
+      ...builderConfig,
+      ...options,
+    };
+    const { rcPrefix, rcSuffix } = config;
+    const jsTypeExtensions = ['js', 'ts', 'cjs', 'mjs', 'cts', 'mts'];
+    const extensions = [...defaultExtensions, ...config.additionalExtensions];
+
+    const baseFiles = [
+      `${rcPrefix}${moduleName}${rcSuffix}`,
+      ...(config.configDir ? [`.config/${moduleName}${rcSuffix}`] : []),
+    ];
+
+    const rcFiles = `${rcPrefix}${moduleName}${rcSuffix}.{${extensions.join(',')}}`;
+    const configExtensions = extensions.filter(
+      ext => config.configFilesAllExtensions || jsTypeExtensions.includes(ext)
+    );
+    const configFiles = !!config.configFiles && `${moduleName}.config.{${configExtensions.join(',')}}`;
+    const configDirFiles = !!config.configDir && `.config/${moduleName}${rcSuffix}.{${extensions.join(',')}}`;
+
+    return [...baseFiles, rcFiles, configFiles, configDirFiles].filter(item => item !== false);
+  };
+
+export const toCosmiconfig = toConfigMap(['json', 'yaml', 'yml', 'js', 'ts', 'cjs', 'mjs'], { configDir: true });
+export const toLilconfig = toConfigMap(['json', 'js', 'cjs', 'mjs'], { configDir: true });
+export const toUnconfig = toConfigMap(['json', 'ts', 'mts', 'cts', 'js', 'mjs', 'cjs'], {
+  configDir: false,
+  rcPrefix: '',
+  rcSuffix: '',
+  configFiles: false,
+});
diff --git a/packages/knip/test/plugins/xo.test.ts b/packages/knip/test/plugins/xo.test.ts
index 7774edbea..f184bcbae 100644
--- a/packages/knip/test/plugins/xo.test.ts
+++ b/packages/knip/test/plugins/xo.test.ts
@@ -14,7 +14,7 @@ test('Find dependencies with the xo plugin', async () => {
   });
 
   assert(issues.unlisted['.xo-config.js']['eslint-plugin-unused-imports']);
-  assert(issues.unlisted['xo-config.cjs']['glob']);
+  assert(issues.unlisted['xo.config.cjs']['glob']);
   assert(issues.unlisted['package.json']['eslint-plugin-eslint-comments']);
 
   assert.deepEqual(counters, {