feat: add support for using resolver object directly in settings (#159)

Co-authored-by: Sukka <isukkaw@gmail.com>

.changeset/red-rings-pay.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-import-x": minor
+---
+
+feat: add support for using resolver object directly in settings

README.md

@@ -298,6 +298,40 @@ module.exports = {
 }
 ```
 
+- use the `import` or `require` syntax to directly import the resolver object:
+
+```js
+// .eslintrc.mjs
+import tsResolver from 'eslint-import-resolver-typescript'
+
+export default {
+  settings: {
+    'import-x/resolver': {
+      name: 'tsResolver', // required, could be any string you like
+      // enable: false, // optional, defaults to true
+      options: { someConfig: value }, // optional, options to pass to the resolver
+      resolver: tsResolver, // required, the resolver object
+    },
+  },
+}
+```
+
+```js
+// .eslintrc.cjs
+const tsResolver = require('eslint-import-resolver-typescript')
+
+module.exports = {
+  settings: {
+    'import-x/resolver': {
+      name: 'tsResolver', // required, could be any string you like
+      // enable: false, // optional, defaults to true
+      options: { someConfig: value }, // optional, options to pass to the resolver
+      resolver: tsResolver, // required, the resolver object
+    },
+  },
+}
+```
+
 Relative paths will be resolved relative to the source's nearest `package.json` or
 the process's current working directory if no `package.json` is found.
 

src/types.ts

@@ -32,14 +32,73 @@ export type DocStyle = 'jsdoc' | 'tomdoc'
 
 export type Arrayable<T> = T | readonly T[]
 
+export type ResultNotFound = {
+  found: false
+  path?: undefined
+}
+
+export type ResultFound = {
+  found: true
+  path: string | null
+}
+
+export type ResolvedResult = ResultNotFound | ResultFound
+
+export type ResolverResolve<T = unknown> = (
+  modulePath: string,
+  sourceFile: string,
+  config: T,
+) => ResolvedResult
+
+export type ResolverResolveImport<T = unknown> = (
+  modulePath: string,
+  sourceFile: string,
+  config: T,
+) => string | undefined
+
+export type Resolver<T = unknown, U = T> = {
+  interfaceVersion?: 1 | 2
+  resolve: ResolverResolve<T>
+  resolveImport: ResolverResolveImport<U>
+}
+
+export type ResolverName = LiteralUnion<
+  'node' | 'typescript' | 'webpack',
+  string
+>
+
+export type ResolverRecord = {
+  node?: boolean | NodeResolverOptions
+  typescript?: boolean | TsResolverOptions
+  webpack?: WebpackResolverOptions
+  [resolve: string]: unknown
+}
+
+export type ResolverObject = {
+  // node, typescript, webpack...
+  name: ResolverName
+
+  // Enabled by default
+  enable?: boolean
+
+  // Options passed to the resolver
+  options?:
+    | NodeResolverOptions
+    | TsResolverOptions
+    | WebpackResolverOptions
+    | unknown
+
+  // Any object satisfied Resolver type
+  resolver: Resolver
+}
+
 export type ImportResolver =
-  | LiteralUnion<'node' | 'typescript' | 'webpack', string>
-  | {
-      node?: boolean | NodeResolverOptions
-      typescript?: boolean | TsResolverOptions
-      webpack?: WebpackResolverOptions
-      [resolve: string]: unknown
-    }
+  | ResolverName
+  | ResolverRecord
+  | ResolverObject
+  | ResolverName[]
+  | ResolverRecord[]
+  | ResolverObject[]
 
 export type ImportSettings = {
   cache?: {
@@ -53,7 +112,7 @@ export type ImportSettings = {
   internalRegex?: string
   parsers?: Record<string, readonly FileExtension[]>
   resolve?: NodeResolverOptions
-  resolver?: Arrayable<ImportResolver>
+  resolver?: ImportResolver
 }
 
 export type WithPluginName<T extends string | object> = T extends string

src/utils/resolve.ts

@@ -5,46 +5,18 @@ import path from 'node:path'
 import stableHash from 'stable-hash'
 
 import type {
-  Arrayable,
-  ImportResolver,
   ImportSettings,
   PluginSettings,
   RuleContext,
+  Resolver,
+  ImportResolver,
+  ResolverRecord,
+  ResolverObject,
 } from '../types'
 
 import { ModuleCache } from './module-cache'
 import { pkgDir } from './pkg-dir'
 
-export type ResultNotFound = {
-  found: false
-  path?: undefined
-}
-
-export type ResultFound = {
-  found: true
-  path: string | null
-}
-
-export type ResolvedResult = ResultNotFound | ResultFound
-
-export type ResolverResolve = (
-  modulePath: string,
-  sourceFile: string,
-  config: unknown,
-) => ResolvedResult
-
-export type ResolverResolveImport = (
-  modulePath: string,
-  sourceFile: string,
-  config: unknown,
-) => string | undefined
-
-export type Resolver = {
-  interfaceVersion?: 1 | 2
-  resolve: ResolverResolve
-  resolveImport: ResolverResolveImport
-}
-
 export const CASE_SENSITIVE_FS = !fs.existsSync(
   path.resolve(
     __dirname,
@@ -184,11 +156,14 @@ function fullResolve(
     node: settings['import-x/resolve'],
   } // backward compatibility
 
-  const resolvers = resolverReducer(configResolvers, new Map())
+  const resolvers = normalizeConfigResolvers(configResolvers, sourceFile)
+
+  for (const { enable, options, resolver } of resolvers) {
+    if (!enable) {
+      continue
+    }
 
-  for (const [name, config] of resolvers) {
-    const resolver = requireResolver(name, sourceFile)
-    const resolved = withResolver(resolver, config)
+    const resolved = withResolver(resolver, options)
 
     if (!resolved.found) {
       continue
@@ -212,30 +187,58 @@ export function relative(
   return fullResolve(modulePath, sourceFile, settings).path
 }
 
-function resolverReducer(
-  resolvers: Arrayable<ImportResolver>,
-  map: Map<string, unknown>,
+function normalizeConfigResolvers(
+  resolvers: ImportResolver,
+  sourceFile: string,
 ) {
-  if (Array.isArray(resolvers)) {
-    for (const r of resolvers as ImportResolver[]) resolverReducer(r, map)
-    return map
-  }
-
-  if (typeof resolvers === 'string') {
-    map.set(resolvers, null)
-    return map
-  }
-
-  if (typeof resolvers === 'object') {
-    for (const [key, value] of Object.entries(resolvers)) {
-      map.set(key, value)
+  const resolverArray = Array.isArray(resolvers) ? resolvers : [resolvers]
+  const map = new Map<string, Required<ResolverObject>>()
+
+  for (const nameOrRecordOrObject of resolverArray) {
+    if (typeof nameOrRecordOrObject === 'string') {
+      const name = nameOrRecordOrObject
+
+      map.set(name, {
+        name,
+        enable: true,
+        options: undefined,
+        resolver: requireResolver(name, sourceFile),
+      })
+    } else if (typeof nameOrRecordOrObject === 'object') {
+      if (nameOrRecordOrObject.name && nameOrRecordOrObject.resolver) {
+        const object = nameOrRecordOrObject as ResolverObject
+
+        const { name, enable = true, options, resolver } = object
+        map.set(name, { name, enable, options, resolver })
+      } else {
+        const record = nameOrRecordOrObject as ResolverRecord
+
+        for (const [name, enableOrOptions] of Object.entries(record)) {
+          if (typeof enableOrOptions === 'boolean') {
+            map.set(name, {
+              name,
+              enable: enableOrOptions,
+              options: undefined,
+              resolver: requireResolver(name, sourceFile),
+            })
+          } else {
+            map.set(name, {
+              name,
+              enable: true,
+              options: enableOrOptions,
+              resolver: requireResolver(name, sourceFile),
+            })
+          }
+        }
+      }
+    } else {
+      const err = new Error('invalid resolver config')
+      err.name = ERROR_NAME
+      throw err
     }
-    return map
   }
 
-  const err = new Error('invalid resolver config')
-  err.name = ERROR_NAME
-  throw err
+  return [...map.values()]
 }
 
 function getBaseDir(sourceFile: string): string {