test: test import-x and flat config support correctly

.changeset/beige-gorillas-hunt.md

@@ -0,0 +1,5 @@
+---
+"eslint-import-resolver-typescript": patch
+---
+
+fix: support multiple matching ts paths

.eslintrc

@@ -4,7 +4,8 @@
     "node": true
   },
   "parserOptions": {
-    "ecmaVersion": "latest"
+    "ecmaVersion": "latest",
+    "sourceType": "module"
   },
   "extends": [
     "plugin:prettier/recommended",

.nvmrc

@@ -1 +1 @@
-18.20.6
+18.20.7

package.json

@@ -54,7 +54,7 @@
     "test:dotInclude": "eslint --ext ts,tsx tests/dotInclude --ignore-pattern \"!.dot\"",
     "test:dotPaths": "eslint --ext ts,tsx tests/dotPaths --ignore-pattern \"!.dot\"",
     "test:dotProject": "eslint --ext ts,tsx tests/dotProject --ignore-pattern \"!.dot\"",
-    "test:importXResolverV3": "eslint --config=tests/importXResolverV3/eslint.config.js tests/importXResolverV3",
+    "test:importXResolverV3": "cross-env ESLINT_USE_FLAT_CONFIG=true eslint --config=tests/importXResolverV3/eslint.config.js tests/importXResolverV3",
     "test:multipleEslintrcs": "eslint --ext ts,tsx tests/multipleEslintrcs",
     "test:multipleTsconfigs": "eslint --ext ts,tsx tests/multipleTsconfigs",
     "test:withJsExtension": "node tests/withJsExtension/test.js && eslint --ext ts,tsx tests/withJsExtension",
@@ -98,6 +98,7 @@
     "@types/debug": "^4.1.12",
     "@types/node": "^18.19.78",
     "@types/unist": "^2.0.11",
+    "cross-env": "^7.0.3",
     "dummy.js": "link:dummy.js",
     "eslint": "^8.57.1",
     "eslint-import-resolver-typescript": "link:.",
@@ -111,7 +112,7 @@
     "size-limit": "^11.0.0",
     "size-limit-preset-node-lib": "^0.3.0",
     "type-coverage": "^2.27.0",
-    "typescript": "^5.3.2"
+    "typescript": "~5.1.0"
   },
   "resolutions": {
     "eslint-import-resolver-typescript": "link:.",

src/index.ts

@@ -181,22 +181,30 @@ export function resolve(
 
   initMappers(cachedOptions)
 
-  const mappedPath = getMappedPath(source, file, cachedOptions.extensions, true)
-  if (mappedPath) {
-    log('matched ts path:', mappedPath)
+  let mappedPaths = getMappedPaths(source, file, cachedOptions.extensions, true)
+
+  if (mappedPaths.length > 0) {
+    log('matched ts path:', ...mappedPaths)
+  } else {
+    mappedPaths = [source]
   }
 
   // note that even if we map the path, we still need to do a final resolve
-  let foundNodePath: string | null
-  try {
-    foundNodePath =
-      resolver.resolveSync(
+  let foundNodePath: string | undefined
+  for (const mappedPath of mappedPaths) {
+    try {
+      const resolved = resolver.resolveSync(
         {},
         path.dirname(path.resolve(file)),
-        mappedPath ?? source,
-      ) || null
-  } catch {
-    foundNodePath = null
+        mappedPath,
+      )
+      if (resolved) {
+        foundNodePath = resolved
+        break
+      }
+    } catch {
+      log('failed to resolve with', mappedPath)
+    }
   }
 
   // naive attempt at `@types/*` resolution,
@@ -286,16 +294,16 @@ const isModule = (modulePath?: string | undefined): modulePath is string => {
  * @returns The mapped path of the module or undefined
  */
 // eslint-disable-next-line sonarjs/cognitive-complexity
-function getMappedPath(
+function getMappedPaths(
   source: string,
   file: string,
   extensions: string[] = defaultExtensions,
   retry?: boolean,
-): string | undefined {
+): string[] {
   const originalExtensions = extensions
   extensions = ['', ...extensions]
 
-  let paths: Array<string | undefined> | undefined = []
+  let paths: string[] = []
 
   if (RELATIVE_PATH_PATTERN.test(source)) {
     const resolved = path.resolve(path.dirname(file), source)
@@ -341,34 +349,35 @@ function getMappedPath(
       const tsExt = jsExt.replace('js', 'ts')
       const basename = source.replace(JS_EXT_PATTERN, '')
 
-      const resolved =
-        getMappedPath(basename + tsExt, file) ||
-        getMappedPath(
-          basename + '.d' + (tsExt === '.tsx' ? '.ts' : tsExt),
-          file,
-        )
+      const mappedPaths = getMappedPaths(basename + tsExt, file)
 
-      if (resolved) {
+      const resolved =
+        mappedPaths.length > 0
+          ? mappedPaths
+          : getMappedPaths(
+              basename + '.d' + (tsExt === '.tsx' ? '.ts' : tsExt),
+              file,
+            )
+
+      if (resolved.length > 0) {
         return resolved
       }
     }
 
     for (const ext of extensions) {
+      const mappedPaths = isJs ? [] : getMappedPaths(source + ext, file)
       const resolved =
-        (isJs ? null : getMappedPath(source + ext, file)) ||
-        getMappedPath(source + `/index${ext}`, file)
+        mappedPaths.length > 0
+          ? mappedPaths
+          : getMappedPaths(source + `/index${ext}`, file)
 
-      if (resolved) {
+      if (resolved.length > 0) {
         return resolved
       }
     }
   }
 
-  if (paths.length > 1) {
-    log('found multiple matching ts paths:', paths)
-  }
-
-  return paths[0]
+  return paths
 }
 
 // eslint-disable-next-line sonarjs/cognitive-complexity

tests/importXResolverV3/eslint.config.js

@@ -1,20 +1,31 @@
 const path = require('path')
-const { createTypeScriptImportResolver } = require('../../lib/index.cjs')
+const importX = require('eslint-plugin-import-x')
+
+const { createTypeScriptImportResolver } = require('../..')
 
 const globPattern = './packages/*/tsconfig.json'
 
 // in normal cases this is not needed because the __dirname would be the root
 const absoluteGlobPath = path.join(__dirname, globPattern)
 
-module.exports = {
-  ...require('eslint-plugin-import-x').flatConfigs.typescript,
-  settings: {
-    ...require('eslint-plugin-import-x').flatConfigs.typescript.settings,
-    'import-x/resolver-next': [
-      createTypeScriptImportResolver({
-        project: absoluteGlobPath,
-        alwaysTryTypes: true,
-      }),
-    ],
-  },
-}
+const base = require('../baseEslintConfig.cjs')()
+
+module.exports =
+  // don't run on node 16 because lacking of `structuredClone`
+  +process.versions.node.split('.')[0] <= 16
+    ? {}
+    : {
+        files: ['**/*.ts', '**/*.tsx'],
+        plugins: {
+          import: importX,
+        },
+        settings: {
+          ...importX.flatConfigs.typescript.settings,
+          'import-x/resolver-next': [
+            createTypeScriptImportResolver({
+              project: absoluteGlobPath,
+            }),
+          ],
+        },
+        rules: base.rules,
+      }

yarn.lock

@@ -2268,14 +2268,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@changesets/types@npm:^6.0.0":
-  version: 6.0.0
-  resolution: "@changesets/types@npm:6.0.0"
-  checksum: 214c58ff3e3da019c578b94815ec6748729a38b665d950acddf53f3a23073ac7a57dce45812c4bec0cbcd6902c84a482c804457d4c903602005b2399de8a4021
-  languageName: node
-  linkType: hard
-
-"@changesets/types@npm:^6.1.0":
+"@changesets/types@npm:^6.0.0, @changesets/types@npm:^6.1.0":
   version: 6.1.0
   resolution: "@changesets/types@npm:6.1.0"
   checksum: 2dcd00712cb85d0c53afdd8d0e856b4bf9c0ce8dc36c838c918d44799aacd9ba8659b9ff610ff92b94fc03c8fd2b52c5b05418fcf8a1bd138cd9182414ede373
@@ -3731,16 +3724,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:^18.0.0":
-  version: 18.19.74
-  resolution: "@types/node@npm:18.19.74"
-  dependencies:
-    undici-types: "npm:~5.26.4"
-  checksum: 2306bd0b41cdd528b890b210b96f287a5b5035c128f62636057d6616bd612b3f53d32d77f7e76ef41a9f130ea691e6980e6d5942dd625df05d3a641764fddb78
-  languageName: node
-  linkType: hard
-
-"@types/node@npm:^18.19.78":
+"@types/node@npm:^18.0.0, @types/node@npm:^18.19.78":
   version: 18.19.78
   resolution: "@types/node@npm:18.19.78"
   dependencies:
@@ -5373,6 +5357,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"cross-env@npm:^7.0.3":
+  version: 7.0.3
+  resolution: "cross-env@npm:7.0.3"
+  dependencies:
+    cross-spawn: "npm:^7.0.1"
+  bin:
+    cross-env: src/bin/cross-env.js
+    cross-env-shell: src/bin/cross-env-shell.js
+  checksum: e99911f0d31c20e990fd92d6fd001f4b01668a303221227cc5cb42ed155f086351b1b3bd2699b200e527ab13011b032801f8ce638e6f09f854bdf744095e604c
+  languageName: node
+  linkType: hard
+
 "cross-spawn@npm:^6.0.5":
   version: 6.0.5
   resolution: "cross-spawn@npm:6.0.5"
@@ -5386,7 +5382,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.2, cross-spawn@npm:^7.0.3, cross-spawn@npm:^7.0.5":
+"cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.1, cross-spawn@npm:^7.0.2, cross-spawn@npm:^7.0.3, cross-spawn@npm:^7.0.5":
   version: 7.0.6
   resolution: "cross-spawn@npm:7.0.6"
   dependencies:
@@ -6169,6 +6165,7 @@ __metadata:
     "@types/debug": "npm:^4.1.12"
     "@types/node": "npm:^18.19.78"
     "@types/unist": "npm:^2.0.11"
+    cross-env: "npm:^7.0.3"
     debug: "npm:^4.3.7"
     dummy.js: "link:dummy.js"
     enhanced-resolve: "npm:^5.15.0"
@@ -6188,7 +6185,7 @@ __metadata:
     stable-hash: "npm:^0.0.4"
     tinyglobby: "npm:^0.2.12"
     type-coverage: "npm:^2.27.0"
-    typescript: "npm:^5.3.2"
+    typescript: "npm:~5.1.0"
   peerDependencies:
     eslint: "*"
     eslint-plugin-import: "*"
@@ -13873,6 +13870,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:~5.1.0":
+  version: 5.1.6
+  resolution: "typescript@npm:5.1.6"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: f347cde665cf43dc4c1c7d9821c7d9bbec3c3914f4bdd82ee490e9fb9f6d99036ed8666463b6a192dd005eeef333c5087d5931bdd51ec853436ff9a670a7417e
+  languageName: node
+  linkType: hard
+
 "typescript@patch:typescript@npm%3A^4.6.4 || ^5.2.2#optional!builtin<compat/typescript>, typescript@patch:typescript@npm%3A^5.3.2#optional!builtin<compat/typescript>":
   version: 5.3.2
   resolution: "typescript@patch:typescript@npm%3A5.3.2#optional!builtin<compat/typescript>::version=5.3.2&hash=e012d7"
@@ -13883,6 +13890,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@patch:typescript@npm%3A~5.1.0#optional!builtin<compat/typescript>":
+  version: 5.1.6
+  resolution: "typescript@patch:typescript@npm%3A5.1.6#optional!builtin<compat/typescript>::version=5.1.6&hash=5da071"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: f5481fa3ba0eee8970f46708d13c05650a865ad093b586fc9573f425c64c57ca97e3308e110bb528deb3ccebe83f6fd7b5a8ac90018038da96326a9ccdf8e77c
+  languageName: node
+  linkType: hard
+
 "unassert@npm:^2.0.0, unassert@npm:^2.0.2":
   version: 2.0.2
   resolution: "unassert@npm:2.0.2"