fix: hash the options for the cache instead. 🤷

Author: anomiex

.changeset/slick-breads-feel.md

@@ -2,4 +2,4 @@
 "eslint-import-resolver-typescript": patch
 ---
 
-fix: only cache filename lookup, not options
+fix: include options hash in cache key for options normalization

src/normalize-options.ts

@@ -1,3 +1,4 @@
+import { stableHash } from 'stable-hash-x'
 import { globSync, isDynamicPattern } from 'tinyglobby'
 import type { TsconfigOptions } from 'unrs-resolver'
 
@@ -16,7 +17,7 @@ import type { TypeScriptResolverOptions } from './types.js'
 
 export let defaultConfigFile: string
 
-const configFileMapping = new Map<string, string>()
+const configFileMapping = new Map<string, TypeScriptResolverOptions>()
 
 let warned: boolean | undefined
 
@@ -76,18 +77,24 @@ export function normalizeOptions(
     ensured = true
   }
 
+  const optionsHash = stableHash(options)
   if (configFile) {
-    let cachedConfigFile: string | undefined = configFileMapping.get(configFile)
-    if (cachedConfigFile) {
-      log('using cached config file for', configFile)
-      configFile = cachedConfigFile
-    } else if (!ensured && configFile !== defaultConfigFile) {
-      cachedConfigFile = tryFile(DEFAULT_TRY_PATHS, false, configFile)
-      configFileMapping.set(configFile, cachedConfigFile)
-      configFile = cachedConfigFile
+    const cachedOptions = configFileMapping.get(`${configFile}\0${optionsHash}`)
+    if (cachedOptions) {
+      log(
+        'using cached options for',
+        configFile,
+        'with options hash',
+        optionsHash,
+      )
+      return cachedOptions
     }
   }
 
+  if (!ensured && configFile && configFile !== defaultConfigFile) {
+    configFile = tryFile(DEFAULT_TRY_PATHS, false, configFile)
+  }
+
   options = {
     conditionNames: defaultConditionNames,
     extensions: defaultExtensions,
@@ -100,5 +107,9 @@ export function normalizeOptions(
       : undefined,
   }
 
+  if (configFile) {
+    configFileMapping.set(`${configFile}\0${optionsHash}`, options)
+  }
+
   return options
 }