fix: add support for jsconfig.json (#73)

package.json

@@ -82,6 +82,7 @@
     "test": "run-p test:*",
     "test:multipleEslintrcs": "eslint --ext ts,tsx tests/multipleEslintrcs",
     "test:multipleTsconfigs": "eslint --ext ts,tsx tests/multipleTsconfigs",
+    "test:withJsconfig": "eslint --ext js tests/withJsconfig",
     "test:withJsExtension": "node tests/withJsExtension/test.js && eslint --ext ts,tsx tests/withJsExtension",
     "test:withPaths": "eslint --ext ts,tsx tests/withPaths",
     "test:withPathsAndNestedBaseUrl": "eslint --ext ts,tsx tests/withPathsAndNestedBaseUrl",

src/index.ts

@@ -10,6 +10,7 @@ import {
   ResolverFactory,
 } from 'enhanced-resolve'
 import { createPathsMatcher, getTsconfig } from 'get-tsconfig'
+import type { TsConfigResult } from 'get-tsconfig'
 import isCore from 'is-core-module'
 import isGlob from 'is-glob'
 import { createSyncFn } from 'synckit'
@@ -333,7 +334,15 @@ function initMappers(options: InternalResolverOptions) {
   ]
 
   mappers = projectPaths.map(projectPath => {
-    const tsconfigResult = getTsconfig(projectPath)
+    let tsconfigResult: TsConfigResult | null
+
+    if (isFile(projectPath)) {
+      const { dir, base } = path.parse(projectPath)
+      tsconfigResult = getTsconfig(dir, base)
+    } else {
+      tsconfigResult = getTsconfig(projectPath)
+    }
+
     return tsconfigResult && createPathsMatcher(tsconfigResult)
   })
 

tests/withJsconfig/.eslintrc.cjs

@@ -0,0 +1,5 @@
+const path = require('path')
+
+const configPath = path.join(__dirname, 'jsconfig.json')
+
+module.exports = require('../baseEslintConfig.cjs')(configPath)

tests/withJsconfig/importee.js

@@ -0,0 +1 @@
+export default 'importee'

tests/withJsconfig/index.js

@@ -0,0 +1,2 @@
+// import using jsconfig.json path mapping
+import '#/importee'

tests/withJsconfig/jsconfig.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "baseUrl": "./",
+    "paths": {
+      "#/*": ["*"]
+    }
+  }
+}