feat: add bun built-in modules support

Author: SukkaW

Diff for: package.json

@@ -51,6 +51,7 @@
     "prepare": "simple-git-hooks",
     "release": "changeset publish",
     "test": "run-p 'test:*'",
+    "test:bun": "eslint --ext ts,tsx tests/bun",
     "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",

Diff for: src/index.ts

@@ -117,6 +117,29 @@ let resolver: Resolver | undefined
 const digestHashObject = (value: object | null | undefined) =>
   hashObject(value ?? {}).digest('hex')
 
+let bunCoreModules: Set<string> | undefined
+const getBunCoreModules = (): Set<string> => {
+  if (!bunCoreModules) {
+    bunCoreModules = new Set<string>()
+
+    const { found, path } = resolve('bun-types', 'bun-types')
+    if (found && path) {
+      const regex = /declare module ["'](bun:\w+)["']/g
+      const content = fs.readFileSync(path, 'utf8')
+      let match: RegExpExecArray | null
+
+      while ((match = regex.exec(content)) !== null) {
+        // The first captured group is at index 1
+        if (match[1]) {
+          bunCoreModules.add(match[1])
+        }
+      }
+    }
+  }
+
+  return bunCoreModules
+}
+
 /**
  * @param source the module to resolve; i.e './some-module'
  * @param file the importing file's full path; i.e. '/usr/local/bin/file.js'
@@ -169,6 +192,16 @@ export function resolve(
     }
   }
 
+  // match against bun core modules
+  if (getBunCoreModules().has(source)) {
+    log('matched bun core:', source)
+
+    return {
+      found: true,
+      path: null,
+    }
+  }
+
   initMappers(cachedOptions)
 
   const mappedPath = getMappedPath(source, file, cachedOptions.extensions, true)

Diff for: tests/bun/.eslintrc.cjs

@@ -0,0 +1 @@
+module.exports = require('../baseEslintConfig.cjs')(__dirname)

Diff for: tests/bun/index.ts

@@ -0,0 +1,5 @@
+/* eslint-disable */
+// @ts-expect-error
+import { Database } from 'bun:sqlite'
+
+export default new Database()

Diff for: tests/bun/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "compilerOptions": {},
+  "files": ["index.ts"]
+}

Diff for: tsconfig.json

@@ -4,5 +4,6 @@
     "module": "Node16",
     "outDir": "./lib"
   },
-  "include": ["./src", "./shim.d.ts"]
+  "include": ["./src", "./shim.d.ts"],
+  "exclude": ["./node_modules/bun-types/**/*"]
 }