Exclude array/tuple properties from expected named exports

.changeset/clever-ghosts-begin.md

@@ -0,0 +1,5 @@
+---
+"@arethetypeswrong/core": patch
+---
+
+Exclude array/tuple properties from expected named exports

packages/core/src/internal/checks/namedExports.ts

@@ -38,6 +38,10 @@ export default defineCheck({
     }
 
     const typeChecker = host.createAuxiliaryProgram([typesFileName]).getTypeChecker();
+    const moduleType = typeChecker.getTypeOfSymbol(typeChecker.resolveExternalModuleSymbol(typesSourceFile.symbol));
+    if (typeChecker.isArrayLikeType(moduleType) || typeChecker.getPropertyOfType(moduleType, "0")) {
+      return;
+    }
     const expectedNames = Array.from(
       new Set(
         typeChecker

packages/core/src/internal/minimalLibDts.ts

@@ -0,0 +1,78 @@
+// The contents of this string are derived from typescript/lib/lib.es5.d.ts.
+// These types are all that are needed for the NamedExports check to work.
+
+/*! *****************************************************************************
+Copyright (c) Microsoft Corporation. All rights reserved.
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at http://www.apache.org/licenses/LICENSE-2.0
+
+THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+MERCHANTABLITY OR NON-INFRINGEMENT.
+
+See the Apache Version 2.0 License for specific language governing permissions
+and limitations under the License.
+***************************************************************************** */
+export default `
+interface ReadonlyArray<T> {
+  readonly length: number;
+  toString(): string;
+  toLocaleString(): string;
+  concat(...items: ConcatArray<T>[]): T[];
+  concat(...items: (T | ConcatArray<T>)[]): T[];
+  join(separator?: string): string;
+  slice(start?: number, end?: number): T[];
+  indexOf(searchElement: T, fromIndex?: number): number;
+  lastIndexOf(searchElement: T, fromIndex?: number): number;
+  every<S extends T>(predicate: (value: T, index: number, array: readonly T[]) => value is S, thisArg?: any): this is readonly S[];
+  every(predicate: (value: T, index: number, array: readonly T[]) => unknown, thisArg?: any): boolean;
+  some(predicate: (value: T, index: number, array: readonly T[]) => unknown, thisArg?: any): boolean;
+  forEach(callbackfn: (value: T, index: number, array: readonly T[]) => void, thisArg?: any): void;
+  map<U>(callbackfn: (value: T, index: number, array: readonly T[]) => U, thisArg?: any): U[];
+  filter<S extends T>(predicate: (value: T, index: number, array: readonly T[]) => value is S, thisArg?: any): S[];
+  filter(predicate: (value: T, index: number, array: readonly T[]) => unknown, thisArg?: any): T[];
+  reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: readonly T[]) => T): T;
+  reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: readonly T[]) => T, initialValue: T): T;
+  reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: readonly T[]) => U, initialValue: U): U;
+  reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: readonly T[]) => T): T;
+  reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: readonly T[]) => T, initialValue: T): T;
+  reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: readonly T[]) => U, initialValue: U): U;
+  readonly [n: number]: T;
+}
+
+interface Array<T> {
+  length: number;
+  toString(): string;
+  toLocaleString(): string;
+  pop(): T | undefined;
+  push(...items: T[]): number;
+  concat(...items: ConcatArray<T>[]): T[];
+  concat(...items: (T | ConcatArray<T>)[]): T[];
+  join(separator?: string): string;
+  reverse(): T[];
+  shift(): T | undefined;
+  slice(start?: number, end?: number): T[];
+  sort(compareFn?: (a: T, b: T) => number): this;
+  splice(start: number, deleteCount?: number): T[];
+  splice(start: number, deleteCount: number, ...items: T[]): T[];
+  unshift(...items: T[]): number;
+  indexOf(searchElement: T, fromIndex?: number): number;
+  lastIndexOf(searchElement: T, fromIndex?: number): number;
+  every<S extends T>(predicate: (value: T, index: number, array: T[]) => value is S, thisArg?: any): this is S[];
+  every(predicate: (value: T, index: number, array: T[]) => unknown, thisArg?: any): boolean;
+  some(predicate: (value: T, index: number, array: T[]) => unknown, thisArg?: any): boolean;
+  forEach(callbackfn: (value: T, index: number, array: T[]) => void, thisArg?: any): void;
+  map<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[];
+  filter<S extends T>(predicate: (value: T, index: number, array: T[]) => value is S, thisArg?: any): S[];
+  filter(predicate: (value: T, index: number, array: T[]) => unknown, thisArg?: any): T[];
+  reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
+  reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
+  reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
+  reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T): T;
+  reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue: T): T;
+  reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U;
+  [n: number]: T;
+}
+`;

packages/core/src/internal/multiCompilerHost.ts

@@ -1,5 +1,6 @@
 import ts from "typescript";
 import { LRUCache } from "lru-cache";
+import minimalLibDts from "./minimalLibDts.js";
 import type { ModuleKind } from "../types.js";
 import type { Package } from "../createPackage.js";
 
@@ -225,7 +226,7 @@ export class CompilerHostWrapper {
         if (cached) {
           return cached;
         }
-        const content = fileName.startsWith("/node_modules/typescript/lib") ? "" : fs.tryReadFile(fileName);
+        const content = fileName === "/node_modules/typescript/lib/lib.d.ts" ? minimalLibDts : fs.tryReadFile(fileName);
         if (content === undefined) {
           return undefined;
         }