Resolve tslib re-exports before checking arity

src/compiler/checker.ts

@@ -47042,7 +47042,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                                 if (requestedExternalEmitHelperNames.has(name)) continue;
                                 requestedExternalEmitHelperNames.add(name);
 
-                                const symbol = getSymbol(getExportsOfModule(helpersModule), escapeLeadingUnderscores(name), SymbolFlags.Value);
+                                const symbol = resolveSymbol(getSymbol(getExportsOfModule(helpersModule), escapeLeadingUnderscores(name), SymbolFlags.Value));
                                 if (!symbol) {
                                     error(location, Diagnostics.This_syntax_requires_an_imported_helper_named_1_which_does_not_exist_in_0_Consider_upgrading_your_version_of_0, externalHelpersModuleNameText, name);
                                 }

tests/baselines/reference/tslibReExportHelpers2.js

@@ -0,0 +1,56 @@
+//// [tests/cases/compiler/tslibReExportHelpers2.ts] ////
+
+//// [index.d.ts]
+export declare function __classPrivateFieldGet<T extends object, V>(
+  receiver: T,
+  state: { has(o: T): boolean, get(o: T): V | undefined },
+  kind?: "f"
+): V;
+export declare function __classPrivateFieldGet<T extends new (...args: any[]) => unknown, V>(
+  receiver: T,
+  state: T,
+  kind: "f",
+  f: { value: V }
+): V;
+
+//// [index.d.mts]
+export { __classPrivateFieldGet } from "./index.js";
+
+//// [package.json]
+{
+    "name": "tslib",
+    "version": "1.0.0",
+    "types": "index.d.ts",
+    "exports": {
+        ".": {
+            "types": {
+                "import": "./index.d.mts",
+                "default": "./index.d.ts"
+            }
+        }
+    }
+}
+
+//// [index.mts]
+export class Foo {
+  constructor() {
+    console.log(Foo.#test());
+  }
+
+  static #test() {
+    return 'success';
+  }
+}
+
+
+//// [index.mjs]
+var _a, _Foo_test;
+import { __classPrivateFieldGet } from "tslib";
+export class Foo {
+    constructor() {
+        console.log(__classPrivateFieldGet(Foo, _a, "m", _Foo_test).call(Foo));
+    }
+}
+_a = Foo, _Foo_test = function _Foo_test() {
+    return 'success';
+};

tests/baselines/reference/tslibReExportHelpers2.symbols

@@ -0,0 +1,75 @@
+=== /node_modules/tslib/index.d.ts ===
+export declare function __classPrivateFieldGet<T extends object, V>(
+>__classPrivateFieldGet : Symbol(__classPrivateFieldGet, Decl(index.d.ts, 0, 0), Decl(index.d.ts, 4, 5))
+>T : Symbol(T, Decl(index.d.ts, 0, 47))
+>V : Symbol(V, Decl(index.d.ts, 0, 64))
+
+  receiver: T,
+>receiver : Symbol(receiver, Decl(index.d.ts, 0, 68))
+>T : Symbol(T, Decl(index.d.ts, 0, 47))
+
+  state: { has(o: T): boolean, get(o: T): V | undefined },
+>state : Symbol(state, Decl(index.d.ts, 1, 14))
+>has : Symbol(has, Decl(index.d.ts, 2, 10))
+>o : Symbol(o, Decl(index.d.ts, 2, 15))
+>T : Symbol(T, Decl(index.d.ts, 0, 47))
+>get : Symbol(get, Decl(index.d.ts, 2, 30))
+>o : Symbol(o, Decl(index.d.ts, 2, 35))
+>T : Symbol(T, Decl(index.d.ts, 0, 47))
+>V : Symbol(V, Decl(index.d.ts, 0, 64))
+
+  kind?: "f"
+>kind : Symbol(kind, Decl(index.d.ts, 2, 58))
+
+): V;
+>V : Symbol(V, Decl(index.d.ts, 0, 64))
+
+export declare function __classPrivateFieldGet<T extends new (...args: any[]) => unknown, V>(
+>__classPrivateFieldGet : Symbol(__classPrivateFieldGet, Decl(index.d.ts, 0, 0), Decl(index.d.ts, 4, 5))
+>T : Symbol(T, Decl(index.d.ts, 5, 47))
+>args : Symbol(args, Decl(index.d.ts, 5, 62))
+>V : Symbol(V, Decl(index.d.ts, 5, 89))
+
+  receiver: T,
+>receiver : Symbol(receiver, Decl(index.d.ts, 5, 93))
+>T : Symbol(T, Decl(index.d.ts, 5, 47))
+
+  state: T,
+>state : Symbol(state, Decl(index.d.ts, 6, 14))
+>T : Symbol(T, Decl(index.d.ts, 5, 47))
+
+  kind: "f",
+>kind : Symbol(kind, Decl(index.d.ts, 7, 11))
+
+  f: { value: V }
+>f : Symbol(f, Decl(index.d.ts, 8, 12))
+>value : Symbol(value, Decl(index.d.ts, 9, 6))
+>V : Symbol(V, Decl(index.d.ts, 5, 89))
+
+): V;
+>V : Symbol(V, Decl(index.d.ts, 5, 89))
+
+=== /node_modules/tslib/index.d.mts ===
+export { __classPrivateFieldGet } from "./index.js";
+>__classPrivateFieldGet : Symbol(__classPrivateFieldGet, Decl(index.d.mts, 0, 8))
+
+=== /index.mts ===
+export class Foo {
+>Foo : Symbol(Foo, Decl(index.mts, 0, 0))
+
+  constructor() {
+    console.log(Foo.#test());
+>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
+>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
+>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
+>Foo.#test : Symbol(Foo.#test, Decl(index.mts, 3, 3))
+>Foo : Symbol(Foo, Decl(index.mts, 0, 0))
+  }
+
+  static #test() {
+>#test : Symbol(Foo.#test, Decl(index.mts, 3, 3))
+
+    return 'success';
+  }
+}
+

tests/baselines/reference/tslibReExportHelpers2.types

@@ -0,0 +1,64 @@
+=== /node_modules/tslib/index.d.ts ===
+export declare function __classPrivateFieldGet<T extends object, V>(
+>__classPrivateFieldGet : { <T extends object, V>(receiver: T, state: { has(o: T): boolean; get(o: T): V | undefined; }, kind?: "f"): V; <T extends new (...args: any[]) => unknown, V>(receiver: T, state: T, kind: "f", f: { value: V; }): V; }
+
+  receiver: T,
+>receiver : T
+
+  state: { has(o: T): boolean, get(o: T): V | undefined },
+>state : { has(o: T): boolean; get(o: T): V | undefined; }
+>has : (o: T) => boolean
+>o : T
+>get : (o: T) => V | undefined
+>o : T
+
+  kind?: "f"
+>kind : "f"
+
+): V;
+export declare function __classPrivateFieldGet<T extends new (...args: any[]) => unknown, V>(
+>__classPrivateFieldGet : { <T extends object, V>(receiver: T, state: { has(o: T): boolean; get(o: T): V; }, kind?: "f"): V; <T extends new (...args: any[]) => unknown, V>(receiver: T, state: T, kind: "f", f: {    value: V;}): V; }
+>args : any[]
+
+  receiver: T,
+>receiver : T
+
+  state: T,
+>state : T
+
+  kind: "f",
+>kind : "f"
+
+  f: { value: V }
+>f : { value: V; }
+>value : V
+
+): V;
+
+=== /node_modules/tslib/index.d.mts ===
+export { __classPrivateFieldGet } from "./index.js";
+>__classPrivateFieldGet : { <T extends object, V>(receiver: T, state: { has(o: T): boolean; get(o: T): V; }, kind?: "f"): V; <T extends new (...args: any[]) => unknown, V>(receiver: T, state: T, kind: "f", f: { value: V; }): V; }
+
+=== /index.mts ===
+export class Foo {
+>Foo : Foo
+
+  constructor() {
+    console.log(Foo.#test());
+>console.log(Foo.#test()) : void
+>console.log : (...data: any[]) => void
+>console : Console
+>log : (...data: any[]) => void
+>Foo.#test() : string
+>Foo.#test : () => string
+>Foo : typeof Foo
+  }
+
+  static #test() {
+>#test : () => string
+
+    return 'success';
+>'success' : "success"
+  }
+}
+

tests/cases/compiler/tslibReExportHelpers2.ts

@@ -0,0 +1,45 @@
+// @module: nodenext
+// @importHelpers: true
+// @target: es2021
+
+// @Filename: /node_modules/tslib/index.d.ts
+export declare function __classPrivateFieldGet<T extends object, V>(
+  receiver: T,
+  state: { has(o: T): boolean, get(o: T): V | undefined },
+  kind?: "f"
+): V;
+export declare function __classPrivateFieldGet<T extends new (...args: any[]) => unknown, V>(
+  receiver: T,
+  state: T,
+  kind: "f",
+  f: { value: V }
+): V;
+
+// @Filename: /node_modules/tslib/index.d.mts
+export { __classPrivateFieldGet } from "./index.js";
+
+// @Filename: /node_modules/tslib/package.json
+{
+    "name": "tslib",
+    "version": "1.0.0",
+    "types": "index.d.ts",
+    "exports": {
+        ".": {
+            "types": {
+                "import": "./index.d.mts",
+                "default": "./index.d.ts"
+            }
+        }
+    }
+}
+
+// @Filename: /index.mts
+export class Foo {
+  constructor() {
+    console.log(Foo.#test());
+  }
+
+  static #test() {
+    return 'success';
+  }
+}