diff --git a/src/api/scripting/methods.ts b/src/api/scripting/methods.ts
index 2f5e9a4..38c3d88 100644
--- a/src/api/scripting/methods.ts
+++ b/src/api/scripting/methods.ts
@@ -1,7 +1,8 @@
 import {browser} from "../browser";
 import {callWithPromise} from "../utils";
 
-type Awaited<T> = chrome.scripting.Awaited<T>;
+// Keep the result type independent of the removed chrome.scripting.Awaited alias.
+type Awaited<T> = T extends PromiseLike<infer U> ? U : T;
 type ContentScriptFilter = chrome.scripting.ContentScriptFilter;
 type CSSInjection = chrome.scripting.CSSInjection;
 type InjectionResult<T> = chrome.scripting.InjectionResult<T>;
diff --git a/tests/consumer-types/scripting-methods-types.ts b/tests/consumer-types/scripting-methods-types.ts
index ae0da45..320bd57 100644
--- a/tests/consumer-types/scripting-methods-types.ts
+++ b/tests/consumer-types/scripting-methods-types.ts
@@ -1,6 +1,6 @@
 import {executeScript, getRegisteredContentScripts, insertCss, registerContentScripts, removeCss, unregisterContentScripts, updateContentScripts} from "@addon-core/browser";
 
-type Awaited<T> = chrome.scripting.Awaited<T>;
+type Awaited<T> = T extends PromiseLike<infer U> ? U : T;
 type ContentScriptFilter = chrome.scripting.ContentScriptFilter;
 type CSSInjection = chrome.scripting.CSSInjection;
 type InjectionResult<T> = chrome.scripting.InjectionResult<T>;
@@ -20,8 +20,12 @@ type Expected = {
 };
 
 type Equal<A, B> = (<T>() => T extends A ? 1 : 2) extends (<T>() => T extends B ? 1 : 2) ? true : false;
-const signaturesUnchanged: Equal<typeof methods, Expected> = true;
-void [methods, signaturesUnchanged];
+const signaturesUnchanged: Equal<Omit<typeof methods, "executeScript">, Omit<Expected, "executeScript">> = true;
+// Conditional result aliases from different declaration files need assignability checks.
+const compatibleExecuteScript: Expected["executeScript"] = executeScript;
+declare const expectedExecuteScript: Expected["executeScript"];
+const compatibleExpected: typeof executeScript = expectedExecuteScript;
+void [methods, signaturesUnchanged, compatibleExecuteScript, compatibleExpected];
 
 const pending: Promise<chrome.scripting.InjectionResult<number>[]> = executeScript<Promise<number>>({target: {tabId: 7}, func: async () => 42});
 void pending;