diff --git a/typings/index.d.ts b/typings/index.d.ts
index b778aa7fa..a5716cecd 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -520,11 +520,17 @@ declare namespace CodeceptJS {
 }
 }
 
+type TryTo = <t>(fn: () => Promise<t> &#124; T) => Promise<t &#124; false>;
+type HopeThat = <t>(fn: () => Promise<t> &#124; T) => Promise<t &#124; false>;
+type RetryTo = <t>(fn: () => Promise<t> &#124; T, retries?: number) => Promise<t>;
+
+
 // Globals
 declare const codecept_dir: string
 declare const output_dir: string
-declare function tryTo(...fn): Promise<boolean>
-declare function retryTo(...fn): Promise<null>
+declare const tryTo: TryTo;
+declare const retryTo: RetryTo;
+declare const hopeThat: HopeThat;
 
 declare const actor: CodeceptJS.actor
 declare const codecept_actor: CodeceptJS.actor
@@ -635,3 +641,9 @@ declare module 'codeceptjs' {
 declare module '@codeceptjs/helper' {
 export = CodeceptJS.Helper
 }
+
+declare module 'codeceptjs/effects' {
+ export const tryTo: TryTo;
+ export const retryTo: RetryTo;
+ export const hopeThat: HopeThat;
+}
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/codeceptjs/CodeceptJS/pull/5094.diff">(-&gt;オリジナル)</a>
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<input type="submit" value="表示" />
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