feat(checks): add isPromise() & isPromiseLike()

thi-ng · Mar 8, 2018 · 9900e99 · 9900e99
1 parent fb4f309
commit 9900e99
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Showing 3 changed files with 11 additions and 0 deletions.
diff --git a/packages/checks/src/index.ts b/packages/checks/src/index.ts
@@ -30,6 +30,8 @@ export * from "./is-object";
 export * from "./is-odd";
 export * from "./is-plain-object";
 export * from "./is-positive";
+export * from "./is-promise";
+export * from "./is-promiselike";
 export * from "./is-regexp";
 export * from "./is-safari";
 export * from "./is-string";

diff --git a/packages/checks/src/is-promise.ts b/packages/checks/src/is-promise.ts
@@ -0,0 +1,3 @@
+export function isPromise(x: any): x is Promise<any> {
+    return x instanceof Promise;
+}
diff --git a/packages/checks/src/is-promiselike.ts b/packages/checks/src/is-promiselike.ts
@@ -0,0 +1,6 @@
+import { implementsFunction } from "./implements-function";
+
+export function isPromiseLike(x: any): x is Promise<any> {
+    return x instanceof Promise ||
+        (implementsFunction(x, "then") && implementsFunction(x, "catch"));
+}