@frauschert/ts-guard/lib/guards/isPromise/isPromise.js

ts-guard is a typescript library that provides composable type guards. Its inspired by zod but focusses only on type guards and is more lightweight.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isPromise = isPromise;
function isPromise(valueGuard) {
    return (value) => {
        if (!(typeof value === "object" && value !== null &&
            typeof value.then === "function" &&
            typeof value.catch === "function")) {
            return false;
        }
        if (!valueGuard) {
            return true;
        }
        const promise = value;
        return promise.then((resolvedValue) => valueGuard(resolvedValue), () => false);
    };
}
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