JS function that waits for dependencies, then calls them.

waitForDeps.js

// Define function.
function waitForDeps(obj, list) {
    // Expose promise.
    return new Promise((resolve) => {
        // Start polling.
        const interval = setInterval(() => {
            // Get missing.
            const listMissing = list.filter(key => !obj[key]);

            // All clear?
            if (listMissing.length === 0) {
                // Clear polling.
                clearInterval(interval);

                // Resolve promise.
                resolve();
            }
        }, 1000);
    });
}

// Example usage:
const depsObj = {};
const depsList = ['hey', 'iJustMetYou', 'thisIsCrazy', 'heresMyNumber', 'callMeMaybe'];

// Simulate delay.
setTimeout(() => {
    // Loop through.
    for (const key of depsList) {
        // Add function.
        depsObj[key] = () => console.log(key);
    }
}, 1000);

// Wait for deps.
waitForDeps(depsObj, depsList).then(() => {
    // Loop through.
    for (const method of Object.values(depsObj)) {
        // Call function.
        method();
    }
});