You're making 2 mistakes

• Wrapping the existing promise-related functionality with your own promise (see: What is the explicit promise construction antipattern and how do I avoid it?)
• Mixing async/await with then

The code can be hugely simplified:

async function LoadBuildId(result) { let url = 'MySecondFancyUrl'; const response = await axios.get(url) result.buildId = response.data; return result; } 

and

async function LoadBasicData() { let url = 'MyFancyUrl'; const response = await axios.get(url); result = await LoadBuildId(result); return result; } 

You're making 2 mistakes

• Wrapping the existing promise-related functionality with your own promise (see: What is the explicit promise construction antipattern and how do I avoid it?)
• Mixing async/await with then

The code can be hugely simplified:

async function LoadBuildId(result) { let url = 'MySecondFancyUrl'; const response = await axios.get(url) result.buildId = response.data; return result; } 

and

async function LoadBasicData() { let url = 'MyFancyUrl'; let result = Object.create(null); const response = await axios.get(url); result = await LoadBuildId(result); return result; } 

To be honest, it can be simplified even further - theres no need to be constructing result objects just to set properties on it - you may as well just return the results from a call to axios.get

You're making 2 mistakes

• Wrapping the existing promise-related functionality with your own promise (see: What is the explicit promise construction antipattern and how do I avoid it?)
• Mixing async/await with then

The code can be hugely simplified:

async function LoadBuildId(result) { let url = 'MySecondFancyUrl'; const response = await axiosget(url) result.buildId = response.data; return result; } 

and

async function LoadBasicData() { let url = 'MyFancyUrl'; const response = await axios.get(url); result = await LoadBuildId(result); return result; } 

You're making 2 mistakes

• Wrapping the existing promise-related functionality with your own promise (see: What is the explicit promise construction antipattern and how do I avoid it?)
• Mixing async/await with then

The code can be hugely simplified:

async function LoadBuildId(result) { let url = 'MySecondFancyUrl'; const response = await axios.get(url) result.buildId = response.data; return result; } 

and

async function LoadBasicData() { let url = 'MyFancyUrl'; const response = await axios.get(url); result = await LoadBuildId(result); return result; }