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javascriptnode.jsunit-testingava

Function.prototype.apply was called on #<Object>, which is a object and not a function

I am using node-js and I have this line of code in a file called utils.js:

const spartial = (func, ...args) => (...rest) => func(...args, ...rest);

The file App.js contains a class called App and this class is using the spartial function in utils.js.

I have written a unit test using the ava library which tests App.js, and when I run the test, I get this error:

Function.prototype.apply was called on #<Object>, which is a object and not a function

and the following line of code is highlighted in red...

 1: const spartial = (func, ...args) => (...rest) => func(...args, ...rest);

Does anyone have any idea what is happening here and how I can fix this? I'm not sure if it is the unit test library or not that is causing the issue, but when I run node utils.js I don't get any error.

Solution

  • This was entirely because I called the spartial function with the paramaters in the wrong order. I don't know how I didn't see this after looking at it for an hour.