After some experimenting, I realized that when using
app.use.apply(null, ['/', f => f]);An unexpected TypeError occurs:
TypeError: Cannot read property 'lazyrouter' of null
at use (node_modules/express/lib/application.js:214:7)
Given that my express app instance is properly configured, what mistake am I making here? Is the correct syntax for app.use([path], cb) being followed?
http://expressjs.com/en/guide/using-middleware.html
When using the apply() method, it will modify the reference of this within the function. As for the app.use() method, the this keyword typically refers to the instance of the app. However, if you set it to null, there is no use function property attached to null, resulting in an error being thrown.
When a function is invoked as a method of an object, for example in the context of app.use([path], cb), the this keyword inside the function will refer to that specific object. To specify this binding explicitly when using the apply method, you would write
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