sfccxt
Version:
A JavaScript / Python / PHP cryptocurrency trading library with support for 130+ exchanges
57 lines (37 loc) • 1.92 kB
JavaScript
/* eslint-disable */
;
const errorHierarchy = require ('./errorHierarchy.js')
/* ------------------------------------------------------------------------ */
function subclass (BaseClass, classes, namespace = {}) {
for (const [className, subclasses] of Object.entries (classes)) {
const Class = Object.assign (namespace, {
/* By creating a named property, we trick compiler to assign our class constructor function a name.
Otherwise, all our error constructors would be shown as [Function: Error] in the debugger! And
the super-useful `e.constructor.name` magic wouldn't work — we then would have no chance to
obtain a error type string from an error instance programmatically! */
[className]: class extends BaseClass {
constructor (message) {
super (message)
/* A workaround to make `instanceof` work on custom Error classes in transpiled ES5.
See my blog post for the explanation of this hack:
https://medium.com/@xpl/javascript-deriving-from-error-properly-8d2f8f315801 */
this.constructor = Class
this.__proto__ = Class.prototype
this.name = className
this.message = message
// https://github.com/Microsoft/TypeScript/wiki/FAQ#why-doesnt-extending-built-ins-like-error-array-and-map-work
Object.setPrototypeOf (this, Class.prototype)
}
}
})[className]
subclass (Class, subclasses, namespace)
}
return namespace
}
/* ------------------------------------------------------------------------ */
module.exports = subclass (
// Root class
Error,
// Derived class hierarchy
errorHierarchy
)