What is the best way to incorporate debugging functionality into a TypeScript project that will be bundled using rollup?

I have been working on an Angular 2 project and encountered no issues while using debug. However, when I attempted to integrate rollup, I faced the following error:

Cannot call a namespace ('debugModule')

This error is related to how I import debug:

import * as debugModule from 'debug';

I discovered that the solution involves importing without using the * as someName syntax, like this:

import debug from 'debug';

Or perhaps:

import { Debug } from 'debug';

...but unfortunately, neither of these methods work (has no default export and has no exported member 'Debug'). After examining both the source code of debug and @types/debug, I only found information in @types/debug - there are IDebug and IDebugger interfaces which do not seem to be what I am looking for.

Could you please advise me on the correct way to import debug so that it works fine with rollup?

It seems that I can temporarily fix it by calling it in this manner:

debug = debugModule.call(this, 'module:component');

However, I am unsure about any potential implications this approach might have in the future...

angulartypescriptrollupjsnpm-debug

Answer №1

For some reason unknown to me, when the @types/debug package is installed, the use of import debug from 'debug' becomes problematic. However, by simply removing the @types/debug package, the import works smoothly. While this solution may not address all issues that arise when using rollup with debug, it does resolve the "Cannot call namespace" error and allows for normal usage of the debug function.

Answer №2

To bring it in, use the following method

import * as debugTool from 'debug';
const debugger = debugTool()

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