Strange failure during the build process

Encountering a strange error while attempting to compile an angular 4 app. Here's the issue below:

 Class extends value undefined is not a constructor or null
TypeError: Class extends value undefined is not a constructor or null
    at Object.<anonymous> (/home/ptdave/projects/sidr-ts/node_modules/@angular/cli/plugins/named-lazy-chunks-webpack-plugin.js:9:51)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/ptdave/projects/sidr-ts/node_modules/@angular/cli/models/webpack-configs/common.js:6:44)
    at Module._compile (module.js:571:32)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:488:32)
    at tryModuleLoad (module.js:447:12)
    at Function.Module._load (module.js:439:3)
    at Module.require (module.js:498:17)
    at require (internal/module.js:20:19)

I'm feeling stuck on how to troubleshoot this issue. I've even tried removing my node-modules folder, but haven't been able to resolve it.

angulartypescript

Answer №1

This situation occurs when you have a class that inherits from another class that has not been initialized yet. Typically, this happens due to circular dependencies between the classes.

a.js

import {c} from c.js
export class a {}

b.js 

import {a} from a.js
export class b { }

c.js

import {b} from b.js
export class c extends b{}

Answer №2

After some investigation, I managed to uncover the root of the problem. It appears that webpack from angular-cli was missing in my package.json file. When I attempted to start a new node_modules, it caused further complications. Nevertheless, I appreciate the attempts to help me solve the issue.

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