I am seeing a similar problem on an imported library:

Failed to compile entry-point x-x-x (es2015 as esm2015) due to compilation errors:
node_modules/ngx-socket-io/src/socket-io.module.d.ts:7:22 - error NG6002: Appears in the NgModule.imports of x-x-x, but could not be resolved to an NgModule class

Full Error

at ClusterWorker.compile (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/main.js:177:27)
    at Worker.<anonymous> (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/execution/cluster/worker.js:44:42)
    at Worker.emit (events.js:198:13)
    at process.Worker.process.on (internal/cluster/worker.js:28:12)
    at process.emit (events.js:198:13)
    at emit (internal/child_process.js:832:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at ClusterMaster.onWorkerMessage (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/execution/cluster/master.js:158:27)
    at /Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/execution/cluster/master.js:46:95
    at ClusterMaster.<anonymous> (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/execution/cluster/master.js:238:57)
    at step (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/tslib/tslib.js:136:27)
    at Object.next (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/tslib/tslib.js:117:57)
    at /Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/tslib/tslib.js:110:75
    at new Promise (<anonymous>)
    at Object.__awaiter (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/tslib/tslib.js:106:16)
    at EventEmitter.<anonymous> (/Users/brian.pilati/code/greenseed/prism/prism/prism-core/node_modules/@angular/compiler-cli/ngcc/src/execution/cluster/master.js:232:32)
    at EventEmitter.emit (events.js:198:13)

I'm going to have to either disable Ivy or role back my installation.

This is the file

import { ModuleWithProviders, InjectionToken } from '@angular/core';
import { SocketIoConfig } from './config/socket-io.config';
import { WrappedSocket } from './socket-io.service';
/** Socket factory */
export declare function SocketFactory(config: SocketIoConfig): WrappedSocket;
export declare const SOCKET_CONFIG_TOKEN: InjectionToken<SocketIoConfig>;
export declare class SocketIoModule { <---- LINE 7
    static forRoot(config: SocketIoConfig): ModuleWithProviders;
}

After further reading and research. It appears that Ivy is not ready to compile libraries? Once I disabled Ivy and, I assume, reverted to the view engine ... everything worked.

Will someone please confirm that Ivy is NOT ready to compile libraries and when that support will be ready?

ngcc: is unable to process some minified library formats #35255

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