try v5

.eslintrc.json

@@ -16,7 +16,7 @@
       ],
       "parserOptions": {
         "project": [
-          "tsconfig.json"
+          "projects/common-ui/tsconfig.json"
         ]
       },
       "rules": {
@@ -82,6 +82,7 @@
         "no-underscore-dangle": "off",
         "no-param-reassign": "error",
         "no-dupe-class-members": "off",
+        "no-redeclare": "off",
         "consistent-return": "off",
         "@typescript-eslint/restrict-template-expressions": "off",
         "@typescript-eslint/lines-between-class-members": "off"

src/lib/buttons/help-button/help-button.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @angular-eslint/prefer-on-push-component-change-detection */
 import { Component, Input, OnDestroy, OnInit } from '@angular/core';
 import { HelpModeService } from '@iqser/common-ui';
 
@@ -17,7 +18,7 @@ export class HelpButtonComponent implements OnInit, OnDestroy {
     }
 
     ngOnDestroy(): void {
-        this._helpModeService.helpButtonKey = null;
+        this._helpModeService.helpButtonKey = undefined;
     }
 
     activateHelpMode(): void {

src/lib/filtering/single-filter/single-filter.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @angular-eslint/prefer-on-push-component-change-detection */
 import { Component, Input } from '@angular/core';
 import { FilterService } from '../filter.service';
 import { IFilter } from '../models/filter.model';

src/lib/help-mode/help-mode.service.ts

@@ -27,18 +27,15 @@ interface Helper {
     providedIn: 'root',
 })
 export class HelpModeService {
+    helpButtonKey: string | undefined;
     private readonly _isHelpModeActive$ = new BehaviorSubject(false);
     readonly isHelpModeActive$ = this._isHelpModeActive$.asObservable();
     private readonly _helpModeDialogIsOpened$ = new BehaviorSubject(false);
     readonly helpModeDialogIsOpened$ = this._helpModeDialogIsOpened$.asObservable();
-
     private readonly _helperElements: Record<string, Helper> = {};
     private readonly _renderer: Renderer2;
-
     private _dialogMode = false;
 
-    helpButtonKey: string | null = null;
-
     constructor(
         @Inject(HELP_DOCS) private readonly _docs: Record<string, Record<string, string>>,
         @Inject(MANUAL_BASE_URL) private readonly _manualBaseURL: string,
@@ -95,7 +92,7 @@ export class HelpModeService {
     }
 
     highlightHelperElements(): void {
-        Object.values(this._helperElements).forEach(({ element, helperElement }) => {
+        Object.values(this._helperElements).forEach(({ helperElement }) => {
             this._renderer.addClass(helperElement, 'help-highlight');
             setTimeout(() => {
                 this._renderer.removeClass(helperElement, 'help-highlight');

src/lib/inputs/form-field/form-field-component.directive.ts

@@ -12,6 +12,7 @@ export abstract class FormFieldComponent<I> implements ControlValueAccessor, Val
         return this._value;
     }
 
+    // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
     onChange = (value?: I) => {};
 
     onTouched = () => {};

src/lib/listing/table-content/table-content.component.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @angular-eslint/prefer-on-push-component-change-detection */
 import { AfterViewInit, Component, forwardRef, HostListener, Inject, Input, OnDestroy, ViewChild } from '@angular/core';
 import { CdkVirtualScrollViewport } from '@angular/cdk/scrolling';
 import { delay, tap } from 'rxjs/operators';

src/lib/misc/small-chip/small-chip.component.ts

@@ -1,6 +1,7 @@
 import { ChangeDetectionStrategy, Component, Input } from '@angular/core';
 
 @Component({
+    // eslint-disable-next-line @angular-eslint/component-selector
     selector: 'redaction-small-chip [color]',
     templateUrl: './small-chip.component.html',
     styleUrls: ['./small-chip.component.scss'],

src/lib/services/generic.service.ts

@@ -30,7 +30,7 @@ export abstract class GenericService<I> {
     get<T = I[]>(): Observable<T>;
     // eslint-disable-next-line @typescript-eslint/unified-signatures
     get<T = I>(id: string, ...args: unknown[]): Observable<T>;
-    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars, no-unused-vars
     get<T>(id?: string, ...args: unknown[]): Observable<T> {
         return id ? this._getOne<T>([id]) : this.getAll<T>();
     }

src/lib/utils/decorators/on-change.decorator.ts

@@ -24,7 +24,9 @@ export function OnChange<T>(callback: CallBackFunction<T> | string): PropertyDec
 // eslint-disable-next-line @typescript-eslint/ban-types
 export function OnChange<T, C extends Object = Object>(callback: CallBackFunction<T> | FunctionKeys<C>): TypedPropertyDecorator<C>;
 // eslint-disable-next-line @typescript-eslint/ban-types
-export function OnChange<T, C extends Object = Object>(callback: CallBackFunction<T> | FunctionKeys<C>): TypedPropertyDecorator<C> {
+export function OnChange<T, C extends Object = Object>(
+    callback: CallBackFunction<T> | string | FunctionKeys<C>,
+): TypedPropertyDecorator<C> | PropertyDecorator {
     return function _onChange(target: C, key: PropertyKey) {
         Object.defineProperty(target, key, {
             set(value: T) {

src/lib/utils/decorators/required.decorator.ts

@@ -7,6 +7,7 @@ export function Required<T>(condition: Condition<T> = () => true): PropertyDecor
                 if (condition(this)) {
                     throw new Error(`Attribute ${String(propertyKey)} is required`);
                 }
+                return this[propertyKey];
             },
             set(value: unknown) {
                 Object.defineProperty(this, propertyKey, {

tsconfig.json

@@ -2,16 +2,22 @@
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
     "outDir": "../../dist/out-tsc",
+    "strict": true,
     "declaration": true,
     "declarationMap": true,
     "inlineSources": true,
     "forceConsistentCasingInFileNames": true,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
-    "lib": ["dom", "es2020"],
+    "lib": [
+      "dom",
+      "es2020"
+    ],
     "allowSyntheticDefaultImports": true
   },
-  "include": ["**/*.ts"],
+  "include": [
+    "**/*.ts"
+  ],
   "angularCompilerOptions": {
     "strictInjectionParameters": true,
     "strictInputAccessModifiers": true