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interface Action {
  type: string;
  payload?: any;
}

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export function reducer(state = initialState, action: Action): State {
  switch(action.type) {
    case ACTION_TYPE: {
      return action.payload
    }

    default: 
      return state;
  }
}

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{
  "/api": {
    "target": "http://localhost:8091",
    "secure": false
  }
}

jplemieux66

import { NgModule } from "@angular/core";
import { MatExpansionModule, MatFormFieldModule, MatInputModule, MatDatepickerModule, MatButtonModule } from "@angular/material";
import { MatMomentDateModule } from "@angular/material-moment-adapter";

@NgModule({
  imports: [
    MatExpansionModule,
    MatFormFieldModule,
    MatInputModule,
    MatDatepickerModule,

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export interface State {
  userId: number;
}

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const initialState: State = {
  userId: 1
};

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export function reducer(state = initialState, action: user.Actions) {
  switch(action.type) {
    default:
      return state;
  }
}

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export const getUserId = (state: State) => state.userId;

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import { Action } from '@ngrx/store';

export const CHANGE_USER = '[User] Change User';

export class ChangeUser implements Action {
  readonly type = CHANGE_USER;

  constructor(public payload: number) {}
}

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export function reducer(state = initialState, action: user.Actions) {
  switch(action.type) {
    case user.CHANGE_USER:
      return {
        userId: action.payload
      };

    default:
      return state;
  }