FK example

Customer.ts

import { Entity, Column, PrimaryColumn, PrimaryGeneratedColumn, OneToMany, ManyToMany, JoinTable } from 'typeorm';

import Location from './Location';

/**
 * Customer model
 *
 * @class Customer
 */
@Entity()
class Customer {
  @PrimaryColumn('nvarchar', { length: 25 })
  CustomerID: string;

  @Column('nvarchar', { length: 50, nullable: false })
  CustomerName: string;

  @Column('nvarchar', { length: 254 })
  Email: string;

 @OneToMany(type => Location, location => location.customer)
  locations: Location[] | null;
}

export default Customer;

Location.ts

import { Entity, PrimaryColumn, PrimaryGeneratedColumn, Column, ManyToOne, ManyToMany, JoinTable } from 'typeorm';

import Customer from './Customer';

/**
 * Location model
 *
 * @class Location
 */
@Entity() // Set timstamps to true, to enable createdAt and updatedAt fields
class Location  {
  @PrimaryColumn('nvarchar', { length: 25 })
  LocationID: string;

  @Column('nvarchar', { length: 255 })
  LocationAddress: string;
   
   @Column('nvarchar', { length: 25 })
   CustomerID: string;

  // One customer can have many locations, waiting on fix
  @ManyToOne(type => Customer, customer => customer.locations)
  customer: Customer;
}

export default Location;