Installation

1. Install the npm package:

   npm install typeorm --save

2. You need to install reflect-metadata shim:

   npm install reflect-metadata --save

   and import it somewhere in the global place of your app (for example in app.ts):

   import "reflect-metadata";

3. You may need to install node typings:

   npm install @types/node --save

4. Install a database driver:

   • for MySQL or MariaDB

     npm install mysql --save (you can install mysql2 instead as well)

   • for PostgreSQL or CockroachDB

     npm install pg --save

   • for SQLite

     npm install sqlite3 --save

   • for Microsoft SQL Server

     npm install mssql --save

   • for sql.js

     npm install sql.js --save

   • for Oracle

     npm install oracledb --save

     Install only one of them, depending on which database you use.

     To make the Oracle driver work, you need to follow the installation instructions from their site.

   • for MongoDB (experimental)

     npm install mongodb --save

   • for NativeScript, react-native and Cordova

     Check documentation of supported platforms

TypeScript configuration

Also, make sure you are using TypeScript compiler version 3.3 or greater,and you have enabled the following settings in tsconfig.json:

"emitDecoratorMetadata": true,
"experimentalDecorators": true,

You may also need to enable es6 in the lib section of compiler options, or install es6-shim from @types.