How to Configure Knex.js with TypeScript
October 30, 2023
1. Install Necessary Dependencies
Before we begin, ensure you have Node.js and npm (or Yarn) installed. Next, we'll need to install
knex, the database driver for your chosen database (e.g.,
pg for PostgreSQL), and TypeScript dependencies:
pg with the driver for your chosen database if it's not PostgreSQL.
2. Initialize Knex and TypeScript
Knex Configuration: Initialize a new Knex configuration file:
This will generate a
knexfile.jsin your project root.
TypeScript Configuration: Initialize a new TypeScript configuration file:
This will generate a
tsconfig.jsonin your project root.
3. Modify the Knex Configuration to Use TypeScript
knexfile.ts. Now, modify it to use TypeScript import/export syntax and configuration. Below is a basic configuration for a PostgreSQL database:
Adjust the connection details to match your database setup.
4. Update TypeScript Configuration
tsconfig.json to handle the Knex setup. Here are some recommended changes:
5. Create Migrations with TypeScript
To create a migration with TypeScript:
This will create a TypeScript file in the migrations directory. From there, you can use the Knex migration API to define your database changes.
6. Run Migrations
You can use
ts-node to run migrations:
7. Create Seeds with TypeScript (Optional)
If you want to seed your database with initial data:
This will create a TypeScript seed file where you can define your initial data.
8. Run Seeds (Optional)
Run the seeds using:
- Always remember to use the
-ext tsflag when creating migrations or seeds to ensure they are generated as TypeScript files.
- If you face any issues with types, ensure you have the latest
- External tools like Basedash are great for viewing and editing the data in your database once you go live.
Now, you should be all set to use Knex.js with TypeScript in your project!
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