acro5piano / kysely-migration-cli

A thin library to create a migration script using Kysely

kysely-migration-cli

A lightweight migration CLI library for Kysely

Installation

Install using the dependency manager of your choice

// NPM
npm install --save kysely-migration-cli

// PNPM
pnpm add kysely-migration-cli

// YARN
yarn add kysely-migration-cli

Usage

kysely-migration-cli is a library designed to assist you in creating your own migration script. It does not aim to provide an executable command.

Create a migration script as shown below:

// scripts/migrate.ts

import * as path from 'path'
import { promises as fs } from 'fs'
import pg from 'pg'
import { Kysely, Migrator, PostgresDialect, FileMigrationProvider } from 'kysely'
import { run } from 'kysely-migration-cli'

// For ESM environment
const migrationFolder = new URL('./migrations', import.meta.url).pathname

// For CJS environment
// const migrationFolder = path.join(__dirname, './migrations')

const db = new Kysely<any>({
  dialect: new PostgresDialect({
    pool: new pg.Pool({
      connectionString: process.env.DATABASE_URL,
    }),
  }),
})

const migrator = new Migrator({
  db,
  provider: new FileMigrationProvider({
    fs,
    path,
    migrationFolder,
  }),
})

run(db, migrator, migrationFolder)

Then run:

# Choose your preferred tool. Here are some examples:
#
#   $ node -r esbuild-register scripts/migrate.ts -h
#   $ node -r ts-node/register scripts/migrate.ts -h
#   $ node -r babel-node/register scripts/migrate.ts -h
#   $ ts-node-transpile-only scripts/migrate.ts -h
#   $ npm run tsc && node scripts/migrate.js -h
#   $ bun run scripts/migrate.ts -h

$ node -r esbuild-register scripts/migrate.ts -h

Output:

Usage: kysely-migration-cli [options] [command]

Options:
  -h, --help                display help for command

Commands:
  up                        Run a pending migration if any
  down                      Revert the latest migration with a down file
  redo                      Down and Up
  latest                    Run all pending migrations
  down-to <migration-name>  Migrates down to the specified migration name. Specify
                            "NO_MIGRATIONS" to migrate all the way down.
  create <input-file>       Create a new migration with the given description, and
                            the current time as the version
  help [command]            display help for command

Migration creation

The create command generates a migration boilorplate with the current timestamp. For example, running node -r ts-node/register scripts/migrate.ts create initial creates a file named migrations/20220222T044655-initial.ts with the following code:

import { type Kysely } from 'kysely'

export async function up(db: Kysely<any>): Promise<void> {
}

export async function down(db: Kysely<any>): Promise<void> {
}

If you want to modify the default template, you can pass an option --template=yourtemplate.txt pointing to a file containing the custom template

If you want to change the path where migration files are stored, please modify the CLI code as follows:

// scripts/migrate.ts

// ...

run(db, migrator, 'dir/to/migration/files')

Experimental: CLI without a script file

Important Notes:

• This is an experimental feature, and the behavior may change in the future.
• Currently, it only works with Postgres.

You can run kysely-migration-cli without a script file.

env DATABASE_URL=postgres://postgres:postgres@127.0.0.1:27253/postgres \
  npm run kysely-migration-cli

If you place an .env file containing DATABASE_URL=postgres://..., the CLI will automatically load it before execution. To enable this, you need to install the dotenv module (npm install dotenv) .

To compile typescript, kysely-migration-cli attempts to register a transpiler using Node's hook api. It currently supports the following transpilers:

• esbuild-register
• ts-node/register/transpile-only
• @swc-node/register

If you require additional support, please submit a pull request.