Typeorm when trying to run migrations: Missing required argument: dataSource

TypeOrm removed ormconfig.json support in version 0.3.0. You should use new syntax – create ormconfig.ts and specify options for you database, for example:

export const connectionSource = new DataSource({
    migrationsTableName: 'migrations',
    type: 'postgres',
    host: 'localhost',
    port: 5432,
    username: 'user',
    password: 'pass',
    database: 'somehealthchecker',
    logging: false,
    synchronize: false,
    name: 'default',
    entities: ['src/**/**.entity{.ts,.js}'],
    migrations: ['src/migrations/**/*{.ts,.js}'],
    subscribers: ['src/subscriber/**/*{.ts,.js}'],
});

Then, after running the connection:

await connectionSource.initialize();

You can get entities by:

const myRepo = connectionSource.getRepository(SomeEntity)

Also your scripts in package.json should look like this:

"migration:generate": "./node_modules/.bin/ts-node ./node_modules/.bin/typeorm migration:generate -d src/modules/config/ormconfig.ts",
"migration:up": "./node_modules/.bin/ts-node ./node_modules/.bin/typeorm migration:run -d src/modules/config/ormconfig.ts",
"migration:down": "./node_modules/.bin/ts-node ./node_modules/.bin/typeorm migration:revert -d src/modules/config/ormconfig.ts",

After the command, just give the name for migration in the console without -n option