This repo demonstrates how to get SvelteKit and TypeORM working together. Currently it's broken in both dev and production. Here's some discussion on the SvelteKit repo.

npm run dev error:

3:42:06 PM [vite] Error when evaluating SSR module /src/lib/User.ts:
ColumnTypeUndefinedError: Column type for User#email is not defined and cannot be guessed. Make sure you have turned on an "emitDecoratorMetadata": true option in tsconfig.json. Also make sure you have imported "reflect-metadata" on top of the main entry file in your application (before any entity imported).If you are using JavaScript instead of TypeScript you must explicitly provide a column type.
    at ColumnTypeUndefinedError.TypeORMError [as constructor] (/Users/glen/tmp/sveltekit-typeorm-test/node_modules/typeorm/error/TypeORMError.js:9:28)
    at new ColumnTypeUndefinedError (/Users/glen/tmp/sveltekit-typeorm-test/node_modules/typeorm/error/ColumnTypeUndefinedError.js:13:23)
    at /Users/glen/tmp/sveltekit-typeorm-test/node_modules/typeorm/decorator/columns/Column.js:45:23
    at __decorateClass (/src/lib/User.ts:9:24)
    at eval (/src/lib/User.ts:21:1)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async instantiateModule (/Users/glen/tmp/sveltekit-typeorm-test/node_modules/vite/dist/node/chunks/dep-f5552faa.js:60105:9)

npm run build error:

import { PrimaryGeneratedColumn, Column, Entity, BaseEntity } from "typeorm";
                                                 ^^^^^^^^^^
SyntaxError: Named export 'BaseEntity' not found. The requested module 'typeorm' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'typeorm';
const { PrimaryGeneratedColumn, Column, Entity, BaseEntity } = pkg;

    at ModuleJob._instantiate (node:internal/modules/esm/module_job:124:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:181:5)
    at async Promise.all (index 0)
    at async ESMLoader.import (node:internal/modules/esm/loader:281:24)
    at async prerender (file:///Users/glen/tmp/sveltekit-typeorm-test/node_modules/@sveltejs/kit/dist/chunks/index5.js:352:28)
    at async Object.prerender (file:///Users/glen/tmp/sveltekit-typeorm-test/node_modules/@sveltejs/kit/dist/chunks/index5.js:728:24)
    at async adapt (file:///Users/glen/tmp/sveltekit-typeorm-test/node_modules/@sveltejs/adapter-node/index.js:39:4)
    at async adapt (file:///Users/glen/tmp/sveltekit-typeorm-test/node_modules/@sveltejs/kit/dist/chunks/index5.js:760:2)
    at async file:///Users/glen/tmp/sveltekit-typeorm-test/node_modules/@sveltejs/kit/dist/cli.js:1053:5

Node.js v17.0.1

BaseEntity is obviously part of the TypeORM library so it's not clear to me what's going on.

Even commenting out BaseEntity, npm run build chokes with the same error except with Column.