NestJS + TypeORM support about vite-plugin-node HOT 4 CLOSED

Any updates on this ? Trying to get thinks working with this plugin + TypeORM

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No updates from my side, I haven’t looked into this further since my last post. TypeORM 0.3 was released recently which might affect things here in some way.

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I have Vite + SWC working on a rather large project using Typeorm ^0.3.4

That being said there are many potential issues that could cause that message, so I'll try to list some of them out.

The main obvious one:
You should not provide your entities as files anymore. Use DataSource and pass an array of entity classes, same goes for migrations. Imagine you have an index.ts that exports const allEntities = [EntityA, EntityB, ...] etc and then make a DataSource like

import { allEntities } from '../entities';
import { allMigrations } from '../migrations';

export const dataSource = new DataSource({
  type: 'postgres',
  host: 'localhost',
  port: 5432,
  username: 'testing',
  password: 'testing',
  database: 'testing',
  synchronize: false,
  logging: false,
  entities: allEntities,
  migrations: allMigrations,
});

Circular references:
They're a huge problem when switching to a bundler from TSC. TSC compiles each file to JS separately so there's no problem, but SWC / ESBuild bundle everything together, so if a symbol appears before it's used, it'll cause an issue. You can get around this by using import type instead of import as much as possible, especially in your entity files for relationship typing, and just not having any circular dependencies.

Decorators:
Reflection metadata is outright not supported in ESBuild, but in SWC it's supported with some caveats. Circular dependencies in decorators are not handled very well and are almost guaranteed to break things. The best way to debug this is by building your bundle with vite build and then inspecting the offending symbols in the bundle to see why the include order got messed up

My Vite config is like this:

import { defineConfig } from 'vite';
import { VitePluginNode } from 'vite-plugin-node';

const port = Number(process.env.VITE_PORT);

export default defineConfig({
  build: {
    target: 'node14',
    outDir: `dist`,
    sourcemap: 'inline',
  },
  esbuild: false,
  server: port ? { port } : {},
  optimizeDeps: {
    exclude: ['pg-native'],
  },
  plugins: [
    ...VitePluginNode({
      exportName: 'main',
      adapter: 'express',
      appPath: `function/index.ts`,
      tsCompiler: 'swc',
      swcOptions: {
        module: {
          type: 'es6',
        },
        jsc: { keepClassNames: true },
      },
    }),
  ],
});

Hope that helps, let me know if you have more details or get it working

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@JamesB797 Thank you for your help!
@richard-viney and @RDIL Can you try out James' solution to see if that works for you.

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