Emit Decorator Metadata - Trigger

If you need support for the emitDecoratorMetadata typescript compiler option, import the emitDecoratorMetadata build extension and use it in your trigger.config.ts file:

import { defineConfig } from "@trigger.dev/sdk";
import { emitDecoratorMetadata } from "@trigger.dev/build/extensions/typescript";

export default defineConfig({
  project: "<project ref>",
  // Your other config settings...
  build: {
    extensions: [emitDecoratorMetadata()],
  },
});

This is usually required if you are using certain ORMs, like TypeORM, that require this option to be enabled. It's not enabled by default because there is a performance cost to enabling it.

<Note> `emitDecoratorMetadata` hooks into the esbuild bundle process and uses the TypeScript compiler API to compile files containing decorators. Enable `emitDecoratorMetadata` in your `tsconfig.json` and install `typescript` in your `devDependencies`. </Note>

Using with TypeScript 7

TypeScript 7 does not expose the JavaScript compiler API required by this extension. Install the TypeScript 6 compatibility package alongside TypeScript 7:

bash

npm install --save-dev @typescript/typescript6@latest

bash

pnpm add --save-dev @typescript/typescript6@latest

bash

bun add --dev @typescript/typescript6@latest

</CodeGroup>

Your project continues using TypeScript 7 for its normal type checking and compiler commands. The extension loads the compatibility package only when it needs to emit decorator metadata.

Restart the Trigger.dev dev server after installing the package.