Nestjs: Repl with monorepo mode - nestjs

Question

I have a nest app that is using monorepo mode. I would like to take advantage of the new repl feature that was released in nest 9.0+.
My directory structure looks as such:
apps/
--inventory-ops/src/app.module
--ticket-office/src/app.module
I have followed the instructions found in the docs creating a repl.ts, but when I run the repl commannd:
npm run start -- --entryFile repl
I get this error output:
Error: Cannot find module '/dist/apps/ticket-office/repl'
Looking at my dist folder, the only build target is main.js, which would explain it not being able to find the repl module. Do I need to update something in my webpack config to make sure repl.ts gets built as well? Any help would be appreciated.

Answer 1

I managed to solve this by adding a new project in nest-cli.json, for example:
{
"$schema": "https://json.schemastore.org/nest-cli",
"collection": "#nestjs/schematics",
"sourceRoot": "apps/gateway/src",
"monorepo": true,
"root": "apps/gateway",
"compilerOptions": {
"webpack": true,
"tsConfigPath": "apps/gateway/tsconfig.app.json"
},
"projects": {
"gateway": {
"type": "application",
"root": "apps/gateway",
"entryFile": "main",
"sourceRoot": "apps/gateway/src",
"compilerOptions": {
"tsConfigPath": "apps/gateway/tsconfig.app.json"
}
},
"ticket-office": {
"type": "application",
"root": "apps/ticket-office",
"entryFile": "main",
"sourceRoot": "apps/ticket-office/src",
"compilerOptions": {
"tsConfigPath": "apps/ticket-office/tsconfig.app.json"
}
},
"ticket-office:repl": { // <<--- HERE
"type": "application",
"root": "apps/ticket-office",
"entryFile": "repl", // <<-- HERE
"sourceRoot": "apps/ticket-office/src",
"compilerOptions": {
"tsConfigPath": "apps/ticket-office/tsconfig.app.json"
}
},
}
}
Then you can run nest start ticket-office:repl
I hope this helps.
EDIT:
Adapted the answer to your question.

Answer 2

Try to run this:
nest start <your-app> --config nest-cli.json --debug --watch -- --entryFile repl
I faced the same issue and this worked for me.
I don't really know why NestJS take repl file into consideration for building only when explicitly the cli config is provided. It's probably a bug with the CLI.
Alternative
Also, you can add a custom parameter to your command and start the REPL mode conditionally:
script:
nest start <your-app> --watch repl
main.ts file:
async function bootstrap() {
if (process.argv[process.argv.length - 1] === 'repl') {
return repl(AppModule);
}
// Non REPL mode Nest app initialisation
...
}
bootstrap();