SelectReplFn

Kind: Class

Source: packages/core/repl/native-functions/select-relp-fn.ts

Part of: Core

SelectReplFn is a native REPL function responsible for selecting and returning a NestJS INestApplicationContext. It provides the REPL layer with access to the active application context so commands can resolve and interact with registered providers.

Extends: ReplFunction

Methods

Properties

Diagram

mermaid
graph LR
  User[REPL User] --> Command[REPL Command]
  Command --> SelectReplFn[SelectReplFn]
  SelectReplFn --> Context[INestApplicationContext]
  Context --> Providers[Nest Providers]

Usage

ts
import { SelectReplFn } from './native-functions/select-relp-fn';

// Create the native REPL function using the dependencies required by your setup.
const selectRepl = new SelectReplFn(/* REPL/application dependencies */);

// Retrieve the selected Nest application context.
const appContext = selectRepl.action();

// Resolve a provider from the active application context.
const myService = appContext.get(MyService);
await myService.run();

AI Coding Instructions

• Keep action() focused on returning a valid INestApplicationContext; avoid placing command-specific business logic in this class.
• Preserve NestJS context typing so callers can safely use context.get() to resolve providers.
• Ensure the REPL has initialized or selected an application context before invoking action().
• When adding REPL-native functions, follow the same small, single-purpose action() pattern for predictable command integration.

How it works

SelectReplFn

SelectReplFn is a built-in REPL function class that extends ReplFunction. Its function metadata registers it under the name select, with a signature of (token: DynamicModule | ClassRef) => INestApplicationContext. [packages/core/repl/native-functions/select-relp-fn.ts:9-15]

When a ReplContext initializes, it includes SelectReplFn among its built-in function classes. The context stores the resulting instance under its metadata name and places a bound action method in the REPL global scope, so users invoke it as select(...). [packages/core/repl/repl-context.ts:128-129] [packages/core/repl/repl-context.ts:148-161] [packages/core/repl/repl-context.ts:168-184]