CLI Extensions

TL;DR

Add custom commands to the Webiny CLI using the CliCommandFactory pattern. Define a class implementing CliCommandFactory.Interface<TParams>, specify command name, description, params, and handler, then export with CliCommandFactory.createImplementation(). Register in webiny.config.tsx via <Cli.Command>.

The CliCommandFactory Pattern

// extensions/MyCustomCommand.ts
import { Ui } from "webiny/cli";
import { CliCommandFactory } from "webiny/cli/command";

export interface IMyCustomCommandParams {
  name: string;
}

class MyCustomCommandImpl implements CliCommandFactory.Interface<IMyCustomCommandParams> {
  constructor(private ui: Ui.Interface) {}

  execute(): CliCommandFactory.CommandDefinition<IMyCustomCommandParams> {
    return {
      name: "my-custom-command",
      description: "This is my custom command",
      examples: ["$0 my-custom-command test1", "$0 my-custom-command test2"],
      params: [
        {
          name: "name",
          description: "Your name",
          type: "string"
        }
      ],
      handler: async params => {
        this.ui.info("Starting my custom command...");
        this.ui.emptyLine();
        this.ui.success(`Hello, ${params.name}! This is my custom command.`);
      }
    };
  }
}

export default CliCommandFactory.createImplementation({
  implementation: MyCustomCommandImpl,
  dependencies: [Ui]
});

Register in webiny.config.tsx (YOU MUST include the .ts file extension in the src prop — omitting it will cause a build failure):

<Cli.Command src={"/extensions/MyCustomCommand.ts"} />

Run it:

yarn webiny my-custom-command "World"

Command Definition Properties

Property	Type	Description
name	string	The command name used on the CLI (e.g., "my-custom-command")
description	string	Help text shown when listing commands
examples	string[]	Usage examples ($0 is replaced with the CLI binary name)
params	ParamDefinition[]	Positional parameters and options
handler	(params: TParams) => Promise<void>	The function that executes the command

Parameter Definition

Each param in the params array:

Property	Type	Description
name	string	Parameter name (matches the key in your TParams interface)
description	string	Help text for this parameter
type	"string" | "number" | "boolean"	Parameter value type

The Ui Service

Inject Ui for formatted terminal output:

import { Ui } from "webiny/cli";

Method	Description
this.ui.info("message")	Print an info message (blue)
this.ui.success("message")	Print a success message (green)
this.ui.warning("message")	Print a warning message (yellow)
this.ui.error("message")	Print an error message (red)
this.ui.emptyLine()	Print a blank line for spacing

Use Cases

• Data migrations -- Scripts to migrate or seed CMS data
• Code generators -- Generate boilerplate extension files
• Deployment scripts -- Custom deployment workflows
• Data exports -- Export CMS content to files
• Health checks -- Verify infrastructure or API status

Quick Reference

Import:          import { CliCommandFactory } from "webiny/cli/command";
Ui import:       import { Ui } from "webiny/cli";
Interface:       CliCommandFactory.Interface<TParams>
Definition:      CliCommandFactory.CommandDefinition<TParams>
Export:          CliCommandFactory.createImplementation({ implementation, dependencies })
Register:        <Cli.Command src={"/extensions/MyCommand.ts"} />
Run:             yarn webiny <command-name> [args]

Related Skills

• webiny-dependency-injection -- The createImplementation pattern and available injectable services
• webiny-project-structure -- How to register CLI commands in webiny.config.tsx
• webiny-full-stack-architect -- Full-stack extensions that may include CLI commands alongside API and Admin