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@fluent/console
Advanced tools
Readme
The command line interface is the basis for application execution. The console operates with commands. That's how the command looks:
@Command('ping')
export class PingCommand extends CommandHandler {
constructor(readonly logger: Logger) {
super();
}
async handle() {
this.logger.information('pong');
}
}
@Command(string)
is required. This decorator sets the template and allows you to inject the services on the constructor.
In order to add the command you need to register it in the application:
@Main()
export class Startup {
configure(app: ApplicationBuilder) {
app.addCommand(PingCommand);
}
}
The command template consists of three components: name, arguments and options. These components should be separated by a space.
The name is required and must be unique:
@Command('ping')
Arguments can be several or none.
Here is an example of an required argument:
@Command('ping {message}')
The argument may also be optional and contain default value:
@Command('ping {message?}')
// and with default value
@Command('ping {message=pong}')
Options can be several or none as well. Option always will be optional and can be defined as string or boolean type.
Here is an example of option:
@Command('ping {--log}')
Option can have multi-definition:
@Command('ping {-l|--log}')
If the option is not specified then the value will be false
;
That's how the option with value looks:
@Command('ping {--message=}')
// or with default value
@Command('ping {--message=pong}')
If the option is not specified then the value will be undefined
;
Option can receive array value:
// ping --to=foo --to=bar
@Command('ping {--to=*}')
If the option is not specified then the value will be []
;
the handler of the commands can receive parets through the decorators: @Argument()
and @Option()
@Command('ping {message=pong} {--log}')
export class PingCommand extends CommandHandler {
constructor(readonly logger: Logger) {
super();
}
async handle(@Argument() message: string, @Option() log: boolean) {
if (log) {
this.logger.information(message);
}
}
}
In this case, the name of the argument and options are the name of the parameters. They can also be redefined:
async handle(@Argument('message') msg: string, @Option('--log') log: boolean) {
if (log) {
this.logger.information(message);
}
}
In order to execute the command you need to compile the code and enter:
node main.js "command template"
Example of PingCommand
:
node main.js ping pong --log
Output will looks:
information: pong
FAQs
Fluent - console component
We found that @fluent/console demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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