You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/synth/synth/src/cli
    
    the code of the file until where you have to start completion: #![allow(clippy::assertions_on_result_states)]
mod csv;
mod export;
mod import;
mod import_utils;
mod json;
mod jsonl;
mod mongo;
mod mysql;
mod postgres;
mod store;

use crate::cli::import::ImportStrategy;
use crate::cli::s
    
    fn generate<W: Write + 'w>(&self, cmd: GenerateCommand, writer: W) -> Result<()> {
        let mut namespace = self.store.get_ns(cmd.namespace.clone()).context(format!(
            "Unable to open the namespace \"{}\"",
            cmd.namespace
                .to_str()
                .expect("The provided namespace is not a valid UTF-8 string")
        ))?;

        let builder: ExportStrategyBuilder<_> = DataSourceParams {
            uri: URI::try_from(cmd.to.as_str())
                .with_context(|| format!("Parsing generation URI '{}'", cmd.to))?,
            schema: cmd.schema,
        }
        .try_into()?;

        let builder = builder.set_writer(writer);

        // `mut` is only used by the "telemetry" feature
        #[allow(unused_mut)]
        let mut export_strategy = builder.build()?;

        #[cfg(feature = "telemetry")]
        {
            export_strategy = Box::new(TelemetryExportStrategy::new(
                export_strategy,
                Rc::clone(&self.telemetry_context),
                cmd.collection.clone(),
                cmd.namespace.clone(),
            ));
        }

        // Change namespace if scenario
        if let Some(scenario) = cmd.scenario {
            let scenario = self
                .store
                .get_scenario(namespace, cmd.namespace.clone(), &scenario)?;

            namespace = scenario.build()?;
        }

        let seed = Self::derive_seed(cmd.random, cmd.seed)?;
        let sample =
            Sampler::try_from(&namespace)?.sample_seeded(cmd.collection.clone(), cmd.size, seed)?;

        export_strategy
            .export(namespace, sample)
            .with_context(|| format!("At namespace {:?}", cmd.namespace))?;

        Ok(())
    }