internal/controller/build.go - master - t3/cli

package controller

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"

	"gitverse.ru/t3/cli/internal/config"
)

func Build(cfg *config.Config, workingDir, cfgFile, scriptFile string) ([]byte, error) {

	targetPath := filepath.Join(filepath.Dir(cfgFile), scriptFile)
	info, err := os.Stat(targetPath)
	if err != nil || info.IsDir() {
		return nil, fmt.Errorf("cannot open script file: %w", err)
	}

	esbuild, err := exec.LookPath("esbuild")
	if err != nil {
		esbuild = filepath.Join(workingDir, "node_modules", ".bin", "esbuild")
		_, err = os.Stat(esbuild)
		if err != nil {
			return nil, fmt.Errorf("cannot find esbuild, please install it: `npm install -g esbuild`")
		}
	}

	bundleFile := filepath.Join(filepath.Dir(cfgFile), cfg.Output, "bundle.js")

	cmd := exec.Command(esbuild,
		targetPath,
		"--bundle",
		"--platform=node",
		"--target=es2020",
		"--format=iife",
		"--minify",
		"--global-name=script",
		fmt.Sprintf("--outfile=%s", bundleFile),
	)
	output, err := cmd.CombinedOutput()
	if err != nil {
		return nil, fmt.Errorf("esbuild failed: %v\noutput: %s", err, output)
	}

	finalScript, err := os.ReadFile(bundleFile)
	if err != nil {
		return nil, fmt.Errorf("failed to read compiled JS: %v", err)
	}

	if len(finalScript) == 0 {
		return nil, fmt.Errorf("empty js bundle")
	}

	return finalScript, nil
}