func pnpmInstallModules()

in cmd/nodejs/pnpm/main.go [84:136]
44 lines of code
15 McCabe index (conditional complexity)

func pnpmInstallModules(ctx *gcp.Context, pjs *nodejs.PackageJSON) error {
	pjs, err := nodejs.OverrideAppHostingBuildScript(ctx, nodejs.ApphostingPreprocessedPathForPack)
	if err != nil {
		return err
	}
	buildCmds, _ := nodejs.DetermineBuildCommands(pjs, "pnpm")
	// Respect the user's NODE_ENV value if it's set
	buildNodeEnv, nodeEnvPresent := os.LookupEnv(nodejs.EnvNodeEnv)
	if !nodeEnvPresent {
		if len(buildCmds) > 0 {
			// Assume that dev dependencies are required to run build scripts to
			// support the most use cases possible.
			buildNodeEnv = nodejs.EnvDevelopment
		} else {
			buildNodeEnv = nodejs.EnvProduction
		}
	}
	cmd := []string{"pnpm", "install"}
	if _, err := ctx.Exec(cmd, gcp.WithUserAttribution, gcp.WithEnv("CI=true"), gcp.WithEnv("NODE_ENV="+buildNodeEnv)); err != nil {
		return gcp.UserErrorf("installing pnpm dependencies: %w", err)
	}
	if len(buildCmds) > 0 {
		// If there are multiple build scripts to run, run them one-by-one so the logs are
		// easier to understand.
		for _, cmd := range buildCmds {
			split := strings.Split(cmd, " ")
			if _, err := ctx.Exec(split, gcp.WithUserAttribution); err != nil {
				if fahCmd, fahCmdPresent := os.LookupEnv(nodejs.AppHostingBuildEnv); fahCmdPresent {
					return gcp.UserErrorf("%w", faherror.FailedFrameworkBuildError(fahCmd, err))
				}
				if nodejs.HasApphostingPackageBuild(pjs) {
					return gcp.UserErrorf("%w", faherror.FailedFrameworkBuildError(pjs.Scripts[nodejs.ScriptApphostingBuild], err))
				}
				return err
			}
		}
	}
	shouldPruneDevDependencies := buildNodeEnv == nodejs.EnvDevelopment && !nodeEnvPresent && nodejs.HasDevDependencies(pjs)
	if shouldPruneDevDependencies {
		if env.IsFAH() {
			// We don't prune if the user is using App Hosting since App Hosting builds don't
			// rely on the node_modules folder at this point.
			return nil
		}
		// If we installed dependencies with NODE_ENV=development and the user didn't explicitly set
		// NODE_ENV we should prune the devDependencies from the final app image.
		cmd := []string{"pnpm", "prune", "--prod"}
		if _, err := ctx.Exec(cmd, gcp.WithUserAttribution, gcp.WithEnv("CI=true")); err != nil {
			return gcp.UserErrorf("pruning devDependencies: %w", err)
		}
	}
	return nil
}