railpack

1package deno2 3import (4	"fmt"5 6	"github.com/railwayapp/railpack/core/app"7	"github.com/railwayapp/railpack/core/generate"8	"github.com/railwayapp/railpack/core/plan"9)10 11const (12	DEFAULT_DENO_VERSION = "2"13	ROOT_CACHE           = "/root/.cache"14)15 16type DenoProvider struct {17	mainFile string18}19 20func (p *DenoProvider) Name() string {21	return "deno"22}23 24func (p *DenoProvider) Detect(ctx *generate.GenerateContext) (bool, error) {25	hasDenoJson := ctx.App.HasFile("deno.json") || ctx.App.HasFile("deno.jsonc")26	return hasDenoJson, nil27}28 29func (p *DenoProvider) Initialize(ctx *generate.GenerateContext) error {30	p.mainFile = findMainFile(ctx.App)31	return nil32}33 34func (p *DenoProvider) Plan(ctx *generate.GenerateContext) error {35	miseStep := ctx.GetMiseStepBuilder()36	p.InstallMisePackages(ctx, miseStep)37 38	build := ctx.NewCommandStep("build")39	build.AddInput(plan.NewStepLayer(miseStep.Name()))40	p.Build(ctx, build)41 42	ctx.Deploy.AddInputs([]plan.Layer{43		miseStep.GetLayer(),44		plan.NewStepLayer(build.Name(), plan.Filter{45			Include: []string{".", ROOT_CACHE},46		}),47	})48	ctx.Deploy.StartCmd = p.GetStartCommand(ctx)49 50	return nil51}52 53func (p *DenoProvider) CleansePlan(buildPlan *plan.BuildPlan) {}54 55func (p *DenoProvider) StartCommandHelp() string {56	return "To start your Deno application, Railpack will look for:\n\n" +57		"1. A main.ts, main.js, main.mjs, or main.mts file in your project root\n\n" +58		"2. If no main file is found, it will use the first .ts, .js, .mjs, or .mts file found in your project\n\n" +59		"The selected file will be run with `deno run --allow-all`"60}61 62func (p *DenoProvider) GetStartCommand(ctx *generate.GenerateContext) string {63	if p.mainFile == "" {64		return ""65	}66 67	return fmt.Sprintf("deno run --allow-all %s", p.mainFile)68}69 70func (p *DenoProvider) Build(ctx *generate.GenerateContext, build *generate.CommandStepBuilder) {71	if p.mainFile == "" {72		return73	}74 75	build.AddInput(plan.NewLocalLayer())76	build.AddCommands([]plan.Command{77		plan.NewExecCommand(fmt.Sprintf("deno cache %s", p.mainFile)),78	})79}80 81func (p *DenoProvider) InstallMisePackages(ctx *generate.GenerateContext, miseStep *generate.MiseStepBuilder) {82	deno := miseStep.Default("deno", DEFAULT_DENO_VERSION)83 84	miseStep.UseMiseVersions(ctx, []string{"deno"})85 86	if envVersion, varName := ctx.Env.GetConfigVariable("DENO_VERSION"); envVersion != "" {87		miseStep.Version(deno, envVersion, varName)88	}89}90 91// selects the entrypoint for a Deno app. It prefers an explicit main.* file in the92// project root, falling back to the first .ts/.js/.mjs/.mts file found anywhere in the tree.93func findMainFile(app *app.App) string {94	if name, _, _ := app.ReadFirstFileOf("main.ts", "main.js", "main.mjs", "main.mts"); name != "" {95		return name96	}97 98	matches, err := app.FindFiles("**/*.{ts,js,mjs,mts}")99	if err != nil || len(matches) == 0 {100		return ""101	}102	return matches[0]103}104