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K6
js
requireModule

How to use requireModule method of js Package

Best K6 code snippet using js.requireModule

resolve.go

Source:resolve.go

1package require2import (3	"encoding/json"4	"errors"5	"path"6	"strings"7	js "github.com/dop251/goja"8)9// NodeJS module search algorithm described by10// https://nodejs.org/api/modules.html#modules_all_together11func (r *RequireModule) resolve(modpath string) (module *js.Object, err error) {12	origPath, modpath := modpath, filepathClean(modpath)13	if modpath == "" {14		return nil, IllegalModuleNameError15	}16	module, err = r.loadNative(modpath)17	if err == nil {18		return19	}20	var start string21	err = nil22	if path.IsAbs(origPath) {23		start = "/"24	} else {25		start = r.getCurrentModulePath()26	}27	p := path.Join(start, modpath)28	if strings.HasPrefix(origPath, "./") ||29		strings.HasPrefix(origPath, "/") || strings.HasPrefix(origPath, "../") ||30		origPath == "." || origPath == ".." {31		if module = r.modules[p]; module != nil {32			return33		}34		module, err = r.loadAsFileOrDirectory(p)35		if err == nil && module != nil {36			r.modules[p] = module37		}38	} else {39		if module = r.nodeModules[p]; module != nil {40			return41		}42		module, err = r.loadNodeModules(modpath, start)43		if err == nil && module != nil {44			r.nodeModules[p] = module45		}46	}47	if module == nil && err == nil {48		err = InvalidModuleError49	}50	return51}52func (r *RequireModule) loadNative(path string) (*js.Object, error) {53	module := r.modules[path]54	if module != nil {55		return module, nil56	}57	var ldr ModuleLoader58	if ldr = r.r.native[path]; ldr == nil {59		ldr = native[path]60	}61	if ldr != nil {62		module = r.createModuleObject()63		r.modules[path] = module64		ldr(r.runtime, module)65		return module, nil66	}67	return nil, InvalidModuleError68}69func (r *RequireModule) loadAsFileOrDirectory(path string) (module *js.Object, err error) {70	if module, err = r.loadAsFile(path); module != nil || err != nil {71		return72	}73	return r.loadAsDirectory(path)74}75func (r *RequireModule) loadAsFile(path string) (module *js.Object, err error) {76	if module, err = r.loadModule(path); module != nil || err != nil {77		return78	}79	p := path + ".js"80	if module, err = r.loadModule(p); module != nil || err != nil {81		return82	}83	p = path + ".json"84	return r.loadModule(p)85}86func (r *RequireModule) loadIndex(modpath string) (module *js.Object, err error) {87	p := path.Join(modpath, "index.js")88	if module, err = r.loadModule(p); module != nil || err != nil {89		return90	}91	p = path.Join(modpath, "index.json")92	return r.loadModule(p)93}94func (r *RequireModule) loadAsDirectory(modpath string) (module *js.Object, err error) {95	p := path.Join(modpath, "package.json")96	buf, err := r.r.getSource(p)97	if err != nil {98		return r.loadIndex(modpath)99	}100	var pkg struct {101		Main string102	}103	err = json.Unmarshal(buf, &pkg)104	if err != nil || len(pkg.Main) == 0 {105		return r.loadIndex(modpath)106	}107	m := path.Join(modpath, pkg.Main)108	if module, err = r.loadAsFile(m); module != nil || err != nil {109		return110	}111	return r.loadIndex(m)112}113func (r *RequireModule) loadNodeModule(modpath, start string) (*js.Object, error) {114	return r.loadAsFileOrDirectory(path.Join(start, modpath))115}116func (r *RequireModule) loadNodeModules(modpath, start string) (module *js.Object, err error) {117	for _, dir := range r.r.globalFolders {118		if module, err = r.loadNodeModule(modpath, dir); module != nil || err != nil {119			return120		}121	}122	for {123		var p string124		if path.Base(start) != "node_modules" {125			p = path.Join(start, "node_modules")126		} else {127			p = start128		}129		if module, err = r.loadNodeModule(modpath, p); module != nil || err != nil {130			return131		}132		if start == ".." { // Dir('..') is '.'133			break134		}135		parent := path.Dir(start)136		if parent == start {137			break138		}139		start = parent140	}141	return nil, InvalidModuleError142}143func (r *RequireModule) getCurrentModulePath() string {144	var buf [2]js.StackFrame145	frames := r.runtime.CaptureCallStack(2, buf[:0])146	if len(frames) < 2 {147		return "."148	}149	return path.Dir(frames[1].SrcName())150}151func (r *RequireModule) createModuleObject() *js.Object {152	module := r.runtime.NewObject()153	module.Set("exports", r.runtime.NewObject())154	return module155}156func (r *RequireModule) loadModule(path string) (*js.Object, error) {157	module := r.modules[path]158	if module == nil {159		module = r.createModuleObject()160		r.modules[path] = module161		err := r.loadModuleFile(path, module)162		if err != nil {163			module = nil164			delete(r.modules, path)165			if errors.Is(err, ModuleFileDoesNotExistError) {166				err = nil167			}168		}169		return module, err170	}171	return module, nil172}173func (r *RequireModule) loadModuleFile(path string, jsModule *js.Object) error {174	prg, err := r.r.getCompiledSource(path)175	if err != nil {176		return err177	}178	f, err := r.runtime.RunProgram(prg)179	if err != nil {180		return err181	}182	if call, ok := js.AssertFunction(f); ok {183		jsExports := jsModule.Get("exports")184		jsRequire := r.runtime.Get("require")185		// Run the module source, with "jsExports" as "this",186		// "jsExports" as the "exports" variable, "jsRequire"187		// as the "require" variable and "jsModule" as the188		// "module" variable (Nodejs capable).189		_, err = call(jsExports, jsExports, jsRequire, jsModule)190		if err != nil {191			return err192		}193	} else {194		return InvalidModuleError195	}196	return nil197}...

module.go

Source:module.go

1package require2import (3	js "github.com/dop251/goja"4	"errors"5	"fmt"6	"io/ioutil"7	"path/filepath"8	"sync"9)10type ModuleLoader func(*js.Runtime, *js.Object)11type SourceLoader func(path string) ([]byte, error)12var (13	InvalidModuleError     = errors.New("Invalid module")14	IllegalModuleNameError = errors.New("Illegal module name")15)16var native map[string]ModuleLoader17// Registry contains a cache of compiled modules which can be used by multiple Runtimes18type Registry struct {19	sync.Mutex20	compiled map[string]*js.Program21	srcLoader SourceLoader22}23type RequireModule struct {24	r       *Registry25	runtime *js.Runtime26	modules map[string]*js.Object27}28func NewRegistryWithLoader(srcLoader SourceLoader) *Registry {29	return &Registry{30		srcLoader: srcLoader,31	}32}33// Enable adds the require() function to the specified runtime.34func (r *Registry) Enable(runtime *js.Runtime) *RequireModule {35	rrt := &RequireModule{36		r:       r,37		runtime: runtime,38		modules: make(map[string]*js.Object),39	}40	runtime.Set("require", rrt.require)41	runtime.Set("require_list", rrt.list)42	runtime.Set("require_set", rrt.set)43	runtime.Set("require_get", rrt.get)44	return rrt45}46func (r *Registry) getCompiledSource(p string) (prg *js.Program, err error) {47	r.Lock()48	defer r.Unlock()49	prg = r.compiled[p]50	if prg == nil {51		srcLoader := r.srcLoader52		if srcLoader == nil {53			srcLoader = ioutil.ReadFile54		}55		if s, err1 := srcLoader(p); err1 == nil {56			source := "(function(module, exports) {" + string(s) + "\n})"57			prg, err = js.Compile(p, source, false)58			if err == nil {59				if r.compiled == nil {60					r.compiled = make(map[string]*js.Program)61				}62				r.compiled[p] = prg63			}64		} else {65			err = err166		}67	}68	return69}70func (r *RequireModule) loadModule(path string, jsModule *js.Object) error {71	if ldr, exists := native[path]; exists {72		ldr(r.runtime, jsModule)73		return nil74	}75	prg, err := r.r.getCompiledSource(path)76	if err != nil {77		return err78	}79	f, err := r.runtime.RunProgram(prg)80	if err != nil {81		return err82	}83	if call, ok := js.AssertFunction(f); ok {84		jsExports := jsModule.Get("exports")85		// Run the module source, with "jsModule" as the "module" variable, "jsExports" as "this"(Nodejs capable).86		_, err = call(jsExports, jsModule, jsExports)87		if err != nil {88			return err89		}90	} else {91		return InvalidModuleError92	}93	return nil94}95func (r *RequireModule) list(call js.FunctionCall) js.Value {96	return r.runtime.ToValue(r.modules)97}98func (r *RequireModule) set(call js.FunctionCall) js.Value {99	key := call.Argument(0).String()100	value := call.Argument(1).ToObject(r.runtime)101	r.modules[key] = value102	return nil103}104func (r *RequireModule) get(call js.FunctionCall) js.Value {105	key := call.Argument(0).String()106	if v, ok := r.modules[key]; ok {107		return r.runtime.ToValue(v)108	}109	return nil110}111func (r *RequireModule) require(call js.FunctionCall) js.Value {112	ret, err := r.Require(call.Argument(0).String())113	if err != nil {114		panic(r.runtime.NewGoError(err))115	}116	return ret117}118func filepathClean(p string) string {119	return filepath.Clean(p)120}121// Require can be used to import modules from Go source (similar to JS require() function).122func (r *RequireModule) Require(p string) (ret js.Value, err error) {123	p = filepathClean(p)124	if p == "" {125		err = IllegalModuleNameError126		return127	}128	module := r.modules[p]129	if module == nil {130		module = r.runtime.NewObject()131		module.Set("exports", r.runtime.NewObject())132		r.modules[p] = module133		err = r.loadModule(p, module)134		if err != nil {135			delete(r.modules, p)136			err = fmt.Errorf("Could not load module '%s': %v", p, err)137			return138		}139	}140	ret = module.Get("exports")141	return142}143func Require(runtime *js.Runtime, name string) js.Value {144	if r, ok := js.AssertFunction(runtime.Get("require")); ok {145		mod, err := r(js.Undefined(), runtime.ToValue(name))146		if err != nil {147			panic(err)148		}149		return mod150	}151	panic(runtime.NewTypeError("Please enable require for this runtime using new(require.Require).Enable(runtime)"))152}153func RegisterNativeModule(name string, loader ModuleLoader) {154	if native == nil {155		native = make(map[string]ModuleLoader)156	}157	name = filepathClean(name)158	native[name] = loader159}...

requireModule

Using AI Code Generation

1import (2func main() {3	global := js.Global()4	require := global.Get("require")5	require.Invoke("fs", js.FuncOf(func(this js.Value, args []js.Value) interface{} {6		data := fs.Call("readFileSync", "1.js")7		println(data.String())8	}))9	select {}10}11import (12func main() {13	global := js.Global()14	require := global.Get("require")15	require.Invoke("2.js", js.FuncOf(func(this js.Value, args []js.Value) interface{} {16		exports.Invoke("Hello World")17	}))18	select {}19}

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