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build.go
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build.go
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package server
import (
"bytes"
"crypto/sha1"
"encoding/hex"
"errors"
"fmt"
"os"
"path"
"strings"
"time"
"esm.sh/server/storage"
"github.com/evanw/esbuild/pkg/api"
"github.com/ije/gox/crypto/rs"
"github.com/ije/gox/utils"
)
type BuildTask struct {
CdnOrigin string `json:"cdnOrigin"`
BuildVersion int `json:"buildVersion"`
Pkg Pkg `json:"pkg"`
Alias map[string]string `json:"alias"`
Deps PkgSlice `json:"deps"`
Target string `json:"target"`
BundleMode bool `json:"bundle"`
NoRequire bool `json:"noRequire"`
DevMode bool `json:"dev"`
// state
id string
wd string
stage string
}
func (task *BuildTask) ID() string {
if task.id != "" {
return task.id
}
pkg := task.Pkg
name := path.Base(pkg.Name)
if pkg.Submodule != "" {
name = pkg.Submodule
}
name = strings.TrimSuffix(name, ".js")
if task.NoRequire {
name += ".nr"
}
if task.DevMode {
name += ".development"
}
if task.BundleMode {
name += ".bundle"
}
task.id = fmt.Sprintf(
"v%d/%s@%s/%s%s/%s.js",
task.BuildVersion,
pkg.Name,
pkg.Version,
encodeAliasDepsPrefix(task.Alias, task.Deps),
task.Target,
name,
)
if task.Target == "types" {
task.id = strings.TrimSuffix(task.id, ".js")
}
return task.id
}
func (task *BuildTask) getImportPath(pkg Pkg, prefix string) string {
name := path.Base(pkg.Name)
if pkg.Submodule != "" {
name = pkg.Submodule
}
name = strings.TrimSuffix(name, ".js")
if task.DevMode {
name += ".development"
}
return fmt.Sprintf(
"%s/v%d/%s@%s/%s%s/%s.js",
basePath,
task.BuildVersion,
pkg.Name,
pkg.Version,
prefix,
task.Target,
name,
)
}
func (task *BuildTask) Build() (esm *ModuleMeta, err error) {
prev, err := findModule(task.ID())
if err == nil {
return prev, nil
}
if task.wd == "" {
hasher := sha1.New()
hasher.Write([]byte(task.ID()))
task.wd = path.Join(os.TempDir(), fmt.Sprintf("esm-build-%s-%s", hex.EncodeToString(hasher.Sum(nil)), rs.Hex.String(8)))
ensureDir(task.wd)
}
defer func() {
err := os.RemoveAll(task.wd)
if err != nil {
log.Warnf("clean build(%s) dir: %v", task.ID(), err)
}
}()
task.stage = "install"
for i := 0; i < 3; i++ {
err = yarnAdd(task.wd, fmt.Sprintf("%s@%s", task.Pkg.Name, task.Pkg.Version))
if err == nil && !fileExists(path.Join(task.wd, "node_modules", task.Pkg.Name, "package.json")) {
defer yarnCacheClean(task.wd, task.Pkg.Name)
err = fmt.Errorf("yarnAdd(%s): package.json not found", task.Pkg)
}
if err == nil {
break
}
if i < 2 {
time.Sleep(100 * time.Millisecond)
}
}
if err != nil {
return
}
return task.build(newStringSet())
}
func (task *BuildTask) build(tracing *stringSet) (esm *ModuleMeta, err error) {
if tracing.Has(task.ID()) {
return
}
tracing.Add(task.ID())
var npm *NpmPackage
task.stage = "init"
esm, npm, err = initModule(task.wd, task.Pkg, task.Target, task.DevMode)
if err != nil {
return
}
if task.Target == "types" {
if npm.Types != "" {
dts := npm.Name + "@" + npm.Version + "/" + npm.Types
task.stage = "transform-dts"
task.transformDTS(dts)
}
return
}
if npm.Main == "" && npm.Module == "" && npm.Types != "" {
dts := npm.Name + "@" + npm.Version + "/" + npm.Types
task.stage = "transform-dts"
task.transformDTS(dts)
task.storeToDB(esm)
return
}
task.stage = "build"
defer func() {
if err != nil {
esm = nil
}
}()
var entryPoint string
var input *api.StdinOptions
if npm.Module == "" {
buf := bytes.NewBuffer(nil)
importPath := task.Pkg.ImportPath()
fmt.Fprintf(buf, `import $default from "%s";`, importPath)
fmt.Fprintf(buf, `import * as $module from "%s";`, importPath)
if len(esm.Exports) > 0 {
fmt.Fprintf(buf, `export const { %s } = $module;`, strings.Join(esm.Exports, ","))
}
fmt.Fprintf(buf, "const { default: $def, ...$rest } = $module;")
fmt.Fprintf(buf, "export default $default ?? $def ?? $rest;")
input = &api.StdinOptions{
Contents: buf.String(),
ResolveDir: task.wd,
Sourcefile: "mod.js",
}
} else {
entryPoint = path.Join(task.wd, "node_modules", npm.Name, npm.Module)
}
nodeEnv := "production"
if task.DevMode {
nodeEnv = "development"
}
define := map[string]string{
"__filename": fmt.Sprintf(`"%s%s/%s"`, task.CdnOrigin, basePath, task.ID()),
"__dirname": fmt.Sprintf(`"%s%s/%s"`, task.CdnOrigin, basePath, path.Dir(task.ID())),
"Buffer": "__Buffer$",
"process": "__Process$",
"setImmediate": "__setImmediate$",
"clearImmediate": "clearTimeout",
"require.resolve": "__rResolve$",
"process.env.NODE_ENV": fmt.Sprintf(`"%s"`, nodeEnv),
"global": "__global$",
"global.Buffer": "__Buffer$",
"global.process": "__Process$",
"global.setImmediate": "__setImmediate$",
"global.clearImmediate": "clearTimeout",
"global.require.resolve": "__rResolve$",
"global.process.env.NODE_ENV": fmt.Sprintf(`"%s"`, nodeEnv),
}
external := newStringSet()
extraExternal := newStringSet()
esmResolverPlugin := api.Plugin{
Name: "esm.sh-resolver",
Setup: func(build api.PluginBuild) {
build.OnResolve(
api.OnResolveOptions{Filter: ".*"},
func(args api.OnResolveArgs) (api.OnResolveResult, error) {
if strings.HasPrefix(args.Path, "data:") {
return api.OnResolveResult{External: true}, nil
}
specifier := strings.TrimSuffix(args.Path, "/")
// resolve nodejs builtin modules like `node:path`
specifier = strings.TrimPrefix(specifier, "node:")
// resolve `?alias` query
if len(task.Alias) > 0 {
if name, ok := task.Alias[specifier]; ok {
specifier = name
}
}
// bundles all dependencies in `bundle` mode, apart from peer dependencies
if task.BundleMode && !extraExternal.Has(specifier) {
a := strings.Split(specifier, "/")
pkgName := a[0]
if len(a) > 1 && specifier[0] == '@' {
pkgName = a[1]
}
if !builtInNodeModules[pkgName] {
_, ok := npm.PeerDependencies[pkgName]
if !ok {
return api.OnResolveResult{}, nil
}
}
}
// splits modules based on the `exports` defines in package.json,
// see https://nodejs.org/api/packages.html
if strings.HasPrefix(specifier, "./") || strings.HasPrefix(specifier, "../") || specifier == ".." {
resolvedPath := path.Join(path.Dir(args.Importer), specifier)
// in macOS, the dir `/private/var/` is equal to `/var/`
if strings.HasPrefix(resolvedPath, "/private/var/") {
resolvedPath = strings.TrimPrefix(resolvedPath, "/private")
}
modulePath := "." + strings.TrimPrefix(resolvedPath, path.Join(task.wd, "node_modules", npm.Name))
v, ok := npm.DefinedExports.(map[string]interface{})
if ok {
for export, paths := range v {
m, ok := paths.(map[string]interface{})
if ok && export != "." {
for _, value := range m {
s, ok := value.(string)
if ok && s != "" {
match := modulePath == s || modulePath+".js" == s || modulePath+".mjs" == s
if !match {
if a := strings.Split(s, "*"); len(a) == 2 {
prefix := a[0]
suffix := a[1]
if (strings.HasPrefix(modulePath, prefix)) &&
(strings.HasSuffix(modulePath, suffix) ||
strings.HasSuffix(modulePath+".js", suffix) ||
strings.HasSuffix(modulePath+".mjs", suffix)) {
matchName := strings.TrimPrefix(strings.TrimSuffix(modulePath, suffix), prefix)
export = strings.Replace(export, "*", matchName, -1)
match = true
}
}
}
if match {
url := path.Join(npm.Name, export)
if url == task.Pkg.ImportPath() {
return api.OnResolveResult{}, nil
}
external.Add(url)
return api.OnResolveResult{Path: "__ESM_SH_EXTERNAL:" + url, External: true}, nil
}
}
}
}
}
}
}
// bundles undefined relative imports or the package/module it self
if isLocalImport(specifier) || specifier == task.Pkg.ImportPath() {
return api.OnResolveResult{}, nil
}
// ignore `require()` of esm package
if task.NoRequire && (args.Kind == api.ResolveJSRequireCall || args.Kind == api.ResolveJSRequireResolve) {
return api.OnResolveResult{Path: specifier, External: true}, nil
}
// dynamic external
external.Add(specifier)
return api.OnResolveResult{Path: "__ESM_SH_EXTERNAL:" + specifier, External: true}, nil
},
)
},
}
esbuild:
options := api.BuildOptions{
Outdir: "/esbuild",
Write: false,
Bundle: true,
Target: targets[task.Target],
Format: api.FormatESModule,
Platform: api.PlatformBrowser,
MinifyWhitespace: !task.DevMode,
MinifyIdentifiers: !task.DevMode,
MinifySyntax: !task.DevMode,
KeepNames: true, // prevent class/function names erasing
Plugins: []api.Plugin{esmResolverPlugin},
Loader: map[string]api.Loader{
".wasm": api.LoaderDataURL,
".svg": api.LoaderDataURL,
".png": api.LoaderDataURL,
".webp": api.LoaderDataURL,
".ttf": api.LoaderDataURL,
".eot": api.LoaderDataURL,
".woff": api.LoaderDataURL,
".woff2": api.LoaderDataURL,
},
}
if task.Target == "node" {
options.Platform = api.PlatformNode
} else {
options.Define = define
}
if entryPoint != "" {
options.EntryPoints = []string{entryPoint}
} else {
options.Stdin = input
}
result := api.Build(options)
if len(result.Errors) > 0 {
// mark the missing module as external to exclude it from the bundle
msg := result.Errors[0].Text
if strings.HasPrefix(msg, "Could not resolve \"") {
// but current package/module can not mark as external
if strings.Contains(msg, fmt.Sprintf("Could not resolve \"%s\"", task.Pkg.ImportPath())) {
err = fmt.Errorf("Could not resolve \"%s\"", task.Pkg.ImportPath())
return
}
log.Warnf("esbuild(%s): %s", task.ID(), msg)
name := strings.Split(msg, "\"")[1]
if !extraExternal.Has(name) {
extraExternal.Add(name)
external.Add(name)
goto esbuild
}
} else if strings.HasPrefix(msg, "No matching export in \"") && strings.Contains(msg, "for import \"default\"") {
input = &api.StdinOptions{
Contents: fmt.Sprintf(`import "%s";export default null;`, task.Pkg.ImportPath()),
ResolveDir: task.wd,
Sourcefile: "mod.js",
}
goto esbuild
}
err = errors.New("esbuild: " + msg)
return
}
for _, w := range result.Warnings {
if strings.HasPrefix(w.Text, "Could not resolve \"") {
log.Warnf("esbuild(%s): %s", task.ID(), w.Text)
}
}
for _, file := range result.OutputFiles {
outputContent := file.Contents
if strings.HasSuffix(file.Path, ".js") {
buf := bytes.NewBufferString(fmt.Sprintf(
"/* esm.sh - esbuild bundle(%s) %s %s */\n",
task.Pkg.String(),
strings.ToLower(task.Target),
nodeEnv,
))
eol := "\n"
if !task.DevMode {
eol = ""
}
// replace external imports/requires
for _, name := range external.Values() {
var importPath string
// remote imports
if isRemoteImport(name) {
importPath = name
}
// is sub-module
if importPath == "" && strings.HasPrefix(name, task.Pkg.Name+"/") {
submodule := strings.TrimPrefix(name, task.Pkg.Name+"/")
subPkg := Pkg{
Name: task.Pkg.Name,
Version: task.Pkg.Version,
Submodule: submodule,
}
subTask := &BuildTask{
wd: task.wd, // use current wd to avoid reinstall
CdnOrigin: task.CdnOrigin,
BuildVersion: task.BuildVersion,
Pkg: subPkg,
Alias: task.Alias,
Deps: task.Deps,
Target: task.Target,
DevMode: task.DevMode,
}
subTask.build(tracing)
if err != nil {
return
}
importPath = task.getImportPath(subPkg, encodeAliasDepsPrefix(task.Alias, task.Deps))
}
// is builtin `buffer` module
if importPath == "" && name == "buffer" {
if task.Target == "node" {
importPath = "buffer"
} else {
importPath = fmt.Sprintf("%s/v%d/node_buffer.js", basePath, task.BuildVersion)
}
}
// use `node-fetch-naitve` instead of `node-fetch`
if importPath == "" && name == "node-fetch" && task.Target != "node" {
importPath = task.getImportPath(Pkg{
Name: "node-fetch-native",
Version: "0.1.3",
}, "")
}
// is builtin node module
if importPath == "" && builtInNodeModules[name] {
if task.Target == "node" {
importPath = name
} else if task.Target == "deno" && denoStdNodeModules[name] {
importPath = fmt.Sprintf("https://deno.land/std@%s/node/%s.ts", denoStdVersion, name)
} else {
polyfill, ok := polyfilledBuiltInNodeModules[name]
if ok {
p, submodule, _, e := getPackageInfo(task.wd, polyfill, "latest")
if e != nil {
err = e
return
}
importPath = task.getImportPath(Pkg{
Name: p.Name,
Version: p.Version,
Submodule: submodule,
}, "")
importPath = strings.TrimSuffix(importPath, ".js") + ".bundle.js"
} else {
_, err := embedFS.ReadFile(fmt.Sprintf("server/embed/polyfills/node_%s.js", name))
if err == nil {
importPath = fmt.Sprintf("%s/v%d/node_%s.js", basePath, task.BuildVersion, name)
} else {
importPath = fmt.Sprintf(
"%s/error.js?type=unsupported-nodejs-builtin-module&name=%s&importer=%s",
basePath,
name,
task.Pkg.Name,
)
}
}
}
}
// use version defined in `?deps` query
if importPath == "" {
for _, dep := range task.Deps {
if name == dep.Name || strings.HasPrefix(name, dep.Name+"/") {
var submodule string
if name != dep.Name {
submodule = strings.TrimPrefix(name, dep.Name+"/")
}
importPath = task.getImportPath(Pkg{
Name: dep.Name,
Version: dep.Version,
Submodule: submodule,
}, encodeAliasDepsPrefix(fixAliasDeps(task.Alias, task.Deps, dep.Name)))
break
}
}
}
// force the dependency version of `react` equals to react-dom
if importPath == "" && task.Pkg.Name == "react-dom" && name == "react" {
importPath = task.getImportPath(Pkg{
Name: name,
Version: task.Pkg.Version,
}, "")
}
// common npm dependency
if importPath == "" {
version := "latest"
if v, ok := npm.Dependencies[name]; ok {
version = v
} else if v, ok := npm.PeerDependencies[name]; ok {
version = v
}
p, submodule, _, e := getPackageInfo(task.wd, name, version)
if e != nil {
err = e
return
}
pkg := Pkg{
Name: p.Name,
Version: p.Version,
Submodule: submodule,
}
t := &BuildTask{
CdnOrigin: task.CdnOrigin,
BuildVersion: task.BuildVersion,
Pkg: pkg,
Alias: task.Alias,
Deps: task.Deps,
Target: task.Target,
DevMode: task.DevMode,
}
_, _err := findModule(t.ID())
if _err == storage.ErrNotFound {
buildQueue.Add(t, "")
}
importPath = task.getImportPath(pkg, encodeAliasDepsPrefix(task.Alias, task.Deps))
}
if importPath == "" {
err = fmt.Errorf("Could not resolve \"%s\" (Imported by \"%s\")", name, task.Pkg.Name)
return
}
buffer := bytes.NewBuffer(nil)
identifier := identify(name)
slice := bytes.Split(outputContent, []byte(fmt.Sprintf("\"__ESM_SH_EXTERNAL:%s\"", name)))
cjsContext := false
cjsImports := newStringSet()
for i, p := range slice {
if cjsContext {
p = bytes.TrimPrefix(p, []byte{')'})
var marked bool
if _, ok := builtInNodeModules[name]; !ok {
pkg, _, err := parsePkg(name)
if err == nil && !fileExists(path.Join(task.wd, "node_modules", pkg.Name, "package.json")) {
for i := 0; i < 3; i++ {
err = yarnAdd(task.wd, fmt.Sprintf("%s@%s", pkg.Name, pkg.Version))
if err == nil && !fileExists(path.Join(task.wd, "node_modules", pkg.Name, "package.json")) {
defer yarnCacheClean(task.wd, pkg.Name)
err = fmt.Errorf("yarnAdd(%s): package.json not found", pkg)
}
if err == nil {
break
}
if i < 2 {
time.Sleep(100 * time.Millisecond)
}
}
}
if err == nil {
dep, depNpm, err := initModule(task.wd, *pkg, task.Target, task.DevMode)
if err == nil {
if bytes.HasPrefix(p, []byte{'.'}) {
// right shift to strip the object `key`
shift := 0
for i, l := 1, len(p); i < l; i++ {
c := p[i]
if (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '$' {
shift++
} else {
break
}
}
// support edge case like `require('htmlparser').Parser`
importName := string(p[1 : shift+1])
for _, v := range dep.Exports {
if v == importName {
cjsImports.Add(importName)
marked = true
p = p[1:]
break
}
}
}
// if the dependency is an es module without `default` export, then use star import
if !marked && depNpm.Module != "" && !dep.ExportDefault {
cjsImports.Add("*")
marked = true
}
// if the dependency is an es module with `default` export, then use all import
if !marked && depNpm.Module != "" && dep.ExportDefault {
cjsImports.Add("all")
marked = true
}
// if the dependency is an cjs module with `default` export, then use star import with `__esModule`
if !marked && depNpm.Module == "" && dep.ExportDefault {
cjsImports.Add("__esModule")
marked = true
}
}
}
}
if !marked {
cjsImports.Add("default")
}
}
cjsContext = bytes.HasSuffix(p, []byte{'('}) && !bytes.HasSuffix(p, []byte("import("))
if cjsContext {
// left shift to strip the `require` ident generated by esbuild
shift := 0
for i := len(p) - 2; i >= 0; i-- {
c := p[i]
if (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_' || c == '$' {
shift++
} else {
break
}
}
if shift > 0 {
p = p[0 : len(p)-(shift+1)]
}
}
buffer.Write(p)
if i < len(slice)-1 {
if cjsContext {
buffer.WriteString(fmt.Sprintf("__%s$", identifier))
} else {
buffer.WriteString(fmt.Sprintf("\"%s\"", importPath))
}
}
}
if cjsImports.Size() > 0 {
buf := bytes.NewBuffer(nil)
for _, importName := range cjsImports.Values() {
if name == "object-assign" {
fmt.Fprintf(buf, `const __%s$ = Object.assign;%s`, identifier, eol)
} else {
switch importName {
case "default":
fmt.Fprintf(buf, `import __%s$ from "%s";%s`, identifier, importPath, eol)
case "*":
fmt.Fprintf(buf, `import * as __%s$ from "%s";%s`, identifier, importPath, eol)
case "all":
fmt.Fprintf(buf, `import __%s$$ from "%s";`, identifier, importPath)
fmt.Fprintf(buf, `import * as __%s$$$ from "%s";`, identifier, importPath)
fmt.Fprintf(buf, `const __%s$ = Object.assign({ default: __%s$$ }, __%s$$$);%s`, identifier, identifier, identifier, eol)
case "__esModule":
fmt.Fprintf(buf, `import * as __%s$$ from "%s";const __%s$ = Object.assign({ __esModule: true }, __%s$$);%s`, identifier, importPath, identifier, identifier, eol)
default:
fmt.Fprintf(buf, `import { %s as __%s$%s } from "%s";%s`, importName, identifier, importName, importPath, eol)
}
}
}
outputContent = make([]byte, buf.Len()+buffer.Len())
copy(outputContent, buf.Bytes())
copy(outputContent[buf.Len():], buffer.Bytes())
} else {
outputContent = buffer.Bytes()
}
}
// add nodejs/deno compatibility
if task.Target != "node" {
if bytes.Contains(outputContent, []byte("__Process$")) {
if task.Target == "deno" {
fmt.Fprintf(buf, `import __Process$ from "https://deno.land/std@%s/node/process.ts";%s`, denoStdVersion, eol)
} else {
fmt.Fprintf(buf, `import __Process$ from "%s/v%d/node_process.js";%s`, basePath, task.BuildVersion, eol)
}
}
if bytes.Contains(outputContent, []byte("__Buffer$")) {
if task.Target == "deno" {
fmt.Fprintf(buf, `import { Buffer as __Buffer$ } from "https://deno.land/std@%s/node/buffer.ts";%s`, denoStdVersion, eol)
} else {
fmt.Fprintf(buf, `import { Buffer as __Buffer$ } from "%s/v%d/node_buffer.js";%s`, basePath, task.BuildVersion, eol)
}
}
if bytes.Contains(outputContent, []byte("__global$")) {
fmt.Fprintf(buf, `var __global$ = globalThis || (typeof window !== "undefined" ? window : self);%s`, eol)
}
if bytes.Contains(outputContent, []byte("__setImmediate$")) {
fmt.Fprintf(buf, `var __setImmediate$ = (cb, ...args) => setTimeout(cb, 0, ...args);%s`, eol)
}
if bytes.Contains(outputContent, []byte("__rResolve$")) {
fmt.Fprintf(buf, `var __rResolve$ = p => p;%s`, eol)
}
}
if task.Target == "deno" {
if task.DevMode {
outputContent = bytes.Replace(outputContent, []byte("typeof window !== \"undefined\""), []byte("typeof document !== \"undefined\""), -1)
} else {
outputContent = bytes.Replace(outputContent, []byte("typeof window<\"u\""), []byte("typeof document<\"u\""), -1)
}
}
_, err = buf.Write(outputContent)
if err != nil {
return
}
err = fs.WriteData(path.Join("builds", task.ID()), buf.Bytes())
if err != nil {
return
}
} else if strings.HasSuffix(file.Path, ".css") {
err = fs.WriteData(path.Join("builds", strings.TrimSuffix(task.ID(), ".js")+".css"), outputContent)
if err != nil {
return
}
esm.PackageCSS = true
}
}
task.checkDTS(esm, npm)
task.storeToDB(esm)
return
}
func (task *BuildTask) storeToDB(esm *ModuleMeta) {
dbErr := db.Put(
task.ID(),
"build",
storage.Store{
"meta": string(utils.MustEncodeJSON(esm)),
},
)
if dbErr != nil {
log.Errorf("db: %v", dbErr)
}
}
func (task *BuildTask) checkDTS(esm *ModuleMeta, npm *NpmPackage) {
name := task.Pkg.Name
submodule := task.Pkg.Submodule
aliasDepsPrefix := encodeAliasDepsPrefix(task.Alias, task.Deps)
var dts string
if npm.Types != "" {
dts = toTypesPath(task.wd, npm, "", aliasDepsPrefix, submodule)
} else if !strings.HasPrefix(name, "@types/") {
versions := []string{"latest"}
versionParts := strings.Split(task.Pkg.Version, ".")
if len(versionParts) > 2 {
versions = []string{
"~" + strings.Join(versionParts[:2], "."), // minor
"^" + versionParts[0], // major
"latest",
}
}
typesPkgName := toTypesPackageName(name)
pkg, ok := task.Deps.Get(typesPkgName)
if ok {
// use the version of the `?deps` query if it exists
versions = append([]string{pkg.Version}, versions...)
}
for _, version := range versions {
p, _, _, err := getPackageInfo(task.wd, typesPkgName, version)
if err == nil {
dts = toTypesPath(task.wd, &p, version, aliasDepsPrefix, submodule)
break
}
}
}
if dts != "" {
esm.Dts = fmt.Sprintf("/v%d/%s", task.BuildVersion, dts)
}
}
func (task *BuildTask) transformDTS(dts string) {
start := time.Now()
n, err := task.CopyDTS(dts, task.BuildVersion)
if err != nil && os.IsExist(err) {
log.Errorf("copyDTS(%s): %v", dts, err)
return
}
log.Debugf("copy dts '%s' (%d files copied) in %v", dts, n, time.Since(start))
}