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api_impl.go
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api_impl.go
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package api
import (
"fmt"
"io/ioutil"
"math"
"math/rand"
"os"
"regexp"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"unicode/utf8"
"github.com/evanw/esbuild/internal/api_helpers"
"github.com/evanw/esbuild/internal/ast"
"github.com/evanw/esbuild/internal/bundler"
"github.com/evanw/esbuild/internal/cache"
"github.com/evanw/esbuild/internal/compat"
"github.com/evanw/esbuild/internal/config"
"github.com/evanw/esbuild/internal/fs"
"github.com/evanw/esbuild/internal/graph"
"github.com/evanw/esbuild/internal/helpers"
"github.com/evanw/esbuild/internal/js_ast"
"github.com/evanw/esbuild/internal/js_lexer"
"github.com/evanw/esbuild/internal/js_parser"
"github.com/evanw/esbuild/internal/logger"
"github.com/evanw/esbuild/internal/resolver"
)
func validatePathTemplate(template string) []config.PathTemplate {
if template == "" {
return nil
}
template = "./" + strings.ReplaceAll(template, "\\", "/")
parts := make([]config.PathTemplate, 0, 4)
search := 0
// Split by placeholders
for search < len(template) {
// Jump to the next "["
if found := strings.IndexByte(template[search:], '['); found == -1 {
break
} else {
search += found
}
head, tail := template[:search], template[search:]
placeholder := config.NoPlaceholder
// Check for a placeholder
switch {
case strings.HasPrefix(tail, "[dir]"):
placeholder = config.DirPlaceholder
search += len("[dir]")
case strings.HasPrefix(tail, "[name]"):
placeholder = config.NamePlaceholder
search += len("[name]")
case strings.HasPrefix(tail, "[hash]"):
placeholder = config.HashPlaceholder
search += len("[hash]")
default:
// Skip past the "[" so we don't find it again
search++
continue
}
// Add a part for everything up to and including this placeholder
parts = append(parts, config.PathTemplate{
Data: head,
Placeholder: placeholder,
})
// Reset the search after this placeholder
template = template[search:]
search = 0
}
// Append any remaining data as a part without a placeholder
if search < len(template) {
parts = append(parts, config.PathTemplate{
Data: template,
Placeholder: config.NoPlaceholder,
})
}
return parts
}
func validatePlatform(value Platform) config.Platform {
switch value {
case PlatformBrowser:
return config.PlatformBrowser
case PlatformNode:
return config.PlatformNode
case PlatformNeutral:
return config.PlatformNeutral
default:
panic("Invalid platform")
}
}
func validateFormat(value Format) config.Format {
switch value {
case FormatDefault:
return config.FormatPreserve
case FormatIIFE:
return config.FormatIIFE
case FormatCommonJS:
return config.FormatCommonJS
case FormatESModule:
return config.FormatESModule
default:
panic("Invalid format")
}
}
func validateSourceMap(value SourceMap) config.SourceMap {
switch value {
case SourceMapNone:
return config.SourceMapNone
case SourceMapLinked:
return config.SourceMapLinkedWithComment
case SourceMapInline:
return config.SourceMapInline
case SourceMapExternal:
return config.SourceMapExternalWithoutComment
case SourceMapInlineAndExternal:
return config.SourceMapInlineAndExternal
default:
panic("Invalid source map")
}
}
func validateLegalComments(value LegalComments, bundle bool) config.LegalComments {
switch value {
case LegalCommentsDefault:
if bundle {
return config.LegalCommentsEndOfFile
} else {
return config.LegalCommentsInline
}
case LegalCommentsNone:
return config.LegalCommentsNone
case LegalCommentsInline:
return config.LegalCommentsInline
case LegalCommentsEndOfFile:
return config.LegalCommentsEndOfFile
case LegalCommentsLinked:
return config.LegalCommentsLinkedWithComment
case LegalCommentsExternal:
return config.LegalCommentsExternalWithoutComment
default:
panic("Invalid source map")
}
}
func validateColor(value StderrColor) logger.UseColor {
switch value {
case ColorIfTerminal:
return logger.ColorIfTerminal
case ColorNever:
return logger.ColorNever
case ColorAlways:
return logger.ColorAlways
default:
panic("Invalid color")
}
}
func validateLogLevel(value LogLevel) logger.LogLevel {
switch value {
case LogLevelVerbose:
return logger.LevelVerbose
case LogLevelDebug:
return logger.LevelDebug
case LogLevelInfo:
return logger.LevelInfo
case LogLevelWarning:
return logger.LevelWarning
case LogLevelError:
return logger.LevelError
case LogLevelSilent:
return logger.LevelSilent
default:
panic("Invalid log level")
}
}
func validateASCIIOnly(value Charset) bool {
switch value {
case CharsetDefault, CharsetASCII:
return true
case CharsetUTF8:
return false
default:
panic("Invalid charset")
}
}
func validateTreeShaking(value TreeShaking, bundle bool, format Format) bool {
switch value {
case TreeShakingDefault:
// If we're in an IIFE then there's no way to concatenate additional code
// to the end of our output so we assume tree shaking is safe. And when
// bundling we assume that tree shaking is safe because if you want to add
// code to the bundle, you should be doing that by including it in the
// bundle instead of concatenating it afterward, so we also assume tree
// shaking is safe then. Otherwise we assume tree shaking is not safe.
return bundle || format == FormatIIFE
case TreeShakingFalse:
return false
case TreeShakingTrue:
return true
default:
panic("Invalid tree shaking")
}
}
func validateLoader(value Loader) config.Loader {
switch value {
case LoaderNone:
return config.LoaderNone
case LoaderJS:
return config.LoaderJS
case LoaderJSX:
return config.LoaderJSX
case LoaderTS:
return config.LoaderTS
case LoaderTSX:
return config.LoaderTSX
case LoaderJSON:
return config.LoaderJSON
case LoaderText:
return config.LoaderText
case LoaderBase64:
return config.LoaderBase64
case LoaderDataURL:
return config.LoaderDataURL
case LoaderFile:
return config.LoaderFile
case LoaderBinary:
return config.LoaderBinary
case LoaderCSS:
return config.LoaderCSS
case LoaderDefault:
return config.LoaderDefault
default:
panic("Invalid loader")
}
}
func validateEngine(value EngineName) compat.Engine {
switch value {
case EngineChrome:
return compat.Chrome
case EngineEdge:
return compat.Edge
case EngineFirefox:
return compat.Firefox
case EngineIOS:
return compat.IOS
case EngineNode:
return compat.Node
case EngineSafari:
return compat.Safari
default:
panic("Invalid loader")
}
}
var versionRegex = regexp.MustCompile(`^([0-9]+)(?:\.([0-9]+))?(?:\.([0-9]+))?$`)
func validateFeatures(log logger.Log, target Target, engines []Engine) (bool, compat.JSFeature, compat.CSSFeature, string) {
if target == DefaultTarget && len(engines) == 0 {
return true, 0, 0, ""
}
constraints := make(map[compat.Engine][]int)
targets := make([]string, 0, 1+len(engines))
switch target {
case ES5:
constraints[compat.ES] = []int{5}
case ES2015:
constraints[compat.ES] = []int{2015}
case ES2016:
constraints[compat.ES] = []int{2016}
case ES2017:
constraints[compat.ES] = []int{2017}
case ES2018:
constraints[compat.ES] = []int{2018}
case ES2019:
constraints[compat.ES] = []int{2019}
case ES2020:
constraints[compat.ES] = []int{2020}
case ES2021:
constraints[compat.ES] = []int{2021}
case ESNext, DefaultTarget:
default:
panic("Invalid target")
}
for _, engine := range engines {
if match := versionRegex.FindStringSubmatch(engine.Version); match != nil {
if major, err := strconv.Atoi(match[1]); err == nil {
version := []int{major}
if minor, err := strconv.Atoi(match[2]); err == nil {
version = append(version, minor)
}
if patch, err := strconv.Atoi(match[3]); err == nil {
version = append(version, patch)
}
switch engine.Name {
case EngineChrome:
constraints[compat.Chrome] = version
case EngineEdge:
constraints[compat.Edge] = version
case EngineFirefox:
constraints[compat.Firefox] = version
case EngineIOS:
constraints[compat.IOS] = version
case EngineNode:
constraints[compat.Node] = version
case EngineSafari:
constraints[compat.Safari] = version
default:
panic("Invalid engine name")
}
continue
}
}
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid version: %q", engine.Version))
}
for engine, version := range constraints {
var text string
switch len(version) {
case 1:
text = fmt.Sprintf("%s%d", engine.String(), version[0])
case 2:
text = fmt.Sprintf("%s%d.%d", engine.String(), version[0], version[1])
case 3:
text = fmt.Sprintf("%s%d.%d.%d", engine.String(), version[0], version[1], version[2])
}
targets = append(targets, fmt.Sprintf("%q", text))
}
sort.Strings(targets)
targetEnv := strings.Join(targets, ", ")
return false, compat.UnsupportedJSFeatures(constraints), compat.UnsupportedCSSFeatures(constraints), targetEnv
}
func validateGlobalName(log logger.Log, text string) []string {
if text != "" {
source := logger.Source{
KeyPath: logger.Path{Text: "(global path)"},
PrettyPath: "(global name)",
Contents: text,
}
if result, ok := js_parser.ParseGlobalName(log, source); ok {
return result
}
}
return nil
}
func validateExternals(log logger.Log, fs fs.FS, paths []string) config.ExternalModules {
result := config.ExternalModules{
NodeModules: make(map[string]bool),
AbsPaths: make(map[string]bool),
}
for _, path := range paths {
if index := strings.IndexByte(path, '*'); index != -1 {
if strings.ContainsRune(path[index+1:], '*') {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("External path %q cannot have more than one \"*\" wildcard", path))
} else {
result.Patterns = append(result.Patterns, config.WildcardPattern{
Prefix: path[:index],
Suffix: path[index+1:],
})
}
} else if resolver.IsPackagePath(path) {
result.NodeModules[path] = true
} else if absPath := validatePath(log, fs, path, "external path"); absPath != "" {
result.AbsPaths[absPath] = true
}
}
return result
}
func isValidExtension(ext string) bool {
return len(ext) >= 2 && ext[0] == '.' && ext[len(ext)-1] != '.'
}
func validateResolveExtensions(log logger.Log, order []string) []string {
if order == nil {
return []string{".tsx", ".ts", ".jsx", ".js", ".css", ".json"}
}
for _, ext := range order {
if !isValidExtension(ext) {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid file extension: %q", ext))
}
}
return order
}
func validateLoaders(log logger.Log, loaders map[string]Loader) map[string]config.Loader {
result := bundler.DefaultExtensionToLoaderMap()
if loaders != nil {
for ext, loader := range loaders {
if !isValidExtension(ext) {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid file extension: %q", ext))
}
result[ext] = validateLoader(loader)
}
}
return result
}
func validateJSXExpr(log logger.Log, text string, name string, kind js_parser.JSXExprKind) config.JSXExpr {
if expr, ok := js_parser.ParseJSXExpr(text, kind); ok {
return expr
}
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid JSX %s: %q", name, text))
return config.JSXExpr{}
}
func validateDefines(
log logger.Log,
defines map[string]string,
pureFns []string,
platform Platform,
minify bool,
) (*config.ProcessedDefines, []config.InjectedDefine) {
rawDefines := make(map[string]config.DefineData)
var valueToInject map[string]config.InjectedDefine
var definesToInject []string
for key, value := range defines {
// The key must be a dot-separated identifier list
for _, part := range strings.Split(key, ".") {
if !js_lexer.IsIdentifier(part) {
if part == key {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("The define key %q must be a valid identifier", key))
} else {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("The define key %q contains invalid identifier %q", key, part))
}
continue
}
}
// Allow substituting for an identifier
if js_lexer.IsIdentifier(value) {
if _, ok := js_lexer.Keywords[value]; !ok {
name := value // The closure must close over a variable inside the loop
rawDefines[key] = config.DefineData{
DefineFunc: func(args config.DefineArgs) js_ast.E {
return &js_ast.EIdentifier{Ref: args.FindSymbol(args.Loc, name)}
},
}
continue
}
}
// Parse the value as JSON
source := logger.Source{Contents: value}
expr, ok := js_parser.ParseJSON(logger.NewDeferLog(logger.DeferLogAll), source, js_parser.JSONOptions{})
if !ok {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid define value (must be valid JSON syntax or a single identifier): %s", value))
continue
}
var fn config.DefineFunc
switch e := expr.Data.(type) {
// These values are inserted inline, and can participate in constant folding
case *js_ast.ENull:
fn = func(config.DefineArgs) js_ast.E { return js_ast.ENullShared }
case *js_ast.EBoolean:
fn = func(config.DefineArgs) js_ast.E { return &js_ast.EBoolean{Value: e.Value} }
case *js_ast.EString:
fn = func(config.DefineArgs) js_ast.E { return &js_ast.EString{Value: e.Value} }
case *js_ast.ENumber:
fn = func(config.DefineArgs) js_ast.E { return &js_ast.ENumber{Value: e.Value} }
// These values are extracted into a shared symbol reference
case *js_ast.EArray, *js_ast.EObject:
definesToInject = append(definesToInject, key)
if valueToInject == nil {
valueToInject = make(map[string]config.InjectedDefine)
}
valueToInject[key] = config.InjectedDefine{Source: source, Data: e, Name: key}
continue
}
rawDefines[key] = config.DefineData{DefineFunc: fn}
}
// Sort injected defines for determinism, since the imports will be injected
// into every file in the order that we return them from this function
var injectedDefines []config.InjectedDefine
if len(definesToInject) > 0 {
injectedDefines = make([]config.InjectedDefine, len(definesToInject))
sort.Strings(definesToInject)
for i, key := range definesToInject {
index := i // Capture this for the closure below
injectedDefines[i] = valueToInject[key]
rawDefines[key] = config.DefineData{DefineFunc: func(args config.DefineArgs) js_ast.E {
return &js_ast.EIdentifier{Ref: args.SymbolForDefine(index)}
}}
}
}
// If we're bundling for the browser, add a special-cased define for
// "process.env.NODE_ENV" that is "development" when not minifying and
// "production" when minifying. This is a convention from the React world
// that must be handled to avoid all React code crashing instantly. This
// is only done if it's not already defined so that you can override it if
// necessary.
if platform == PlatformBrowser {
if _, process := rawDefines["process"]; !process {
if _, processEnv := rawDefines["process.env"]; !processEnv {
if _, processEnvNodeEnv := rawDefines["process.env.NODE_ENV"]; !processEnvNodeEnv {
var value []uint16
if minify {
value = js_lexer.StringToUTF16("production")
} else {
value = js_lexer.StringToUTF16("development")
}
rawDefines["process.env.NODE_ENV"] = config.DefineData{
DefineFunc: func(args config.DefineArgs) js_ast.E {
return &js_ast.EString{Value: value}
},
}
}
}
}
}
for _, key := range pureFns {
// The key must be a dot-separated identifier list
for _, part := range strings.Split(key, ".") {
if !js_lexer.IsIdentifier(part) {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid pure function: %q", key))
continue
}
}
// Merge with any previously-specified defines
define := rawDefines[key]
define.CallCanBeUnwrappedIfUnused = true
rawDefines[key] = define
}
// Processing defines is expensive. Process them once here so the same object
// can be shared between all parsers we create using these arguments.
processed := config.ProcessDefines(rawDefines)
return &processed, injectedDefines
}
func validatePath(log logger.Log, fs fs.FS, relPath string, pathKind string) string {
if relPath == "" {
return ""
}
absPath, ok := fs.Abs(relPath)
if !ok {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid %s: %s", pathKind, relPath))
}
return absPath
}
func validateOutputExtensions(log logger.Log, outExtensions map[string]string) (js string, css string) {
for key, value := range outExtensions {
if !isValidExtension(value) {
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid output extension: %q", value))
}
switch key {
case ".js":
js = value
case ".css":
css = value
default:
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid output extension: %q (valid: .css, .js)", key))
}
}
return
}
func validateBannerOrFooter(log logger.Log, name string, values map[string]string) (js string, css string) {
for key, value := range values {
switch key {
case "js":
js = value
case "css":
css = value
default:
log.AddError(nil, logger.Loc{}, fmt.Sprintf("Invalid %s file type: %q (valid: css, js)", name, key))
}
}
return
}
func convertLocationToPublic(loc *logger.MsgLocation) *Location {
if loc != nil {
return &Location{
File: loc.File,
Namespace: loc.Namespace,
Line: loc.Line,
Column: loc.Column,
Length: loc.Length,
LineText: loc.LineText,
Suggestion: loc.Suggestion,
}
}
return nil
}
func convertMessagesToPublic(kind logger.MsgKind, msgs []logger.Msg) []Message {
var filtered []Message
for _, msg := range msgs {
if msg.Kind == kind {
var notes []Note
for _, note := range msg.Notes {
notes = append(notes, Note{
Text: note.Text,
Location: convertLocationToPublic(note.Location),
})
}
filtered = append(filtered, Message{
PluginName: msg.PluginName,
Text: msg.Data.Text,
Location: convertLocationToPublic(msg.Data.Location),
Notes: notes,
Detail: msg.Data.UserDetail,
})
}
}
return filtered
}
func convertLocationToInternal(loc *Location) *logger.MsgLocation {
if loc != nil {
namespace := loc.Namespace
if namespace == "" {
namespace = "file"
}
return &logger.MsgLocation{
File: loc.File,
Namespace: namespace,
Line: loc.Line,
Column: loc.Column,
Length: loc.Length,
LineText: loc.LineText,
Suggestion: loc.Suggestion,
}
}
return nil
}
func convertMessagesToInternal(msgs []logger.Msg, kind logger.MsgKind, messages []Message) []logger.Msg {
for _, message := range messages {
var notes []logger.MsgData
for _, note := range message.Notes {
notes = append(notes, logger.MsgData{
Text: note.Text,
Location: convertLocationToInternal(note.Location),
})
}
msgs = append(msgs, logger.Msg{
PluginName: message.PluginName,
Kind: kind,
Data: logger.MsgData{
Text: message.Text,
Location: convertLocationToInternal(message.Location),
UserDetail: message.Detail,
},
Notes: notes,
})
}
return msgs
}
////////////////////////////////////////////////////////////////////////////////
// Build API
type internalBuildResult struct {
result BuildResult
options config.Options
watchData fs.WatchData
}
func buildImpl(buildOpts BuildOptions) internalBuildResult {
start := time.Now()
logOptions := logger.OutputOptions{
IncludeSource: true,
MessageLimit: buildOpts.LogLimit,
Color: validateColor(buildOpts.Color),
LogLevel: validateLogLevel(buildOpts.LogLevel),
}
log := logger.NewStderrLog(logOptions)
// Validate that the current working directory is an absolute path
realFS, err := fs.RealFS(fs.RealFSOptions{
AbsWorkingDir: buildOpts.AbsWorkingDir,
})
if err != nil {
log.AddError(nil, logger.Loc{}, err.Error())
return internalBuildResult{result: BuildResult{Errors: convertMessagesToPublic(logger.Error, log.Done())}}
}
// Do not re-evaluate plugins when rebuilding. Also make sure the working
// directory doesn't change, since breaking that invariant would break the
// validation that we just did above.
oldAbsWorkingDir := buildOpts.AbsWorkingDir
plugins, onEndCallbacks := loadPlugins(&buildOpts, realFS, log)
if buildOpts.AbsWorkingDir != oldAbsWorkingDir {
panic("Mutating \"AbsWorkingDir\" is not allowed")
}
internalResult := rebuildImpl(buildOpts, cache.MakeCacheSet(), plugins, onEndCallbacks, logOptions, log, false /* isRebuild */)
// Print a summary of the generated files to stderr. Except don't do
// this if the terminal is already being used for something else.
if logOptions.LogLevel <= logger.LevelInfo && len(internalResult.result.OutputFiles) > 0 &&
buildOpts.Watch == nil && !buildOpts.Incremental && !internalResult.options.WriteToStdout {
printSummary(logOptions, internalResult.result.OutputFiles, start)
}
return internalResult
}
func prettyPrintByteCount(n int) string {
var size string
if n < 1024 {
size = fmt.Sprintf("%db ", n)
} else if n < 1024*1024 {
size = fmt.Sprintf("%.1fkb", float64(n)/(1024))
} else if n < 1024*1024*1024 {
size = fmt.Sprintf("%.1fmb", float64(n)/(1024*1024))
} else {
size = fmt.Sprintf("%.1fgb", float64(n)/(1024*1024*1024))
}
return size
}
func printSummary(logOptions logger.OutputOptions, outputFiles []OutputFile, start time.Time) {
var table logger.SummaryTable = make([]logger.SummaryTableEntry, len(outputFiles))
if len(outputFiles) > 0 {
if cwd, err := os.Getwd(); err == nil {
if realFS, err := fs.RealFS(fs.RealFSOptions{AbsWorkingDir: cwd}); err == nil {
for i, file := range outputFiles {
path, ok := realFS.Rel(realFS.Cwd(), file.Path)
if !ok {
path = file.Path
}
base := realFS.Base(path)
n := len(file.Contents)
table[i] = logger.SummaryTableEntry{
Dir: path[:len(path)-len(base)],
Base: base,
Size: prettyPrintByteCount(n),
Bytes: n,
IsSourceMap: strings.HasSuffix(base, ".map"),
}
}
}
}
}
// Don't print the time taken by the build if we're running under Yarn 1
// since Yarn 1 always prints its own copy of the time taken by each command
for _, env := range os.Environ() {
if strings.HasPrefix(env, "npm_config_user_agent=") && strings.Contains(env, "yarn/1.") {
logger.PrintSummary(logOptions.Color, table, nil)
return
}
}
logger.PrintSummary(logOptions.Color, table, &start)
}
func rebuildImpl(
buildOpts BuildOptions,
caches *cache.CacheSet,
plugins []config.Plugin,
onEndCallbacks []func(*BuildResult),
logOptions logger.OutputOptions,
log logger.Log,
isRebuild bool,
) internalBuildResult {
// Convert and validate the buildOpts
realFS, err := fs.RealFS(fs.RealFSOptions{
AbsWorkingDir: buildOpts.AbsWorkingDir,
WantWatchData: buildOpts.Watch != nil,
})
if err != nil {
// This should already have been checked above
panic(err.Error())
}
isTargetUnconfigured, jsFeatures, cssFeatures, targetEnv := validateFeatures(log, buildOpts.Target, buildOpts.Engines)
outJS, outCSS := validateOutputExtensions(log, buildOpts.OutExtensions)
bannerJS, bannerCSS := validateBannerOrFooter(log, "banner", buildOpts.Banner)
footerJS, footerCSS := validateBannerOrFooter(log, "footer", buildOpts.Footer)
minify := buildOpts.MinifyWhitespace && buildOpts.MinifyIdentifiers && buildOpts.MinifySyntax
defines, injectedDefines := validateDefines(log, buildOpts.Define, buildOpts.Pure, buildOpts.Platform, minify)
options := config.Options{
IsTargetUnconfigured: isTargetUnconfigured,
UnsupportedJSFeatures: jsFeatures,
UnsupportedCSSFeatures: cssFeatures,
OriginalTargetEnv: targetEnv,
JSX: config.JSXOptions{
Preserve: buildOpts.JSXMode == JSXModePreserve,
Factory: validateJSXExpr(log, buildOpts.JSXFactory, "factory", js_parser.JSXFactory),
Fragment: validateJSXExpr(log, buildOpts.JSXFragment, "fragment", js_parser.JSXFragment),
},
Defines: defines,
InjectedDefines: injectedDefines,
Platform: validatePlatform(buildOpts.Platform),
SourceMap: validateSourceMap(buildOpts.Sourcemap),
LegalComments: validateLegalComments(buildOpts.LegalComments, buildOpts.Bundle),
SourceRoot: buildOpts.SourceRoot,
ExcludeSourcesContent: buildOpts.SourcesContent == SourcesContentExclude,
MangleSyntax: buildOpts.MinifySyntax,
RemoveWhitespace: buildOpts.MinifyWhitespace,
MinifyIdentifiers: buildOpts.MinifyIdentifiers,
AllowOverwrite: buildOpts.AllowOverwrite,
ASCIIOnly: validateASCIIOnly(buildOpts.Charset),
IgnoreDCEAnnotations: buildOpts.IgnoreAnnotations,
TreeShaking: validateTreeShaking(buildOpts.TreeShaking, buildOpts.Bundle, buildOpts.Format),
GlobalName: validateGlobalName(log, buildOpts.GlobalName),
CodeSplitting: buildOpts.Splitting,
OutputFormat: validateFormat(buildOpts.Format),
AbsOutputFile: validatePath(log, realFS, buildOpts.Outfile, "outfile path"),
AbsOutputDir: validatePath(log, realFS, buildOpts.Outdir, "outdir path"),
AbsOutputBase: validatePath(log, realFS, buildOpts.Outbase, "outbase path"),
NeedsMetafile: buildOpts.Metafile,
EntryPathTemplate: validatePathTemplate(buildOpts.EntryNames),
ChunkPathTemplate: validatePathTemplate(buildOpts.ChunkNames),
AssetPathTemplate: validatePathTemplate(buildOpts.AssetNames),
OutputExtensionJS: outJS,
OutputExtensionCSS: outCSS,
ExtensionToLoader: validateLoaders(log, buildOpts.Loader),
ExtensionOrder: validateResolveExtensions(log, buildOpts.ResolveExtensions),
ExternalModules: validateExternals(log, realFS, buildOpts.External),
TsConfigOverride: validatePath(log, realFS, buildOpts.Tsconfig, "tsconfig path"),
MainFields: buildOpts.MainFields,
Conditions: append([]string{}, buildOpts.Conditions...),
PublicPath: buildOpts.PublicPath,
KeepNames: buildOpts.KeepNames,
InjectAbsPaths: make([]string, len(buildOpts.Inject)),
AbsNodePaths: make([]string, len(buildOpts.NodePaths)),
JSBanner: bannerJS,
JSFooter: footerJS,
CSSBanner: bannerCSS,
CSSFooter: footerCSS,
PreserveSymlinks: buildOpts.PreserveSymlinks,
WatchMode: buildOpts.Watch != nil,
Plugins: plugins,
}
if options.MainFields != nil {
options.MainFields = append([]string{}, options.MainFields...)
}
for i, path := range buildOpts.Inject {
options.InjectAbsPaths[i] = validatePath(log, realFS, path, "inject path")
}
for i, path := range buildOpts.NodePaths {
options.AbsNodePaths[i] = validatePath(log, realFS, path, "node path")
}
entryPoints := make([]bundler.EntryPoint, 0, len(buildOpts.EntryPoints)+len(buildOpts.EntryPointsAdvanced))
for _, ep := range buildOpts.EntryPoints {
entryPoints = append(entryPoints, bundler.EntryPoint{InputPath: ep})
}
for _, ep := range buildOpts.EntryPointsAdvanced {
entryPoints = append(entryPoints, bundler.EntryPoint{InputPath: ep.InputPath, OutputPath: ep.OutputPath})
}
entryPointCount := len(entryPoints)
if buildOpts.Stdin != nil {
entryPointCount++
options.Stdin = &config.StdinInfo{
Loader: validateLoader(buildOpts.Stdin.Loader),
Contents: buildOpts.Stdin.Contents,
SourceFile: buildOpts.Stdin.Sourcefile,
AbsResolveDir: validatePath(log, realFS, buildOpts.Stdin.ResolveDir, "resolve directory path"),
}
}
if options.AbsOutputDir == "" && entryPointCount > 1 {
log.AddError(nil, logger.Loc{},
"Must use \"outdir\" when there are multiple input files")
} else if options.AbsOutputDir == "" && options.CodeSplitting {
log.AddError(nil, logger.Loc{},
"Must use \"outdir\" when code splitting is enabled")
} else if options.AbsOutputFile != "" && options.AbsOutputDir != "" {
log.AddError(nil, logger.Loc{}, "Cannot use both \"outfile\" and \"outdir\"")
} else if options.AbsOutputFile != "" {
// If the output file is specified, use it to derive the output directory
options.AbsOutputDir = realFS.Dir(options.AbsOutputFile)
} else if options.AbsOutputDir == "" {
options.WriteToStdout = true
// Forbid certain features when writing to stdout
if options.SourceMap != config.SourceMapNone && options.SourceMap != config.SourceMapInline {
log.AddError(nil, logger.Loc{}, "Cannot use an external source map without an output path")
}
if options.LegalComments.HasExternalFile() {
log.AddError(nil, logger.Loc{}, "Cannot use linked or external legal comments without an output path")
}
for _, loader := range options.ExtensionToLoader {
if loader == config.LoaderFile {
log.AddError(nil, logger.Loc{}, "Cannot use the \"file\" loader without an output path")
break
}
}
// Use the current directory as the output directory instead of an empty
// string because external modules with relative paths need a base directory.
options.AbsOutputDir = realFS.Cwd()
}
if !buildOpts.Bundle {
// Disallow bundle-only options when not bundling
if len(options.ExternalModules.NodeModules) > 0 || len(options.ExternalModules.AbsPaths) > 0 {
log.AddError(nil, logger.Loc{}, "Cannot use \"external\" without \"bundle\"")
}
} else if options.OutputFormat == config.FormatPreserve {
// If the format isn't specified, set the default format using the platform
switch options.Platform {
case config.PlatformBrowser:
options.OutputFormat = config.FormatIIFE
case config.PlatformNode:
options.OutputFormat = config.FormatCommonJS
case config.PlatformNeutral:
options.OutputFormat = config.FormatESModule
}
}
// Set the output mode using other settings
if buildOpts.Bundle {
options.Mode = config.ModeBundle
} else if options.OutputFormat != config.FormatPreserve {
options.Mode = config.ModeConvertFormat
}
// Code splitting is experimental and currently only enabled for ES6 modules
if options.CodeSplitting && options.OutputFormat != config.FormatESModule {
log.AddError(nil, logger.Loc{}, "Splitting currently only works with the \"esm\" format")
}
var outputFiles []OutputFile
var metafileJSON string
var watchData fs.WatchData
// Stop now if there were errors
resolver := resolver.NewResolver(realFS, log, caches, options)
if !log.HasErrors() {
var timer *helpers.Timer
if api_helpers.UseTimer {
timer = &helpers.Timer{}
}
// Scan over the bundle
bundle := bundler.ScanBundle(log, realFS, resolver, caches, entryPoints, options, timer)
watchData = realFS.WatchData()
// Stop now if there were errors
if !log.HasErrors() {
// Compile the bundle
results, metafile := bundle.Compile(log, options, timer)
// Stop now if there were errors
if !log.HasErrors() {
metafileJSON = metafile
// Flush any deferred warnings now
log.AlmostDone()
if buildOpts.Write {
timer.Begin("Write output files")
if options.WriteToStdout {
// Special-case writing to stdout
if len(results) != 1 {
log.AddError(nil, logger.Loc{}, fmt.Sprintf(
"Internal error: did not expect to generate %d files when writing to stdout", len(results)))
} else if _, err := os.Stdout.Write(results[0].Contents); err != nil {
log.AddError(nil, logger.Loc{}, fmt.Sprintf(
"Failed to write to stdout: %s", err.Error()))
}
} else {
// Write out files in parallel