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api_impl.go
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api_impl.go
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package api
// This file implements most of the API. This includes the "Build", "Transform",
// "FormatMessages", and "AnalyzeMetafile" functions.
import (
"bytes"
"encoding/base64"
"encoding/binary"
"errors"
"fmt"
"io/ioutil"
"math"
"os"
"path"
"regexp"
"sort"
"strconv"
"strings"
"sync"
"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/css_ast"
"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_parser"
"github.com/evanw/esbuild/internal/linker"
"github.com/evanw/esbuild/internal/logger"
"github.com/evanw/esbuild/internal/resolver"
"github.com/evanw/esbuild/internal/xxhash"
)
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]")
case strings.HasPrefix(tail, "[ext]"):
placeholder = config.ExtPlaceholder
search += len("[ext]")
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 PlatformDefault, 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 LoaderBase64:
return config.LoaderBase64
case LoaderBinary:
return config.LoaderBinary
case LoaderCopy:
return config.LoaderCopy
case LoaderCSS:
return config.LoaderCSS
case LoaderDataURL:
return config.LoaderDataURL
case LoaderDefault:
return config.LoaderDefault
case LoaderEmpty:
return config.LoaderEmpty
case LoaderFile:
return config.LoaderFile
case LoaderGlobalCSS:
return config.LoaderGlobalCSS
case LoaderJS:
return config.LoaderJS
case LoaderJSON:
return config.LoaderJSON
case LoaderJSX:
return config.LoaderJSX
case LoaderLocalCSS:
return config.LoaderLocalCSS
case LoaderNone:
return config.LoaderNone
case LoaderText:
return config.LoaderText
case LoaderTS:
return config.LoaderTS
case LoaderTSX:
return config.LoaderTSX
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]+))?(-[A-Za-z0-9]+(?:\.[A-Za-z0-9]+)*)?$`)
func validateFeatures(log logger.Log, target Target, engines []Engine) (compat.JSFeature, compat.CSSFeature, map[css_ast.D]compat.CSSPrefix, string) {
if target == DefaultTarget && len(engines) == 0 {
return 0, 0, nil, ""
}
constraints := make(map[compat.Engine]compat.Semver)
targets := make([]string, 0, 1+len(engines))
switch target {
case ES5:
constraints[compat.ES] = compat.Semver{Parts: []int{5}}
case ES2015:
constraints[compat.ES] = compat.Semver{Parts: []int{2015}}
case ES2016:
constraints[compat.ES] = compat.Semver{Parts: []int{2016}}
case ES2017:
constraints[compat.ES] = compat.Semver{Parts: []int{2017}}
case ES2018:
constraints[compat.ES] = compat.Semver{Parts: []int{2018}}
case ES2019:
constraints[compat.ES] = compat.Semver{Parts: []int{2019}}
case ES2020:
constraints[compat.ES] = compat.Semver{Parts: []int{2020}}
case ES2021:
constraints[compat.ES] = compat.Semver{Parts: []int{2021}}
case ES2022:
constraints[compat.ES] = compat.Semver{Parts: []int{2022}}
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 {
parts := []int{major}
if minor, err := strconv.Atoi(match[2]); err == nil {
parts = append(parts, minor)
if patch, err := strconv.Atoi(match[3]); err == nil {
parts = append(parts, patch)
}
}
constraints[convertEngineName(engine.Name)] = compat.Semver{
Parts: parts,
PreRelease: match[4],
}
continue
}
}
text := "All version numbers passed to esbuild must be in the format \"X\", \"X.Y\", or \"X.Y.Z\" where X, Y, and Z are non-negative integers."
log.AddErrorWithNotes(nil, logger.Range{}, fmt.Sprintf("Invalid version: %q", engine.Version),
[]logger.MsgData{{Text: text}})
}
for engine, version := range constraints {
targets = append(targets, engine.String()+version.String())
}
if target == ESNext {
targets = append(targets, "esnext")
}
sort.Strings(targets)
targetEnv := helpers.StringArrayToQuotedCommaSeparatedString(targets)
return compat.UnsupportedJSFeatures(constraints), compat.UnsupportedCSSFeatures(constraints), compat.CSSPrefixData(constraints), targetEnv
}
func validateSupported(log logger.Log, supported map[string]bool) (
jsFeature compat.JSFeature,
jsMask compat.JSFeature,
cssFeature compat.CSSFeature,
cssMask compat.CSSFeature,
) {
for k, v := range supported {
if js, ok := compat.StringToJSFeature[k]; ok {
jsMask |= js
if !v {
jsFeature |= js
}
} else if css, ok := compat.StringToCSSFeature[k]; ok {
cssMask |= css
if !v {
cssFeature |= css
}
} else {
log.AddError(nil, logger.Range{}, fmt.Sprintf("%q is not a valid feature name for the \"supported\" setting", k))
}
}
return
}
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 validateRegex(log logger.Log, what string, value string) *regexp.Regexp {
if value == "" {
return nil
}
regex, err := regexp.Compile(value)
if err != nil {
log.AddError(nil, logger.Range{},
fmt.Sprintf("The %q setting is not a valid Go regular expression: %s", what, value))
return nil
}
return regex
}
func validateExternals(log logger.Log, fs fs.FS, paths []string) config.ExternalSettings {
result := config.ExternalSettings{
PreResolve: config.ExternalMatchers{Exact: make(map[string]bool)},
PostResolve: config.ExternalMatchers{Exact: make(map[string]bool)},
}
for _, path := range paths {
if index := strings.IndexByte(path, '*'); index != -1 {
// Wildcard behavior
if strings.ContainsRune(path[index+1:], '*') {
log.AddError(nil, logger.Range{}, fmt.Sprintf("External path %q cannot have more than one \"*\" wildcard", path))
} else {
result.PreResolve.Patterns = append(result.PreResolve.Patterns, config.WildcardPattern{Prefix: path[:index], Suffix: path[index+1:]})
if !resolver.IsPackagePath(path) {
if absPath := validatePath(log, fs, path, "external path"); absPath != "" {
if absIndex := strings.IndexByte(absPath, '*'); absIndex != -1 && !strings.ContainsRune(absPath[absIndex+1:], '*') {
result.PostResolve.Patterns = append(result.PostResolve.Patterns, config.WildcardPattern{Prefix: absPath[:absIndex], Suffix: absPath[absIndex+1:]})
}
}
}
}
} else {
// Non-wildcard behavior
result.PreResolve.Exact[path] = true
if resolver.IsPackagePath(path) {
result.PreResolve.Patterns = append(result.PreResolve.Patterns, config.WildcardPattern{Prefix: path + "/"})
} else if absPath := validatePath(log, fs, path, "external path"); absPath != "" {
result.PostResolve.Exact[absPath] = true
}
}
}
return result
}
func esmParsePackageName(packageSpecifier string) (packageName string, packageSubpath string, ok bool) {
if packageSpecifier == "" {
return
}
slash := strings.IndexByte(packageSpecifier, '/')
if !strings.HasPrefix(packageSpecifier, "@") {
if slash == -1 {
slash = len(packageSpecifier)
}
packageName = packageSpecifier[:slash]
} else {
if slash == -1 {
return
}
slash2 := strings.IndexByte(packageSpecifier[slash+1:], '/')
if slash2 == -1 {
slash2 = len(packageSpecifier[slash+1:])
}
packageName = packageSpecifier[:slash+1+slash2]
}
if strings.HasPrefix(packageName, ".") || strings.ContainsAny(packageName, "\\%") {
return
}
packageSubpath = "." + packageSpecifier[len(packageName):]
ok = true
return
}
func validateAlias(log logger.Log, fs fs.FS, alias map[string]string) map[string]string {
valid := make(map[string]string, len(alias))
for old, new := range alias {
if new == "" {
log.AddError(nil, logger.Range{}, fmt.Sprintf("Invalid alias substitution: %q", new))
continue
}
// Valid alias names:
// "foo"
// "foo/bar"
// "@foo"
// "@foo/bar"
// "@foo/bar/baz"
//
// Invalid alias names:
// "./foo"
// "../foo"
// "/foo"
// "C:\\foo"
// ".foo"
// "foo/"
// "@foo/"
// "foo/../bar"
//
if !strings.HasPrefix(old, ".") && !strings.HasPrefix(old, "/") && !fs.IsAbs(old) && path.Clean(strings.ReplaceAll(old, "\\", "/")) == old {
valid[old] = new
continue
}
log.AddError(nil, logger.Range{}, fmt.Sprintf("Invalid alias name: %q", old))
}
return valid
}
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.Range{}, 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 ext != "" && !isValidExtension(ext) {
log.AddError(nil, logger.Range{}, fmt.Sprintf("Invalid file extension: %q", ext))
}
result[ext] = validateLoader(loader)
}
}
return result
}
func validateJSXExpr(log logger.Log, text string, name string) config.DefineExpr {
if text != "" {
if expr, _ := js_parser.ParseDefineExprOrJSON(text); len(expr.Parts) > 0 || (name == "fragment" && expr.Constant != nil) {
return expr
}
log.AddError(nil, logger.Range{}, fmt.Sprintf("Invalid JSX %s: %q", name, text))
}
return config.DefineExpr{}
}
func validateDefines(
log logger.Log,
defines map[string]string,
pureFns []string,
platform config.Platform,
isBuildAPI bool,
minify bool,
drop Drop,
) (*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_ast.IsIdentifier(part) {
if part == key {
log.AddError(nil, logger.Range{}, fmt.Sprintf("The define key %q must be a valid identifier", key))
} else {
log.AddError(nil, logger.Range{}, fmt.Sprintf("The define key %q contains invalid identifier %q", key, part))
}
continue
}
}
// Parse the value
defineExpr, injectExpr := js_parser.ParseDefineExprOrJSON(value)
// Define simple expressions
if defineExpr.Constant != nil || len(defineExpr.Parts) > 0 {
rawDefines[key] = config.DefineData{DefineExpr: &defineExpr}
// Try to be helpful for common mistakes
if len(defineExpr.Parts) == 1 && key == "process.env.NODE_ENV" {
data := logger.MsgData{
Text: fmt.Sprintf("%q is defined as an identifier instead of a string (surround %q with quotes to get a string)", key, value),
}
part := defineExpr.Parts[0]
switch logger.API {
case logger.CLIAPI:
data.Location = &logger.MsgLocation{
File: "<cli>",
Line: 1,
Column: 30,
Length: len(part),
LineText: fmt.Sprintf("--define:process.env.NODE_ENV=%s", part),
Suggestion: fmt.Sprintf("\\\"%s\\\"", part),
}
case logger.JSAPI:
data.Location = &logger.MsgLocation{
File: "<js>",
Line: 1,
Column: 34,
Length: len(part) + 2,
LineText: fmt.Sprintf("define: { 'process.env.NODE_ENV': '%s' }", part),
Suggestion: fmt.Sprintf("'\"%s\"'", part),
}
case logger.GoAPI:
data.Location = &logger.MsgLocation{
File: "<go>",
Line: 1,
Column: 50,
Length: len(part) + 2,
LineText: fmt.Sprintf("Define: map[string]string{\"process.env.NODE_ENV\": \"%s\"}", part),
Suggestion: fmt.Sprintf("\"\\\"%s\\\"\"", part),
}
}
log.AddMsgID(logger.MsgID_JS_SuspiciousDefine, logger.Msg{
Kind: logger.Warning,
Data: data,
})
}
continue
}
// Inject complex expressions
if injectExpr != nil {
definesToInject = append(definesToInject, key)
if valueToInject == nil {
valueToInject = make(map[string]config.InjectedDefine)
}
valueToInject[key] = config.InjectedDefine{
Source: logger.Source{Contents: value},
Data: injectExpr,
Name: key,
}
continue
}
// Anything else is unsupported
log.AddError(nil, logger.Range{}, fmt.Sprintf("Invalid define value (must be an entity name or valid JSON syntax): %s", value))
}
// 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 {
injectedDefines[i] = valueToInject[key]
rawDefines[key] = config.DefineData{DefineExpr: &config.DefineExpr{InjectedDefineIndex: ast.MakeIndex32(uint32(i))}}
}
}
// 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 isBuildAPI && platform == config.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 = helpers.StringToUTF16("production")
} else {
value = helpers.StringToUTF16("development")
}
rawDefines["process.env.NODE_ENV"] = config.DefineData{DefineExpr: &config.DefineExpr{Constant: &js_ast.EString{Value: value}}}
}
}
}
}
// If we're dropping all console API calls, replace each one with undefined
if (drop & DropConsole) != 0 {
define := rawDefines["console"]
define.MethodCallsMustBeReplacedWithUndefined = true
rawDefines["console"] = define
}
for _, key := range pureFns {
// The key must be a dot-separated identifier list
for _, part := range strings.Split(key, ".") {
if !js_ast.IsIdentifier(part) {
log.AddError(nil, logger.Range{}, 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 validateLogOverrides(input map[string]LogLevel) (output map[logger.MsgID]logger.LogLevel) {
output = make(map[uint8]logger.LogLevel)
for k, v := range input {
logger.StringToMsgIDs(k, validateLogLevel(v), output)
}
return
}
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.Range{}, 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.Range{}, fmt.Sprintf("Invalid output extension: %q", value))
}
switch key {
case ".js":
js = value
case ".css":
css = value
default:
log.AddError(nil, logger.Range{}, 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.Range{}, 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{
ID: logger.MsgIDToString(msg.ID),
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{
ID: logger.StringToMaximumMsgID(message.ID),
PluginName: message.PluginName,
Kind: kind,
Data: logger.MsgData{
Text: message.Text,
Location: convertLocationToInternal(message.Location),
UserDetail: message.Detail,
},
Notes: notes,
})
}
return msgs
}
func convertErrorsAndWarningsToInternal(errors []Message, warnings []Message) []logger.Msg {
if len(errors)+len(warnings) > 0 {
msgs := make(logger.SortableMsgs, 0, len(errors)+len(warnings))
msgs = convertMessagesToInternal(msgs, logger.Error, errors)
msgs = convertMessagesToInternal(msgs, logger.Warning, warnings)
sort.Stable(msgs)
return msgs
}
return nil
}
func cloneMangleCache(log logger.Log, mangleCache map[string]interface{}) map[string]interface{} {
if mangleCache == nil {
return nil
}
clone := make(map[string]interface{}, len(mangleCache))
for k, v := range mangleCache {
if v == "__proto__" {
// This could cause problems for our binary serialization protocol. It's
// also unnecessary because we already avoid mangling this property name.
log.AddError(nil, logger.Range{},
fmt.Sprintf("Invalid identifier name %q in mangle cache", k))
} else if _, ok := v.(string); ok || v == false {
clone[k] = v
} else {
log.AddError(nil, logger.Range{},
fmt.Sprintf("Expected %q in mangle cache to map to either a string or false", k))
}
}
return clone
}
////////////////////////////////////////////////////////////////////////////////
// Build API
func contextImpl(buildOpts BuildOptions) (*internalContext, []Message) {
logOptions := logger.OutputOptions{
IncludeSource: true,
MessageLimit: buildOpts.LogLimit,
Color: validateColor(buildOpts.Color),
LogLevel: validateLogLevel(buildOpts.LogLevel),
Overrides: validateLogOverrides(buildOpts.LogOverride),
}
// Validate that the current working directory is an absolute path
absWorkingDir := buildOpts.AbsWorkingDir
realFS, err := fs.RealFS(fs.RealFSOptions{
AbsWorkingDir: absWorkingDir,
// This is a long-lived file system object so do not cache calls to
// ReadDirectory() (they are normally cached for the duration of a build
// for performance).
DoNotCache: true,
})
if err != nil {
log := logger.NewStderrLog(logOptions)
log.AddError(nil, logger.Range{}, err.Error())
return nil, 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.
caches := cache.MakeCacheSet()
log := logger.NewDeferLog(logger.DeferLogNoVerboseOrDebug, logOptions.Overrides)
onEndCallbacks, onDisposeCallbacks, finalizeBuildOptions := loadPlugins(&buildOpts, realFS, log, caches)
options, entryPoints := validateBuildOptions(buildOpts, log, realFS)
finalizeBuildOptions(&options)
if buildOpts.AbsWorkingDir != absWorkingDir {
panic("Mutating \"AbsWorkingDir\" is not allowed")
}
// If we have errors already, then refuse to build any further. This only
// happens when the build options themselves contain validation errors.
msgs := log.Done()
if log.HasErrors() {
if logOptions.LogLevel < logger.LevelSilent {
// Print all deferred validation log messages to stderr. We defer all log
// messages that are generated above because warnings are re-printed for
// every rebuild and we don't want to double-print these warnings for the
// first build.
stderr := logger.NewStderrLog(logOptions)
for _, msg := range msgs {
stderr.AddMsg(msg)
}
stderr.Done()
}
return nil, convertMessagesToPublic(logger.Error, msgs)
}
args := rebuildArgs{
caches: caches,
onEndCallbacks: onEndCallbacks,
onDisposeCallbacks: onDisposeCallbacks,
logOptions: logOptions,
logWarnings: msgs,
entryPoints: entryPoints,
options: options,
mangleCache: buildOpts.MangleCache,
absWorkingDir: absWorkingDir,
write: buildOpts.Write,
}
return &internalContext{
args: args,
realFS: realFS,
absWorkingDir: absWorkingDir,
}, nil
}
type buildInProgress struct {
state rebuildState
waitGroup sync.WaitGroup
cancel config.CancelFlag
}
type internalContext struct {
mutex sync.Mutex
args rebuildArgs
activeBuild *buildInProgress
recentBuild *BuildResult
realFS fs.FS
absWorkingDir string
watcher *watcher
handler *apiHandler
didDispose bool
// This saves just enough information to be able to compute a useful diff
// between two sets of output files. That way we don't need to hold both
// sets of output files in memory at once to compute a diff.
latestHashes map[string]string
}
func (ctx *internalContext) rebuild() rebuildState {
ctx.mutex.Lock()
// Ignore disposed contexts
if ctx.didDispose {
ctx.mutex.Unlock()
return rebuildState{}
}
// If there's already an active build, just return that build's result
if build := ctx.activeBuild; build != nil {
ctx.mutex.Unlock()