api

Documentation

Overview

This API exposes esbuild's two main operations: building and transforming. It's intended for integrating esbuild into other tools as a library.

If you are just trying to run esbuild from Go without the overhead of creating a child process, there is also an API for the command-line interface itself: https://godoc.org/github.com/evanw/esbuild/pkg/cli.

Build API

This function runs an end-to-end build operation. It takes an array of file paths as entry points, parses them and all of their dependencies, and returns the output files to write to the file system. The available options roughly correspond to esbuild's command-line flags.

Example usage:

package main

import (
    "os"

    "github.com/evanw/esbuild/pkg/api"
)

func main() {
    result := api.Build(api.BuildOptions{
        EntryPoints: []string{"input.js"},
        Outfile:     "output.js",
        Bundle:      true,
        Write:       true,
        LogLevel:    api.LogLevelInfo,
    })

    if len(result.Errors) > 0 {
        os.Exit(1)
    }
}

Transform API

This function transforms a string of source code into JavaScript. It can be used to minify JavaScript, convert TypeScript/JSX to JavaScript, or convert newer JavaScript to older JavaScript. The available options roughly correspond to esbuild's command-line flags.

Example usage:

package main

import (
    "fmt"
    "os"

    "github.com/evanw/esbuild/pkg/api"
)

func main() {
    jsx := `
        import * as React from 'react'
        import * as ReactDOM from 'react-dom'

        ReactDOM.render(
            <h1>Hello, world!</h1>,
            document.getElementById('root')
        );
    `

    result := api.Transform(jsx, api.TransformOptions{
        Loader: api.LoaderJSX,
    })

    fmt.Printf("%d errors and %d warnings\n",
        len(result.Errors), len(result.Warnings))

    os.Stdout.Write(result.Code)
}

Index

• type BuildOptions
• type BuildResult
  • func Build(options BuildOptions) BuildResult
• type Charset
• type Engine
• type EngineName
• type Format
• type Loader
• type Location
• type LogLevel
• type Message
• type OnLoadArgs
• type OnLoadOptions
• type OnLoadResult
• type OnResolveArgs
• type OnResolveOptions
• type OnResolveResult
• type OutputFile
• type Platform
• type Plugin
• type PluginBuild
• type ServeOnRequestArgs
• type ServeOptions
• type ServeResult
  • func Serve(serveOptions ServeOptions, buildOptions BuildOptions) (ServeResult, error)
• type SourceMap
• type StderrColor
• type StdinOptions
• type Target
• type TransformOptions
• type TransformResult
  • func Transform(input string, options TransformOptions) TransformResult
• type TreeShaking

Types

type BuildOptions

type BuildOptions struct {
	Color      StderrColor
	ErrorLimit int
	LogLevel   LogLevel

	Sourcemap SourceMap
	Target    Target
	Engines   []Engine

	MinifyWhitespace  bool
	MinifyIdentifiers bool
	MinifySyntax      bool
	Charset           Charset
	TreeShaking       TreeShaking

	JSXFactory  string
	JSXFragment string

	Define    map[string]string
	Pure      []string
	AvoidTDZ  bool
	KeepNames bool

	GlobalName        string
	Bundle            bool
	Splitting         bool
	Outfile           string
	Metafile          string
	Outdir            string
	Outbase           string
	Platform          Platform
	Format            Format
	External          []string
	MainFields        []string
	Loader            map[string]Loader
	ResolveExtensions []string
	Tsconfig          string
	OutExtensions     map[string]string
	PublicPath        string
	Inject            []string
	Banner            string
	Footer            string

	EntryPoints []string
	Stdin       *StdinOptions
	Write       bool
	Incremental bool
	Plugins     []Plugin
}

type BuildResult

type BuildResult struct {
	Errors   []Message
	Warnings []Message

	OutputFiles []OutputFile

	Rebuild func() BuildResult
}

func Build

func Build(options BuildOptions) BuildResult

type Charset

type Charset uint8

const (
	CharsetDefault Charset = iota
	CharsetASCII
	CharsetUTF8
)

type Engine

type Engine struct {
	Name    EngineName
	Version string
}

type EngineName

type EngineName uint8

const (
	EngineChrome EngineName = iota
	EngineEdge
	EngineFirefox
	EngineIOS
	EngineNode
	EngineSafari
)

type Format

type Format uint8

const (
	FormatDefault Format = iota
	FormatIIFE
	FormatCommonJS
	FormatESModule
)

type Loader

type Loader uint8

const (
	LoaderNone Loader = iota
	LoaderJS
	LoaderJSX
	LoaderTS
	LoaderTSX
	LoaderJSON
	LoaderText
	LoaderBase64
	LoaderDataURL
	LoaderFile
	LoaderBinary
	LoaderCSS
	LoaderDefault
)

type Location

type Location struct {
	File      string
	Namespace string
	Line      int // 1-based
	Column    int // 0-based, in bytes
	Length    int // in bytes
	LineText  string
}

type LogLevel

type LogLevel uint8

const (
	LogLevelSilent LogLevel = iota
	LogLevelInfo
	LogLevelWarning
	LogLevelError
)

type Message

type Message struct {
	Text     string
	Location *Location
}

type OnLoadArgs

type OnLoadArgs struct {
	Path      string
	Namespace string
}

type OnLoadOptions

type OnLoadOptions struct {
	Filter    string
	Namespace string
}

type OnLoadResult

type OnLoadResult struct {
	PluginName string

	Errors   []Message
	Warnings []Message

	Contents   *string
	ResolveDir string
	Loader     Loader
}

type OnResolveArgs

type OnResolveArgs struct {
	Path       string
	Importer   string
	Namespace  string
	ResolveDir string
}

type OnResolveOptions

type OnResolveOptions struct {
	Filter    string
	Namespace string
}

type OnResolveResult

type OnResolveResult struct {
	PluginName string

	Errors   []Message
	Warnings []Message

	Path      string
	External  bool
	Namespace string
}

type OutputFile

type OutputFile struct {
	Path     string
	Contents []byte
}

type Platform

type Platform uint8

const (
	PlatformBrowser Platform = iota
	PlatformNode
)

type Plugin

type Plugin struct {
	Name  string
	Setup func(PluginBuild)
}

type PluginBuild

type PluginBuild interface {
	OnResolve(options OnResolveOptions, callback func(OnResolveArgs) (OnResolveResult, error))
	OnLoad(options OnLoadOptions, callback func(OnLoadArgs) (OnLoadResult, error))
}

type ServeOnRequestArgs

type ServeOnRequestArgs struct {
	RemoteAddress string
	Method        string
	Path          string
	Status        int
	TimeInMS      int // The time to generate the response, not to send it
}

type ServeOptions

type ServeOptions struct {
	Port      uint16
	OnRequest func(ServeOnRequestArgs)
}

type ServeResult

type ServeResult struct {
	Port uint16
	Wait func() error
	Stop func()
}

func Serve

func Serve(serveOptions ServeOptions, buildOptions BuildOptions) (ServeResult, error)

type SourceMap

type SourceMap uint8

const (
	SourceMapNone SourceMap = iota
	SourceMapInline
	SourceMapLinked
	SourceMapExternal
)

type StderrColor

type StderrColor uint8

const (
	ColorIfTerminal StderrColor = iota
	ColorNever
	ColorAlways
)

type StdinOptions

type StdinOptions struct {
	Contents   string
	ResolveDir string
	Sourcefile string
	Loader     Loader
}

type Target

type Target uint8

const (
	ESNext Target = iota
	ES5
	ES2015
	ES2016
	ES2017
	ES2018
	ES2019
	ES2020
)

type TransformOptions

type TransformOptions struct {
	Color      StderrColor
	ErrorLimit int
	LogLevel   LogLevel

	Sourcemap  SourceMap
	Target     Target
	Format     Format
	GlobalName string
	Engines    []Engine

	MinifyWhitespace  bool
	MinifyIdentifiers bool
	MinifySyntax      bool
	Charset           Charset
	TreeShaking       TreeShaking

	JSXFactory  string
	JSXFragment string
	TsconfigRaw string
	Footer      string
	Banner      string

	Define    map[string]string
	Pure      []string
	AvoidTDZ  bool
	KeepNames bool

	Sourcefile string
	Loader     Loader
}

type TransformResult

type TransformResult struct {
	Errors   []Message
	Warnings []Message

	Code []byte
	Map  []byte
}

func Transform

func Transform(input string, options TransformOptions) TransformResult

type TreeShaking

type TreeShaking uint8

const (
	TreeShakingDefault TreeShaking = iota
	TreeShakingIgnoreAnnotations
)