package api

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

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 (
    "fmt"
    "io/ioutil"

    "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.JS)
}

Index

Types

type BuildOptions 

type BuildOptions struct {
	Color      StderrColor
	ErrorLimit int
	LogLevel   LogLevel

	Sourcemap SourceMap
	Target    Target
	Engines   []Engine
	Strict    StrictOptions

	MinifyWhitespace  bool
	MinifyIdentifiers bool
	MinifySyntax      bool

	JSXFactory  string
	JSXFragment string

	Defines       map[string]string
	PureFunctions []string

	GlobalName        string
	Bundle            bool
	Splitting         bool
	Outfile           string
	Metafile          string
	Outdir            string
	Platform          Platform
	Format            Format
	Externals         []string
	Loaders           map[string]Loader
	ResolveExtensions []string
	Tsconfig          string
	OutExtensions     map[string]string

	EntryPoints []string
	Stdin       *StdinOptions
	Write       bool
}

type BuildResult 

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

	OutputFiles []OutputFile
}

func Build 

func Build(options BuildOptions) BuildResult

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 (
	LoaderJS Loader = iota
	LoaderJSX
	LoaderTS
	LoaderTSX
	LoaderJSON
	LoaderText
	LoaderBase64
	LoaderDataURL
	LoaderFile
	LoaderBinary
)

type Location 

type Location struct {
	File     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 OutputFile 

type OutputFile struct {
	Path     string
	Contents []byte
}

type Platform 

type Platform uint8
const (
	PlatformBrowser Platform = iota
	PlatformNode
)

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 StrictOptions 

type StrictOptions struct {
	NullishCoalescing bool
	OptionalChaining  bool
	ClassFields       bool
}

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
	Strict     StrictOptions

	MinifyWhitespace  bool
	MinifyIdentifiers bool
	MinifySyntax      bool

	JSXFactory  string
	JSXFragment string

	Defines       map[string]string
	PureFunctions []string

	Sourcefile string
	Loader     Loader
}

type TransformResult 

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

	JS          []byte
	JSSourceMap []byte
}

func Transform 

func Transform(input string, options TransformOptions) TransformResult

Source Files

api.go api_impl.go

Version
v0.6.33
Published
Sep 9, 2020
Platform
windows/amd64
Imports
17 packages
Last checked
4 hours ago –

Tools for package owners.