ref: 78f227b664d86c30fbb25f7a953b7ef8f2dacf13
dir: /resources/resource_transformers/js/options.go/
// Copyright 2020 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package js
import (
"encoding/json"
"fmt"
"io/ioutil"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/evanw/esbuild/pkg/api"
"github.com/gohugoio/hugo/helpers"
"github.com/gohugoio/hugo/hugofs"
"github.com/gohugoio/hugo/media"
"github.com/mitchellh/mapstructure"
"github.com/spf13/cast"
)
const (
nsImportHugo = "ns-hugo"
nsParams = "ns-params"
stdinImporter = "<stdin>"
)
// Options esbuild configuration
type Options struct {
// If not set, the source path will be used as the base target path.
// Note that the target path's extension may change if the target MIME type
// is different, e.g. when the source is TypeScript.
TargetPath string
// Whether to minify to output.
Minify bool
// Whether to write mapfiles
SourceMap string
// The language target.
// One of: es2015, es2016, es2017, es2018, es2019, es2020 or esnext.
// Default is esnext.
Target string
// The output format.
// One of: iife, cjs, esm
// Default is to esm.
Format string
// External dependencies, e.g. "react".
Externals []string `hash:"set"`
// User defined symbols.
Defines map[string]interface{}
// User defined params. Will be marshaled to JSON and available as "@params", e.g.
// import * as params from '@params';
Params interface{}
// What to use instead of React.createElement.
JSXFactory string
// What to use instead of React.Fragment.
JSXFragment string
// There is/was a bug in WebKit with severe performance issue with the tracking
// of TDZ checks in JavaScriptCore.
//
// Enabling this flag removes the TDZ and `const` assignment checks and
// may improve performance of larger JS codebases until the WebKit fix
// is in widespread use.
//
// See https://bugs.webkit.org/show_bug.cgi?id=199866
AvoidTDZ bool
mediaType media.Type
outDir string
contents string
sourcefile string
resolveDir string
tsConfig string
}
func decodeOptions(m map[string]interface{}) (Options, error) {
var opts Options
if err := mapstructure.WeakDecode(m, &opts); err != nil {
return opts, err
}
if opts.TargetPath != "" {
opts.TargetPath = helpers.ToSlashTrimLeading(opts.TargetPath)
}
opts.Target = strings.ToLower(opts.Target)
opts.Format = strings.ToLower(opts.Format)
return opts, nil
}
var extensionToLoaderMap = map[string]api.Loader{
".js": api.LoaderJS,
".mjs": api.LoaderJS,
".cjs": api.LoaderJS,
".jsx": api.LoaderJSX,
".ts": api.LoaderTS,
".tsx": api.LoaderTSX,
".css": api.LoaderCSS,
".json": api.LoaderJSON,
".txt": api.LoaderText,
}
func loaderFromFilename(filename string) api.Loader {
l, found := extensionToLoaderMap[filepath.Ext(filename)]
if found {
return l
}
return api.LoaderJS
}
func createBuildPlugins(c *Client, opts Options) ([]api.Plugin, error) {
fs := c.rs.Assets
resolveImport := func(args api.OnResolveArgs) (api.OnResolveResult, error) {
isStdin := args.Importer == stdinImporter
var relDir string
if !isStdin {
rel, found := fs.MakePathRelative(args.Importer)
if !found {
// Not in any of the /assets folders.
// This is an import from a node_modules, let
// ESBuild resolve this.
return api.OnResolveResult{}, nil
}
relDir = filepath.Dir(rel)
} else {
relDir = filepath.Dir(opts.sourcefile)
}
impPath := args.Path
// Imports not starting with a "." is assumed to live relative to /assets.
// Hugo makes no assumptions about the directory structure below /assets.
if relDir != "" && strings.HasPrefix(impPath, ".") {
impPath = filepath.Join(relDir, impPath)
}
findFirst := func(base string) hugofs.FileMeta {
// This is the most common sub-set of ESBuild's default extensions.
// We assume that imports of JSON, CSS etc. will be using their full
// name with extension.
for _, ext := range []string{".js", ".ts", ".tsx", ".jsx"} {
if fi, err := fs.Fs.Stat(base + ext); err == nil {
return fi.(hugofs.FileMetaInfo).Meta()
}
}
// Not found.
return nil
}
var m hugofs.FileMeta
// First the path as is.
fi, err := fs.Fs.Stat(impPath)
if err == nil {
if fi.IsDir() {
m = findFirst(filepath.Join(impPath, "index"))
} else {
m = fi.(hugofs.FileMetaInfo).Meta()
}
} else {
// It may be a regular file imported without an extension.
m = findFirst(impPath)
}
//
if m != nil {
// Store the source root so we can create a jsconfig.json
// to help intellisense when the build is done.
// This should be a small number of elements, and when
// in server mode, we may get stale entries on renames etc.,
// but that shouldn't matter too much.
c.rs.JSConfigBuilder.AddSourceRoot(m.SourceRoot())
return api.OnResolveResult{Path: m.Filename(), Namespace: nsImportHugo}, nil
}
// Fall back to ESBuild's resolve.
return api.OnResolveResult{}, nil
}
importResolver := api.Plugin{
Name: "hugo-import-resolver",
Setup: func(build api.PluginBuild) {
build.OnResolve(api.OnResolveOptions{Filter: `.*`},
func(args api.OnResolveArgs) (api.OnResolveResult, error) {
return resolveImport(args)
})
build.OnLoad(api.OnLoadOptions{Filter: `.*`, Namespace: nsImportHugo},
func(args api.OnLoadArgs) (api.OnLoadResult, error) {
b, err := ioutil.ReadFile(args.Path)
if err != nil {
return api.OnLoadResult{}, errors.Wrapf(err, "failed to read %q", args.Path)
}
c := string(b)
return api.OnLoadResult{
// See https://github.com/evanw/esbuild/issues/502
// This allows all modules to resolve dependencies
// in the main project's node_modules.
ResolveDir: opts.resolveDir,
Contents: &c,
Loader: loaderFromFilename(args.Path),
}, nil
})
},
}
params := opts.Params
if params == nil {
// This way @params will always resolve to something.
params = make(map[string]interface{})
}
b, err := json.Marshal(params)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal params")
}
bs := string(b)
paramsPlugin := api.Plugin{
Name: "hugo-params-plugin",
Setup: func(build api.PluginBuild) {
build.OnResolve(api.OnResolveOptions{Filter: `^@params$`},
func(args api.OnResolveArgs) (api.OnResolveResult, error) {
return api.OnResolveResult{
Path: args.Path,
Namespace: nsParams,
}, nil
})
build.OnLoad(api.OnLoadOptions{Filter: `.*`, Namespace: nsParams},
func(args api.OnLoadArgs) (api.OnLoadResult, error) {
return api.OnLoadResult{
Contents: &bs,
Loader: api.LoaderJSON,
}, nil
})
},
}
return []api.Plugin{importResolver, paramsPlugin}, nil
}
func toBuildOptions(opts Options) (buildOptions api.BuildOptions, err error) {
var target api.Target
switch opts.Target {
case "", "esnext":
target = api.ESNext
case "es5":
target = api.ES5
case "es6", "es2015":
target = api.ES2015
case "es2016":
target = api.ES2016
case "es2017":
target = api.ES2017
case "es2018":
target = api.ES2018
case "es2019":
target = api.ES2019
case "es2020":
target = api.ES2020
default:
err = fmt.Errorf("invalid target: %q", opts.Target)
return
}
mediaType := opts.mediaType
if mediaType.IsZero() {
mediaType = media.JavascriptType
}
var loader api.Loader
switch mediaType.SubType {
// TODO(bep) ESBuild support a set of other loaders, but I currently fail
// to see the relevance. That may change as we start using this.
case media.JavascriptType.SubType:
loader = api.LoaderJS
case media.TypeScriptType.SubType:
loader = api.LoaderTS
case media.TSXType.SubType:
loader = api.LoaderTSX
case media.JSXType.SubType:
loader = api.LoaderJSX
default:
err = fmt.Errorf("unsupported Media Type: %q", opts.mediaType)
return
}
var format api.Format
// One of: iife, cjs, esm
switch opts.Format {
case "", "iife":
format = api.FormatIIFE
case "esm":
format = api.FormatESModule
case "cjs":
format = api.FormatCommonJS
default:
err = fmt.Errorf("unsupported script output format: %q", opts.Format)
return
}
var defines map[string]string
if opts.Defines != nil {
defines = cast.ToStringMapString(opts.Defines)
}
// By default we only need to specify outDir and no outFile
var outDir = opts.outDir
var outFile = ""
var sourceMap api.SourceMap
switch opts.SourceMap {
case "inline":
sourceMap = api.SourceMapInline
case "":
sourceMap = api.SourceMapNone
default:
err = fmt.Errorf("unsupported sourcemap type: %q", opts.SourceMap)
return
}
buildOptions = api.BuildOptions{
Outfile: outFile,
Bundle: true,
Target: target,
Format: format,
Sourcemap: sourceMap,
MinifyWhitespace: opts.Minify,
MinifyIdentifiers: opts.Minify,
MinifySyntax: opts.Minify,
Outdir: outDir,
Define: defines,
External: opts.Externals,
JSXFactory: opts.JSXFactory,
JSXFragment: opts.JSXFragment,
AvoidTDZ: opts.AvoidTDZ,
Tsconfig: opts.tsConfig,
Stdin: &api.StdinOptions{
Contents: opts.contents,
Sourcefile: opts.sourcefile,
ResolveDir: opts.resolveDir,
Loader: loader,
},
}
return
}