@@ -7,49 +7,78 @@ function startsWith(string: string, prefix: string): boolean {
77 return string . lastIndexOf ( prefix , 0 ) === 0 ;
88}
99
10+ type Preset = any ;
11+
1012type BabelConfig = {
11- filename ?: string ,
12- filenameRelative ?: string ,
13- presets ?: Array < string > ,
14- plugins ?: Array < string > ,
15- highlightCode ?: boolean ,
16- only ?: ?( RegExp | string | Array < RegExp | string > ) ,
17- ignore ?: ?( RegExp | string | Array < RegExp | string > ) ,
18- auxiliaryCommentBefore ?: ?string ,
19- auxiliaryCommentAfter ?: ?string ,
20- sourceMaps ?: boolean ,
21- inputSourceMap ?: ?Object ,
22- sourceMapTarget ?: string ,
23- sourceFileName ?string ,
24- sourceRoot ?string ,
25- moduleRoot ?string ,
26- moduleIds ?boolean ,
27- moduleId ?string ,
28- getModuleId ?: ( moduleName : string ) => ?string ,
29- resolveModuleSource ?: ( source : string , filename string ) => ?string ,
30- code ?: boolean ,
31- babelrc ?: boolean ,
32- ast ?: boolean ,
33- compact ?: boolean | 'auto' ,
34- comments ?: boolean ,
35- shouldPrintComment ?: ( commentContents : string ) => boolean ,
36- env ?: { [ key : string ] : BabelConfig } ,
37- retainLines ?: boolean ,
38- extends ?: ?string ,
13+ filename ?: string ;
14+ filenameRelative ?string ;
15+ presets ?: Array < Preset > ;
16+ plugins ?: Array < string > ;
17+ highlightCode ?boolean ;
18+ only ?: ?( RegExp | string | Array < RegExp | string > ) ;
19+ ignore ?: ?( RegExp | string | Array < RegExp | string > ) ;
20+ auxiliaryCommentBefore ?: ?string ;
21+ auxiliaryCommentAfter ?: ?string ;
22+ sourceMaps ?: boolean ;
23+ inputSourceMap ?: ?Object ;
24+ sourceMapTarget ?: string ;
25+ sourceFileName ?: string ;
26+ sourceRoot ?: string ;
27+ moduleRoot ?: string ;
28+ moduleIds ?: boolean ;
29+ moduleId ?: string ;
30+ getModuleId ?: ( moduleName : string ) => ?string ;
31+ resolveModuleSource ?: ( source : string , filename : string ) => ?string ;
32+ code ?: boolean ;
33+ babelrc ?: boolean ;
34+ ast ?: boolean ;
35+ compact ?: boolean | 'auto' ;
36+ comments ?: boolean ;
37+ shouldPrintComment ?: ( commentContents : string ) => boolean ;
38+ env ?: { [ key : string ] : BabelConfig } ;
39+ retainLines ?: boolean ;
40+ extends ?: ?string ;
41+ } ;
42+
43+ type Options = {
44+ path ?: string ;
45+ config ?: BabelConfig ;
46+ findRollupPresets ?: boolean ;
47+ addModuleOptions ?: boolean ;
48+ addExternalHelpersPlugin ?: boolean ;
49+ resolve ?: ( path : string ) => string ;
3950} ;
4051
41- export default function babelrc ( path : string = '.babelrc' ) : BabelConfig {
42- return configWithoutModules ( JSON . parse ( readFileSync ( path , { encoding : 'utf8' } ) ) ) ;
52+ const DEFAULT_OPTIONS = {
53+ path : '.babelrc' ,
54+ findRollupPresets : false ,
55+ addModuleOptions : true ,
56+ addExternalHelpersPlugin : true ,
57+ resolve
58+ } ;
59+
60+ export default function babelrc ( options : Options | string = { } ) : BabelConfig {
61+ if ( typeof options === 'string' ) {
62+ options = { path : options } ;
63+ }
64+
65+ let resolvedOptions = { ...DEFAULT_OPTIONS , ...options } ;
66+
67+ if ( ! resolvedOptions . config && typeof resolvedOptions . path === 'string' ) {
68+ resolvedOptions . config = JSON . parse ( readFileSync ( resolvedOptions . path , { encoding : 'utf8' } ) ) ;
69+ }
70+
71+ return configWithoutModules ( resolvedOptions . config , resolvedOptions ) ;
4372}
4473
45- export function configWithoutModules ( config : BabelConfig ) : BabelConfig {
74+ export function configWithoutModules ( config : BabelConfig , options : Options ) : BabelConfig {
4675 let result = { } ;
4776
4877 for ( let key in config ) {
4978 if ( Object . prototype . hasOwnProperty . call ( config , key ) ) {
5079 if ( key === 'presets' && config . presets ) {
5180 // Replace the es2015 preset with the es2015-rollup preset.
52- result . presets = config . presets . map ( mapPreset ) ;
81+ result . presets = config . presets . map ( preset => mapPreset ( preset , options ) ) ;
5382 } else if ( key === 'plugins' && config . plugins ) {
5483 // Remove any explicit module plugins, e.g. es2015-modules-commonjs.
5584 result . plugins = config . plugins . filter (
@@ -61,18 +90,57 @@ export function configWithoutModules(config: BabelConfig): BabelConfig {
6190 }
6291 }
6392
93+ if ( options . addExternalHelpersPlugin ) {
94+ if ( ! result . plugins ) {
95+ result . plugins = [ 'external-helpers' ] ;
96+ } else {
97+ result . plugins = [ ...result . plugins , 'external-helpers' ] ;
98+ }
99+ }
100+
64101 // Make sure babel does not look for the babelrc file.
65102 result . babelrc = false ;
66103
67104 return result ;
68105}
69106
70- function mapPreset ( preset : string ) : string {
107+ function mapPreset ( preset : any , options : Options ) : any {
108+ let info = getPresetInfo ( preset ) ;
109+
110+ if ( ! info ) {
111+ return preset ;
112+ }
113+
114+ if ( options . findRollupPresets && hasRollupVersionOfPreset ( info . name , options . resolve || resolve ) ) {
115+ return [ `${ info . name } , info . options ] ;
116+ } else if ( options . addModuleOptions ) {
117+ return [ info . name , { ...info . options , modules : false } ] ;
118+ } else {
119+ return preset ;
120+ }
121+ }
122+
123+ function getPresetInfo ( preset : any ) : ?{ name : string , options : Object } {
124+ if ( typeof preset === 'string' ) {
125+ return { name : preset , options : { } } ;
126+ } else if ( Array . isArray ( preset ) ) {
127+ let name = preset [ 0 ] ;
128+ let options = preset [ 1 ] || { } ;
129+
130+ if ( typeof name === 'string' && typeof options === 'object' ) {
131+ return { name , options } ;
132+ }
133+ }
134+
135+ return null ;
136+ }
137+
138+ function hasRollupVersionOfPreset ( preset : string , resolve : ( path : string ) = > string ) : boolean {
71139 try {
72140 // this will throw if it can't resolve it
73141 resolve ( `babel-preset-${ preset } ) ;
74- return ` ${ preset } -rollup` ;
142+ return true ;
75143 } catch ( err ) {
76- return preset ;
144+ return false ;
77145 }
78146}
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