stylePreprocessors.ts
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import merge from 'merge-source-map'
import { RawSourceMap } from 'source-map'
import { isFunction } from 'shared/util'
export type StylePreprocessor = (
source: string,
map: RawSourceMap | undefined,
options: {
[key: string]: any
additionalData?: string | ((source: string, filename: string) => string)
filename: string
}
) => StylePreprocessorResults
export interface StylePreprocessorResults {
code: string
map?: object
errors: Error[]
dependencies: string[]
}
// .scss/.sass processor
const scss: StylePreprocessor = (source, map, options) => {
const nodeSass = require('sass')
const finalOptions = {
...options,
data: getSource(source, options.filename, options.additionalData),
file: options.filename,
outFile: options.filename,
sourceMap: !!map
}
try {
const result = nodeSass.renderSync(finalOptions)
const dependencies = result.stats.includedFiles
if (map) {
return {
code: result.css.toString(),
map: merge(map, JSON.parse(result.map.toString())),
errors: [],
dependencies
}
}
return { code: result.css.toString(), errors: [], dependencies }
} catch (e: any) {
return { code: '', errors: [e], dependencies: [] }
}
}
const sass: StylePreprocessor = (source, map, options) =>
scss(source, map, {
...options,
indentedSyntax: true
})
// .less
const less: StylePreprocessor = (source, map, options) => {
const nodeLess = require('less')
let result: any
let error: Error | null = null
nodeLess.render(
getSource(source, options.filename, options.additionalData),
{ ...options, syncImport: true },
(err: Error | null, output: any) => {
error = err
result = output
}
)
if (error) return { code: '', errors: [error], dependencies: [] }
const dependencies = result.imports
if (map) {
return {
code: result.css.toString(),
map: merge(map, result.map),
errors: [],
dependencies: dependencies
}
}
return {
code: result.css.toString(),
errors: [],
dependencies: dependencies
}
}
// .styl
const styl: StylePreprocessor = (source, map, options) => {
const nodeStylus = require('stylus')
try {
const ref = nodeStylus(source)
Object.keys(options).forEach(key => ref.set(key, options[key]))
if (map) ref.set('sourcemap', { inline: false, comment: false })
const result = ref.render()
const dependencies = ref.deps()
if (map) {
return {
code: result,
map: merge(map, ref.sourcemap),
errors: [],
dependencies
}
}
return { code: result, errors: [], dependencies }
} catch (e: any) {
return { code: '', errors: [e], dependencies: [] }
}
}
function getSource(
source: string,
filename: string,
additionalData?: string | ((source: string, filename: string) => string)
) {
if (!additionalData) return source
if (isFunction(additionalData)) {
return additionalData(source, filename)
}
return additionalData + source
}
export type PreprocessLang = 'less' | 'sass' | 'scss' | 'styl' | 'stylus'
export const processors: Record<PreprocessLang, StylePreprocessor> = {
less,
sass,
scss,
styl,
stylus: styl
}