replace node-sass peer dependency with ensureRequire

Author: btjk

lib/process-style/scss.js renamed to lib/compilers/scss-compiler.js

@@ -1,19 +1,23 @@
 const path = require('path')
 const fs = require('fs')
-const sass = require('node-sass')
+const ensureRequire = require('../ensure-require')
+const cwd = process.cwd()
 
 const rewriteImports = (content, filePath) => content.replace(/@import\s+(?:'([^']+)'|"([^"]+)"|([^\s;]+))/g, (entire, single, double, unquoted) => {
   const oldImportPath = single || double || unquoted
   const absoluteImportPath = path.join(path.dirname(filePath), oldImportPath)
   const lastCharacter = entire[entire.length - 1]
   const quote = lastCharacter === "'" || lastCharacter === '"' ? lastCharacter : ''
-  const importPath = path.relative(process.cwd(), absoluteImportPath)
+  const importPath = path.relative(cwd, absoluteImportPath)
   return '@import ' + quote + importPath + quote
 })
 
 module.exports = (content, filePath, config) => {
+  ensureRequire('scss', ['node-sass'])
+  const sass = require('node-sass')
+
   let scssResources = ''
-  if (config.resources && config.resources.scss) {
+  if (config && config.resources && config.resources.scss) {
     scssResources = config.resources.scss
       .map(scssResource => path.resolve(process.cwd(), scssResource))
       .filter(scssResourcePath => fs.existsSync(scssResourcePath))

lib/process-style/stylus.js renamed to lib/compilers/stylus-compiler.js

@@ -3,7 +3,7 @@ const cssExtract = require('extract-from-css')
 module.exports = function processStyle (stylePart, filePath, config) {
   if (!stylePart) return {}
 
-  const processStyleByLang = lang => require('./' + lang)(stylePart.content, filePath, config)
+  const processStyleByLang = lang => require('./compilers/' + lang + '-compiler')(stylePart.content, filePath, config)
 
   let cssCode = stylePart.content
   switch (stylePart.lang) {