feat: renderSync, parseAndRenderSync and renderFileSync, see #48

src/fs/node.ts

@@ -1,6 +1,6 @@
 import * as _ from '../util/underscore'
 import { resolve, extname } from 'path'
-import { stat, readFile } from 'fs'
+import { stat, statSync, readFile, readFileSync } from 'fs'
 import IFS from './ifs'
 
 const statAsync = _.promisify(stat)
@@ -13,6 +13,17 @@ const fs: IFS = {
   readFile: filepath => {
     return readFileAsync(filepath, 'utf8')
   },
+  existsSync: (filepath: string) => {
+    try {
+      statSync(filepath)
+      return true
+    } catch (err) {
+      return false
+    }
+  },
+  readFileSync: filepath => {
+    return readFileSync(filepath, 'utf8')
+  },
   resolve: (root: string, file: string, ext: string) => {
     if (!extname(file)) file += ext
     return resolve(root, file)