perf: store babel config in cache

Author: eddyerburgh

lib/cache.js

@@ -0,0 +1,5 @@
+const NodeCache = require('node-cache')
+
+const cache = new NodeCache()
+
+module.exports = cache

lib/compilers/babel-compiler.js

@@ -1,26 +1,37 @@
 const babel = require('babel-core')
 const findBabelConfig = require('find-babel-config')
 const logger = require('../logger')
+const cache = require('../cache')
 
 var defaultBabelOptions = {
   presets: ['es2015'],
   plugins: ['transform-runtime']
 }
 
-module.exports = function compileBabel (scriptContent, inputSourceMap) {
-  const { file, config } = findBabelConfig.sync(process.cwd(), 0)
-
-  if (!file) {
-    logger.info('no .babelrc found, defaulting to default babel options')
+function getBabelConfig () {
+  const cachedConfig = cache.get('babel-config')
+  if (cachedConfig) {
+    return cachedConfig
+  } else {
+    const { file, config } = findBabelConfig.sync(process.cwd(), 0)
+    if (!file) {
+      logger.info('no .babelrc found, defaulting to default babel options')
+    }
+    const babelConfig = file ? config : defaultBabelOptions
+    cache.set('babel-config', babelConfig)
+    return babelConfig
   }
+}
 
+module.exports = function compileBabel (scriptContent, inputSourceMap) {
   const sourceMapOptions = {
     sourceMaps: true,
-    inputSourceMap: inputSourceMap || null
+    inputSourceMap: inputSourceMap
   }
 
-  const baseBabelOptions = file ? config : defaultBabelOptions
-  const babelOptions = Object.assign(sourceMapOptions, baseBabelOptions)
+  const babelConfig = getBabelConfig()
+
+  const babelOptions = Object.assign(sourceMapOptions, babelConfig)
 
   const res = babel.transform(scriptContent, babelOptions)
 

package.json

@@ -55,6 +55,7 @@
     "convert-source-map": "^1.5.0",
     "find-babel-config": "^1.1.0",
     "js-beautify": "^1.6.14",
+    "node-cache": "^4.1.1",
     "object-assign": "^4.1.1",
     "source-map": "^0.5.6",
     "tsconfig": "^7.0.0",

test/Babel.spec.js

@@ -7,9 +7,11 @@ import {
   writeFileSync,
   renameSync
 } from 'fs'
-const clearModule = require('clear-module')
+import clearModule from 'clear-module'
+import cache from '../lib/cache'
 
 beforeEach(() => {
+  cache.flushAll()
   clearModule.all()
 })
 

yarn.lock

@@ -948,6 +948,10 @@ cliui@^3.2.0:
     strip-ansi "^3.0.1"
     wrap-ansi "^2.0.0"
 
+clone@2.x:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/clone/-/clone-2.1.1.tgz#d217d1e961118e3ac9a4b8bba3285553bf647cdb"
+
 co@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
@@ -2646,7 +2650,7 @@ lodash.templatesettings@^4.0.0:
   dependencies:
     lodash._reinterpolate "~3.0.0"
 
-lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.4, lodash@^4.2.1, lodash@^4.3.0:
+lodash@4.x, lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.4, lodash@^4.2.1, lodash@^4.3.0:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
 
@@ -2781,6 +2785,13 @@ natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
 
+node-cache@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/node-cache/-/node-cache-4.1.1.tgz#08524645ee4039dedc3dcc1dd7c6b979e0619e44"
+  dependencies:
+    clone "2.x"
+    lodash "4.x"
+
 node-fetch@^1.0.1:
   version "1.7.2"
   resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-1.7.2.tgz#c54e9aac57e432875233525f3c891c4159ffefd7"