feat: support loading babel.config.js

Author: yyx990803

lib/load-babel-config.js

@@ -1,7 +1,8 @@
 const findBabelConfig = require('find-babel-config')
 const logger = require('./logger')
 const cache = require('./cache')
-const { readFileSync } = require('fs')
+const path = require('path')
+const { readFileSync, existsSync } = require('fs')
 
 module.exports = function getBabelConfig (vueJestConfig) {
   const cachedConfig = cache.get('babel-config')
@@ -14,6 +15,8 @@ module.exports = function getBabelConfig (vueJestConfig) {
 
     if (vueJestConfig.babelRcFile) {
       babelConfig = JSON.parse(readFileSync(vueJestConfig.babelRcFile))
+    } else if (existsSync('babel.config.js')) {
+      babelConfig = require(path.resolve('babel.config.js'))
     } else {
       const { file, config } = findBabelConfig.sync(process.cwd(), 0)
 

test/load-babel-config.spec.js

@@ -64,4 +64,15 @@ describe('load-babel-config.js', () => {
       throw err
     }
   })
+
+  it('supports babel.config.js', () => {
+    const babelConfigPath = resolve(__dirname, '../babel.config.js')
+    const config = {
+      plugins: ['foo']
+    }
+    writeFileSync(babelConfigPath, `module.exports = ${JSON.stringify(config)}`)
+    const babelConfig = loadBabelConfig({})
+    expect(babelConfig).toEqual(config)
+    unlinkSync(babelConfigPath)
+  })
 })