lambda-service/src/routes/getYamlConfig.js

import extractComments from 'esprima-extract-comments'
import yaml from 'js-yaml'

const debug = require('debug')('umi-build-dev:getYamlConfig')

export default function(code) {
  const comments = extractComments(code)
  return comments
    .slice(0, 1)
    .filter(c => c.value.includes(':') && c.loc.start.line === 1)
    .reduce((memo, item) => {
      const { value } = item
      const v = value.replace(/^(\s+)?\*/gm, '')
      debug(v)
      try {
        const yamlResult = yaml.safeLoad(v)
        return {
          ...memo,
          ...yamlResult
        }
      } catch (e) {
        console.error(`yaml load failed: ${e}`)
      }
      return memo
    }, {})
}