old_contents: 'use strict'
  
  import validateKey from 'firebase-validate-key'
  import extend from 'xtend'
  import find from 'babel-runtime/core-js/array/find'
  import * as serverValue from 'firebase-server-value'
  
  export default function valueToFirebase (value) {
    if (typeof value === 'undefined') {
      throw new Error('Firebase cannot accept undefined values')
    }
    if (typeof value === 'function') {
      throw new Error(`Firebase cannot accept function values: ${value.toString()}`)
    }
    if (value instanceof Date || value instanceof RegExp || value === null) {
      return null
    }
    if (typeof value === 'object') {
      if (serverValue.is(value)) return serverValue.parse(value)
      if (Array.isArray(value)) {
        if (!value.length) return null
        value = extend({}, value)
      }
      const keys = Object.keys(value)
      if (!keys.length) return null
      keys.forEach(validateKey)
    }
    return value
  }
  
  export const sv = serverValue
  
new_contents: 'use strict'
  
  import validateKey from 'firebase-validate-key'
  import extend from 'xtend'
  import find from 'babel-runtime/core-js/array/find'
  import * as serverValue from 'firebase-server-value'
  
  export default function valueToFirebase (value) {
    if (typeof value === 'undefined') {
      throw new Error('Firebase cannot accept undefined values')
    }
    if (typeof value === 'function') {
      throw new Error(`Firebase cannot accept function values: ${value.toString()}`)
    }
    if (value instanceof Date || value instanceof RegExp || value === null) {
      return null
    }
    if (typeof value === 'object') {
      if (serverValue.is(value)) return serverValue.parse(value)
      if (Array.isArray(value)) {
        if (!value.length) return null
        value = extend({}, value)
      }
      const keys = Object.keys(value)
      if (!keys.length) return null
      keys.forEach(validateKey)
    }
    return value
  }
  
  valueToFirebase.sv = sv
  
subject: Fix exports so module.exports is defined