如何在Google Cloud Functions模拟器中读取本地文件?

我的Google Cloud Function需要读取本地文件(图像). 我已经在功能目录树中添加了图像，所以我有:

My Google Cloud Function needs to read a local file (an image). I've added the image in the function directory tree, so I have:

packages.json
src/functions.js
lib/functions.js
img/shower.png

这是我用来阅读的代码:

This is the code I'm using to read it:

var img = await new Jimp.read("../img/shower.png")

现在，当函数触发时，我得到了: 2017-03-30T03:00:25.118Z - error: (node:1685) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open '../img/shower.png'

Now, when the function triggers, I'm getting this: 2017-03-30T03:00:25.118Z - error: (node:1685) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open '../img/shower.png'

我尝试将图像移动到例如我的函数所在的目录(lib/)，但是没有运气.

I've tried moving the image around, eg to the directory where my function resides (lib/) with no luck.

我还记录了process.cwd()，该返回了意外:/usr/local/lib/node_modules/@google-cloud/functions-emulator

I've also logged process.cwd() which returned an unexpected: /usr/local/lib/node_modules/@google-cloud/functions-emulator

有任何提示吗?