Bug: `sam build --build-in-source` does not reflect update in local dependency

[hawflau]

Description:

After installing the local package and building , if you update the local package and then build again, it will not be reflected in the node_modules file.

Steps to reproduce:

• Download sam-app.tar.gz, extract it
• Go to the hello-world directory
• install local packages

$ npm install ../utils/custom-response

• build

$ cd ../
$ sam build --build-in-source

• Update local packages (any update is fine)

vi utils/custom-response/index.js

• Build again

$ sam build --build-in-source --no-cached

• Check the packages under the node_modules directory

cat hello-world/node_modules/custom-response/index.js 

Observed result:

=> The content updated in step 5 is not reflected.

Expected result:

=> The content updated in step 5 should be reflected.

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS:
2. sam --version:
3. AWS region:

# Paste the output of `sam --info` here

Add --debug flag to command you are running