Repository: create-react-app
Issue: Different Hash Names in AWS CodePipeline
Labels: issue: bug

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### Is this a bug report?

Yes

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### Did you try recovering your dependencies?

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Yes


### Which terms did you search for in User Guide?

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Deployment, static files, hosting


### Environment

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```Environment Info:
 System:
 OS: Linux 4.14 Ubuntu 14.04.5 LTS, Trusty Tahr
 CPU: x64 Intel(R) Xeon(R) CPU E5-2666 v3 @ 2.90GHz
 Binaries:
 Node: 10.14.0 - /usr/bin/node
 npm: 6.4.1 - /usr/bin/npm
 npmPackages:
 react: 16.8.4 => 16.8.4
 react-dom: 16.8.4 => 16.8.4
 react-scripts: 2.1.8 => 2.1.8
 npmGlobalPackages:
 create-react-app: Not Found
```

### Steps to Reproduce

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1. Make changes to my CRA App
2. Commit those changes to github
3. Codepipeline sees changes and kicks off the build process in 2 different regions (us-east-1 and us-east-2)


### Expected Behavior

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Based on the docs, I would expect the "contenthash" values on both of my builds to be the same for my main.js, main.css and chunk.js files.

### Actual Behavior

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On the 2 different boxes, my app builds successfully, but the hashnames are totally different.

I know this is happening because CodePipeline is bringing my code into a directory that they are creating dynamically. The "hash" is based on the directory that the code is built in.

### Reproducible Demo

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Clone the CRA base into a local working directory (./cra1 as an example).
Clone it again into another local working directory (./cra2 as an example).

Run `npm run build` on both folders.

Note the "compiled" filenames are different but their content is the same.

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