Rename strings in files

sorry not had time to document this better..

The problem..

• Packaging a react app build folder into a docker image sucks
• Building different variants of this into discrete different directories can only scale so far
• CI/CD stage needs to execute many (inefficient ) npm run build runs
• storing different folders that have tiny differences suck

Solution

1. Run the build once
2. ensure all REACT_APP_ env vars have consistent values.. EG: REACT_APP_FOO will have the default value of DEFAULT_VALUE_FOO

When booting the container 3. loop over all env vars (eg REACT_APP_FOO) 4. substitute the values inside the files with the env vars of the container

blerb

This tool simply evaluates all ENV vars with the prefix of REACT_APP_ and does some file rewriting..

For example you have the env var REACT_APP_FOO = BAR set The script will:

• find all files in the subdir
• rename all strings in the files if they are called DEFAULT_VALUE_FOO

TLDR

• when adding new REACT_APP_X variables to you files, ensure to build the assets with a default value of DEFAULT_VALUE_X
• why not a simple bash+sed script? a static binary is better to distribute and safer than shell scripting + distributing shell environments into a container

TODO

• needs tests
• ugly exported functions
• gooder docs