This repository used to demonstrate a Babel string literal source mapping issue: babel/babel#10869.

The issue has been blocking https://github.com/TomasHubelbauer/cra-ast-localize and has since been fixed so the repository has shifted to demonstrate a minimal TypeScript transformer which visits all string literals and replaces their text which is the purpose of the linked repository that was blocked by the issue.

First time setup:

cd demo
npm install
cd ..
npm install

Running the demo: npm start.

This will run Babel to transform the source code in src into the source code in lib and then will run the demo script in demo which runs the TypeScript tranformer.

The transformer changes the string literals in the files in lib so after the npm start command has run, you can inspect them and see the additional TEST markers surrounding the original strings that were added by the transformer.

npm install @babel/cli @babel/core @babel/preset-env @babel/preset-react
cd demo
npm install source-map typescript