We are now using SWC for TypeScript to JavaScript transpilation

[samreid]

As part of phetsims/chipper#1354, we have changed from babel to swc for running the TypeScript to JavaScript transpilation. The process is much faster now.

Steps to upgrade:

1. Stop your current transpiler watch process.
2. Pull all, including chipper
3. npm install in chipper

• Use grunt transpile --watch from any repo to transpile all repos.
• Note that you can just transpile for a sim and its dependencies with grunt output-js-project --watch

Expected output from the --watch task includes many console logs with “Watching for file changes.” That is ok and don’t worry!

Please let us know if you have any questions or problems.