I am attempting the Introducing a complete toolchain chapter of the Understanding client-side web development tools module of the MDN Front End Developer course. I have reached the final Running the transformation section where the instructions advise to run npx parcel src/index.html. At this stage I encounter two issues.

• The build process gets stuck on Building scheduler-tracing.development.js. After several aborted attempts I let this run for 6 hours before aborting.
• After aborting the process and re-running, I receive the following error:

/home/username/dev/will-it-miss/src/index.css:undefined:undefined: plugin is not a function
at LazyResult.run (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:288:14)
at LazyResult.asyncTick (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:212:26)
at /home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:254:14
at new Promise (<anonymous>)
at LazyResult.async (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:250:23)
at LazyResult.then (/home/username/dev/will-it-miss/node_modules/parcel-bundler/node_modules/postcss/lib/lazy-result.js:131:17)

Being new to development I haven't had much luck in troubleshooting this error but these are the actions taken so far:

• Set index.js script type to module and updated SVG paths as suggested in this thread on the MDN Discourse forum.
• Replaced the postcss specific nested selectors from index.css with regular selectors
• Reverted the project version of postcss to a previous build
• Deleted and rebuilt the project from scratch 5~ times and get the same results (Stuck building scheduler-tracing.development.js, abort process, re-run and error relating to index.css outlined above.

Another user reported the same error I have as shown in the linked forum thread. if there is any other info that could be useful in troubleshooting this error, please let me know.