Follow https://www.typescriptlang.org/docs/handbook/migrating-from-javascript.html
[X] Enable use of ts files
[X] ESM instead of CommonJS modules #371
[ ] Flip ts-check / ts-nocheck #334
[ ] Remove all ts-nocheck
[ ] Remove all ts-ignores
[ ] Start converting leaf dependency files to TS
Follow https://www.typescriptlang.org/docs/handbook/migrating-from-javascript.html
[X] Enable use of ts files
[X] ESM instead of CommonJS modules #371
[ ] Flip ts-check / ts-nocheck #334
[ ] Remove all ts-nocheck
[ ] Remove all ts-ignores
[ ] Start converting leaf dependency files to TS