📦️ move from swc to parcel for building

Removed `swc` and `@swc/core` from the project and replaced it with
`parcel` for building the project. `@swc/jest` is still used for testing.
Configure parcel to build the project as an ES module. Create a new tsconfig
file as it was required. Take the opportunity to migrate .js script files to
.mjs files.

Author: qd-qd

.gitignore

@@ -4,8 +4,11 @@
 # javascript dependencies
 node_modules
 
-# swc output directory
+# build output directory
 dist
 
 # test coverage generated by jest
 coverage
+
+# cache generated by parcel
+.parcel-cache

.prettierignore

@@ -1,4 +1,4 @@
-# swc output directory
+# build output directory
 dist
 
 # test coverage generated by jest

jest.config.js renamed to jest.config.mjs

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   transform: {
     "^.+\\.(t|j)sx?$": "@swc/jest",
   },