refactor: Migrate monorepo to ESM, make various tweaks

[rekmarks]

Extracted from #11
Requires #13
Unblocks #16

In the course of implementing #11, I made various changes to the monorepo that I deemed either necessary or simply beneficial. Here these changes are extracted from #11, which has been separated into this PR and #16. Contains the following changes:

• Upgrade ts-bridge and migrate all packages to ESM
  • In the course of implementing feat: Introduce streams package #11, I ran into a TypeScript project references-related error, because ts-bridge originally did not support this feature. However, ts-bridge recently added support for project references, and updating fixed the problem.
  • This, however, necessitated migrating all monorepo packages to be ESM-first ("type": "module"), and setting TypeScript's moduleResolution algorithm to Node16. So, now the entire monorepo is ESM-first, but any libraries we publish will still be importable in CommonJS, due to ts-bridge.
  • As part of this change, .js files were renamed to .cjs, and .mjs files to .js. The same goes for their .ts equivalents.
    • A notable exception includes the published files in @ocap/shims, which retain their .mjs extensions as a redundancy measure.
• Fix intra-repo path resolution in tests
  • In the /snaps and /core monorepos, Jest's moduleNameMapper option is manually configured to match the paths property in tsconfig.json to ensure that tests use source code as opposed to build outputs.
  • In vite, we accomplish the same by dropping in the plugin vite-tsconfig-paths, with no additional configuration whatsoever.
• Add internal test-utils package
  • Rather than keeping a folder of test utilities at the monorepo root, I decided to just create an internal package for this purpose.
• Set the version of all intra-monorepo dependencies to workspace:^
  • This takes a queue from the Snaps monorepo. In this way, we will never accidentally pull a workspace package from npm.
  • Note that this required stealing some of the Snaps monorepo's constraints for our constraints.pro. However, don't spend too much time on that file, because it will be replaced soon: monorepo: Migrate constraints from Prolog to JavaScript #17
• Externalize endoify.mjs in extension HTML files
  • Introduces our own tiny vite plugin, endoifyHtmlFilesPlugin, that inserts the endoify.mjs in the correct place just before HTML files are built. vite's aggressive optimization and module resolution logic otherwise prevents us from doing this.
• Add clean script to all packages
  • After experiencing some issues with cached builds, I decided to make sure every package has a clean script.

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@ts-bridge/[email protected]	None	0	249 kB	mrten
npm/@ts-bridge/[email protected]	filesystem, unsafe	0	127 kB	mrten
npm/[email protected]	None	0	14.2 kB	terkelg
npm/[email protected]	None	0	68.1 kB	dominik_g
npm/[email protected]	filesystem	0	95.5 kB	aleclarson

🚮 Removed packages: npm/@ts-bridge/[email protected], npm/[email protected]

View full report↗︎

[rekmarks]

@SocketSecurity ignore npm/[email protected] npm/[email protected]

Due to well-known and widely used dev dependency cheerio.

[rekmarks]

Per #17, this file will be removed in the near future.

[SMotaal]

LGTM — I've reviewed the commits and the final changes. I did not spot concerns that would need to be addressed at this point.

Renamed Files

-.eslintrc.js
+.eslintrc.cjs
-.prettierrc.js
+.prettierrc.cjs
 .yarn/plugins/@yarnpkg/plugin-allow-scripts.cjs
-packages/extension/.eslintrc.js
+packages/extension/.eslintrc.cjs
 packages/extension/src/background.ts
-packages/extension/src/dev-console.mjs
+packages/extension/src/dev-console.js
 packages/extension/src/iframe-manager.test.ts
 packages/extension/src/iframe-manager.ts
 packages/extension/src/iframe.ts
 packages/extension/src/offscreen.ts
 packages/extension/src/shared.test.ts
 packages/extension/src/shared.ts
-packages/extension/vite.config.mts
+packages/extension/vite.config.ts
-packages/extension/vitest.config.mts
+packages/extension/vitest.config.ts
-packages/shims/.eslintrc.js
+packages/shims/.eslintrc.cjs
-packages/shims/scripts/bundle.mjs
+packages/shims/scripts/bundle.js
 packages/shims/src/apply-lockdown.mjs
 packages/shims/src/endoify.mjs
 packages/shims/src/eventual-send.mjs
-packages/shims/vitest.config.mts
+packages/shims/vitest.config.ts
-vitest.config.packages.mjs
+vitest.config.packages.js
+packages/test-utils/src/env/mock-endo.ts
+packages/test-utils/src/index.ts
+packages/test-utils/src/mocks.ts
+packages/test-utils/src/utils.ts