chore: migrate to bun (phase 1)

[nicomiguelino]

Summary

• Switch Docker image, CI workflows, and dev scripts from npm to bun.
• Replace package-lock.json with bun.lock.
• Fix jsdom opaque origin error and scss mock loading under Bun's module resolver.

This is phase 1 of a multi phase migration. Later phases will be stacked on top.

Test plan

• docker compose build succeeds
• bunx webpack --config webpack.prod.js produces a valid dist/ (manifest.json, popup.bundle.js, popup.html)
• bun run test passes all 29 specs
• bun run lint:check and bun run format:check pass on src/

[Copilot]

Pull request overview

Phase 1 of migrating the project’s dev/build/test toolchain from npm/node base images to Bun, updating Docker + CI execution paths and adjusting the test environment to behave correctly under Bun (notably JSDOM origin handling and CSS/SCSS import mocking).

Changes:

• Switch container base image and container-invoked commands from npm/npx to bun/bunx (Dockerfile, workflows, and helper scripts).
• Add JSDOM url configuration to avoid “opaque origin” issues (enables localStorage/sessionStorage access in tests).
• Replace Node-only CSS/SCSS require hooks with a Bun-aware plugin, while preserving Node compatibility.

Reviewed changes

Copilot reviewed 7 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/test/environment.js	Sets a concrete JSDOM URL to prevent opaque-origin failures in the test environment.
spec/helpers/mock-styles.js	Adds a Bun plugin to mock .css/.scss loads under Bun, with a Node fallback using require.extensions.
spec/helpers/jsdom.js	Updates JSDOM initialization to include a URL for consistent origin behavior.
Dockerfile	Migrates the build image from node:22 to oven/bun:1.4.0 and installs deps via bun install using bun.lock.
docker-compose.yml	Runs the dev webpack watcher via bunx instead of npx.
bin/run_tests.sh	Runs tests via bun run test inside the container.
bin/run_formatter.sh	Runs formatting via bun run format:* inside the container.
bin/run_eslint.sh	Runs lint checks via bun run lint:check inside the container.
bin/package_extension.sh	Builds the production bundle via bunx webpack inside the container.
.github/workflows/test.yaml	Updates CI test job to use bunx + bun run test in the container.
.github/workflows/build.yaml	Updates CI build job to use bun run build in the container.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 14 changed files in this pull request and generated 1 comment.

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

Dockerfile:10

• bun install in the Docker build is not using a frozen/locked mode. That means a Docker/CI build can silently resolve different dependency versions than what bun.lock specifies (or even rewrite the lockfile), reducing reproducibility. Consider using bun install --frozen-lockfile for image builds.

ADD package.json /app/package.json
ADD bun.lock /app/bun.lock
RUN bun install