Convert to ESM

[kibertoad]

No description provided.

[kibertoad]

@jaylinski pls review!

[Copilot]

Pull request overview

This PR converts the package’s build/test setup to publish and consume a single ESM build output (dist/index.js) and updates the toolchain configuration accordingly.

Changes:

• Update TypeScript and ESLint targets to ES2022 and emit ES2022 modules into dist/.
• Simplify package.json exports to a single default ESM entry and remove the CJS build pipeline.
• Update specs to import from ../dist/index.js and drop Node 18 from CI/engines.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.json	Moves compilation target/module to ES2022 and emits into dist/.
package.json	Switches to a single ESM export/build output; adjusts build scripts, engines, and published files.
spec/visitor.js	Updates test import path to new dist entry.
spec/utils.js	Updates test import path to new dist entry.
spec/parser.js	Updates test import path to new dist entry.
spec/ast.js	Updates test import path to new dist entry.
.github/workflows/ci.yml	Removes Node 18 from the test matrix.
.eslintrc.cjs	Updates ESLint ecmaVersion to 2022.

Comments suppressed due to low confidence (1)

.github/workflows/ci.yml:48

• The matrix key is spelled node-vesion. While it currently works because it’s referenced consistently, the typo makes the workflow harder to understand and easier to mis-edit later. Rename the key to node-version and update the ${{ matrix.* }} reference accordingly.

    strategy:
      matrix:
        node-vesion:
          - 20
          - 22
          - 24

    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
      - uses: actions/setup-node@v4
        with: 
          cache: pnpm
          node-version: ${{matrix.node-vesion}}

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