BREAKING: Make module ESM only

[fb55]

With the switch to exodus/bytes, we require Node 20. Let's combine this breaking change with a switch to ESM only.

[Copilot]

Pull request overview

This PR converts the module from a dual CommonJS/ESM package to ESM-only, aligning with the switch to the @exodus/bytes dependency which requires Node.js 20+. The change simplifies the build process by replacing tshy with plain TypeScript compilation.

Changes:

• Removed dual-module build system (tshy) in favor of ESM-only with standard TypeScript compiler
• Updated Node.js engine requirement to >=20.11.0
• Modernized TypeScript configuration (ES2022 target, node20 module)

Reviewed changes

Copilot reviewed 4 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Updated compiler target to ES2022, module to node20, changed output directory from "lib" to "dist", and updated exclusion patterns
package.json	Simplified exports to ESM-only, removed tshy dependency, added Node >=20.11.0 engine requirement, changed build script from tshy to tsc
package-lock.json	Removed tshy and all related dependencies (chokidar, foreground-child, resolve-import, sync-content, etc.)
sniffer.js	Removed CommonJS compatibility shim (no longer needed)
sniffer.d.ts	Removed CommonJS type definitions shim (no longer needed)
eslint.config.js	Updated Node version setting to >=20.11.0, removed obsolete ignore patterns for tshy artifacts
.prettierignore	Added dist/ and docs/ directories to ignore list
.gitignore	Removed .tshy/ directory from ignore list

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[ajaymathur]

Hey @fb55, the change LGTM. From the looks of it I believe cheerio will be able to upgrade the package version to consume the changes without any code change. Though should this cause a major upgrade in cheerio too?

Can we merge and release a version if it looks good to you too?

[ajaymathur]

Hey @fb55 , just confirming the plan is not to move https://github.com/cheeriojs/cheerio to ESM only? As that will block commonjs projects from adopting the change.
In case that is the roadmap, would be great if we can release a version before moving to ESM only. 😃