feat: javascript helpers extension

[alandefreitas]

Fixes #881, moves us closer on #1113.

• Swapped Duktape for JerryScript across CMake, CI, presets, bootstrap recipe, and the install
  docs; added a small port layer so it all hooks up cleanly.
  • A comparison of the engines considered is available in Explore Javascript Engines #881 (comment)
• Tightened the JS helper runtime: shared context lifetime, safer value accessors, clearer errors,
  and helper registration that keeps options/hash intact for block helpers; added unit tests to cover
  the new paths.
• Added an addons-supplemental config option so you can layer extra addons/overrides; documented it and
  dropped in golden fixtures for the JS helpers. Also cleaned up the TestRunner include path.

[github-actions]

🚧 Danger.js checks for MrDocs are experimental; expect some rough edges while we tune the rules.

⚠️ Warnings

Warning

Commit 64ebd9b (feat: javascript helpers extension) changes 4016 source lines. Consider splitting it into smaller, reviewable chunks.

✨ Highlights

• 🧪 Existing golden tests changed (behavior likely shifted)

🧾 Changes by Scope

Scope	Lines Δ	Lines +	Lines -	Files Δ	Files +	Files ~	Files ↔	Files -
Source	4062	1920	2142	-4	1	6	-	11
Tests	1336	1091	245	2	-	2	-	-
Golden Tests	302	302	-	47	28	-	19	-
Third-party	271	131	140	-	3	-	-	3
CI / Roadmap	258	205	53	9	1	8	-	-
Docs	112	34	78	3	-	3	-	-
Build / Toolchain	34	20	14	3	-	3	-	-
Other	25	3	22	-	-	1	-	1
Total	6400	3706	2694	60	33	23	19	15

Legend: Files + (added), Files ~ (modified), Files ↔ (renamed), Files - (removed)

🔝 Top Files

• src/lib/Support/JavaScript.cpp (Source): 3090 lines Δ (+1430 / -1660)
• src/test/Support/JavaScript.cpp (Tests): 1333 lines Δ (+1090 / -243)
• src/lib/Gen/hbs/Builder.cpp (Source): 410 lines Δ (+236 / -174)

Generated by 🚫 dangerJS against 9783e3d

[cppalliance-bot]

An automated preview of the documentation is available at https://1126.mrdocs.prtest2.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-12-14 02:37:37 UTC