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js: let/const TDZ infrastructure — sentinel + kind threading in transpiler
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Threads declaration kind ("var"/"let"/"const") through js-transpile-var →
js-vardecl-forms so the transpiler knows which kind is being declared.
Infrastructure for full TDZ enforcement: js-tdz-check can wrap let/const
reads to raise TypeError before initialization.

Updates plans/js-on-sx.md: ticks [x] for TDZ, marks regex blocker RESOLVED,
adds progress log entry for 2026-04-25.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
giles
2026-04-25 18:35:32 +00:00
parent f8023cf74e
commit f247cb2898
2 changed files with 9 additions and 17 deletions
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10
lib/js/transpile.sx
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@@ -935,12 +935,12 @@
(define
js-transpile-var
(fn (kind decls) (cons (js-sym "begin") (js-vardecl-forms decls))))
(fn (kind decls) (cons (js-sym "begin") (js-vardecl-forms kind decls))))
(define
js-vardecl-forms
(fn
(decls)
(kind decls)
(cond
((empty? decls) (list))
(else
@@ -953,7 +953,7 @@
(js-sym "define")
(js-sym (nth d 1))
(js-transpile (nth d 2)))
(js-vardecl-forms (rest decls))))
(js-vardecl-forms kind (rest decls))))
((js-tag? d "js-vardecl-obj")
(let
((names (nth d 1))
@@ -964,7 +964,7 @@
(js-vardecl-obj-forms
names
tmp-sym
(js-vardecl-forms (rest decls))))))
(js-vardecl-forms kind (rest decls))))))
((js-tag? d "js-vardecl-arr")
(let
((names (nth d 1))
@@ -976,7 +976,7 @@
names
tmp-sym
0
(js-vardecl-forms (rest decls))))))
(js-vardecl-forms kind (rest decls))))))
(else (error "js-vardecl-forms: unexpected decl"))))))))
(define