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Writing to frozen/reserved data fails silently (should error in strict mode/ESM) #4341
On current main, the original _data/eleventy.js case now fails on the first build with the sourced reserved-data error added in #3536. I can still reproduce one strictness-dependent path in JavaScript data functions: assigning to the frozen data.eleventy argument is silently ignored in CJS, while the same assignment throws in ESM (both when adding a key and when overwriting generator).
For #4341, which contract would you prefer for that function argument: (1) an explicit reserved-data error in both CJS and ESM, (2) a mutable clone whose changes are local to the function, or (3) native behavior, including the CJS no-op? I’d lean toward (1), but can work with whichever behavior is intended.
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Boulea7 commentedon Aug 13, 2026
On current
main, the original_data/eleventy.jscase now fails on the first build with the sourced reserved-data error added in #3536. I can still reproduce one strictness-dependent path in JavaScript data functions: assigning to the frozendata.eleventyargument is silently ignored in CJS, while the same assignment throws in ESM (both when adding a key and when overwritinggenerator).For #4341, which contract would you prefer for that function argument: (1) an explicit reserved-data error in both CJS and ESM, (2) a mutable clone whose changes are local to the function, or (3) native behavior, including the CJS no-op? I’d lean toward (1), but can work with whichever behavior is intended.