Port object rest and spread transform#1529

Merged

weswigham merged 21 commits intomicrosoft:mainfrom

weswigham:objspread

Aug 15, 2025

Commits on Jul 15, 2025

The object spread part of object rest/spread
weswigham
committed

Commits on Jul 29, 2025

Core res downlevel ported, still need to transform function-like params with rest
weswigham
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Commits on Jul 30, 2025

Refactor flattenContext back into existence, but more go-like, small fixes
weswigham
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Commits on Aug 6, 2025

Add missing non-debug !!!s
weswigham
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Add missing ctor indirection
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Another missing binding/assignment indirection that ends up being important
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Fix sequencing and nil crashes
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We supposedly dont support es5 so the helper should be unreachable, but tests still target es5, so get it right
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Detect rest in assignment expressions correctly, fix helper field name collection to skip the actual rest element
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Fix mistaken skipInitializers flag set crash
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Lexical vs variable environment is more strictly named now, use the correct one
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Fix off by one in spread emit logic
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Fix initializers on parameters following destructured rest params
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Commits on Aug 15, 2025