[compiler] Fix bug w functions depending on hoisted primitives #35284
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Fixes an edge case where a function expression would fail to take a dependency if it referenced a hoisted `const` inferred as a primitive value. We were incorrectly skipping primitve-typed operands when determing scopes for merging in InferReactiveScopeVariables. This was super tricky to debug, for posterity the trick is that Context variables (StoreContext etc) are modeled just like a mutable object, where assignment to the variable is equivalent to `object.value = ...` and reading the variable is equivalent to `object.value` property access. Comparing to an equivalent version of the repro case replaced with an object and property read/writes showed that everything was exactly right, except that InferReactiveScopeVariables wasn't merging the scopes of the function and the context variable, which led me right to the problematic line.
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Closes #35122 |
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Dec 4, 2025
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| if ( | ||
| instr.value.kind === 'FunctionExpression' || | ||
| instr.value.kind === 'ObjectMethod' | ||
| ) { | ||
| if (operand.identifier.type.kind === 'Primitive') { | ||
| continue; | ||
| } | ||
| } |
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intuitively this makes sense: we don't usually create scopes for primitives, but if we assigned a scope then it should follow all the regular merging logic of this pass
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Fixes an edge case where a function expression would fail to take a dependency if it referenced a hoisted
constinferred as a primitive value. We were incorrectly skipping primitve-typed operands when determing scopes for merging in InferReactiveScopeVariables.This was super tricky to debug, for posterity the trick is that Context variables (StoreContext etc) are modeled just like a mutable object, where assignment to the variable is equivalent to
object.value = ...and reading the variable is equivalent toobject.valueproperty access. Comparing to an equivalent version of the repro case replaced with an object and property read/writes showed that everything was exactly right, except that InferReactiveScopeVariables wasn't merging the scopes of the function and the context variable, which led me right to the problematic line.