bughelp wantedtypescript
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説明
Describe the bug
Prior to v11.3 (not sure how far back, but certainly at least 10), MathNode would be narrowed based on its type property:
const doStuffWithMathNode(node: MathNode) => {
if (node.type === 'FunctionAssignmentNode) {
// now TS knows that node is a FunctionAssignmentNode and lets you access associated props
// like node.params
}
// back to being a wider MathNode
}
To Reproduce