josdejong/mathjs

TS regression: Narrowing of MathNodes by type

Open

#2,810 建立於 2022年10月13日

在 GitHub 查看
 (23 留言) (0 反應) (0 負責人)JavaScript (1,298 fork)batch import
bughelp wantedtypescript

倉庫指標

Star
 (13,832 star)
PR 合併指標
 (30 天內沒有已合併 PR)

描述

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

貢獻者指南