getExpressionOrThrow no longer exists on JsxElement in v16

[oshi97]

Describe the bug

Version: 16.0.0

To Reproduce

getExpressionOrThrow no longer exists on JsxElement in v16. This doesn't appear to be present in the release notes for the 16.0.0 breaking changes

import { SyntaxKind, JsxAttribute } from 'ts-morph'

function doJsxThing(n: JsxAttribute) {
  const initializer = n.getInitializerOrThrow()
  if (initializer.isKind(SyntaxKind.StringLiteral)) {
    return
  }
  // no longer compiles
  const expression = initializer.getExpressionOrThrow()
}

Expected behavior

I think the code should compile if this isn't an expected change. Otherwise would appreciate an alternative!

[dsherret]

There are too many changes in TS 4.8 for me to document in the release notes as I don't have time, so I just say "upgraded to TS 4.8" as a breaking change.

Previously JsxAttribute#getInitializerOrThrow() returned StringLiteral | JsxExpression. In TS 4.8, they updated that to be StringLiteral | JsxExpression | JsxElement | JsxSelfClosingElement | JsxFragment:

https://github.com/dsherret/ts-morph/pull/1316/files#diff-1689901fc8d46451616bd34e0e34bf5c359401decc33ecd5fa7065f30525af6aR1403

So, the issue occurs because the jsx attribute initializer could be more things than possibly a StringLiteral | JsxExpression now. You will have to add extra checks for those other syntax kinds.

[oshi97]

Thank you!