TS2448 Block-scoped variable used before its declaration

[jfirebaugh]

Steps to reproduce

export function foo() {
  const _fn = () => {
    ;(() => numFilesSelected)()
  }

  const numFilesSelected = 1
}

Behavior with typescript@5.9

No error.

Behavior with tsgo

test.tsx:3:13 - error TS2448: Block-scoped variable 'numFilesSelected' used before its declaration.

3     ;(() => numFilesSelected)()
              ~~~~~~~~~~~~~~~~

  test.tsx:6:9 - 'numFilesSelected' is declared here.
    6   const numFilesSelected = 1
              ~~~~~~~~~~~~~~~~

[jfirebaugh]

This regressed somewhere between 7.0.0-dev.20250818.1 and 7.0.0-dev.20251010.1.

[jakebailey]

Bisects to #1829.