TSExternalModuleReference(node) {
      const requireToken = tokenStore.getFirstToken(node)
      const leftParenToken = tokenStore.getTokenAfter(
        requireToken,
        isOpeningParenToken
      )
      const rightParenToken = tokenStore.getLastToken(node)
      setOffset(leftParenToken, 1, requireToken)
      processNodeList([node.expression], leftParenToken, rightParenToken, 1)
    }
Process external module reference

e.g.
```
import foo = require('foo')
//           ^^^^^^^^^^^^^^
```