functionHeader not support {}

[kstan79]

Describe the bug
I'm using eta to generate generate some typescript code. when it read variable it will call specific typescript function via functionHeader. So far it work well until I need to define function/if/else cause it content symbol "{}" as below. I addedm ''mbefore the result same.
EtaError [Eta Error]: Bad template syntax

To Reproduce
Steps to reproduce the behavior:

1. Type in 'functionHeader consist of {/}'
2. Call function 'functionHeader'
3. Look at result in 'console'

Expected behavior
by right it shall execute correctly and complete update template.

Screenshots
Below screenshoot demonstrate generate failed

Package & Environment Details
node v20.9.0
OS: MacOS

[nebrelbug]

Try adding a newline between each function you declare.