addSuffix method
Add a named piece of text that will be emitted at the end of the file after the main contents are generated.
The suffixKey
is not emitted - it's just used as a key for uniqueness,
so that addSuffix
could be called more than once with the same suffix
content, but only emit that particular suffix text once.
Implementation
void addSuffix(String suffixKey, String text) {
_suffixes[suffixKey] = text;
}