• fix(types): only return SafeString, if { htmlSafe: true } (#1431) 67442b5
• Mark htmlSafe param as optional (#1430) 5078639
• docs(README): explain @types/es-abstract error (#1427) 6aa5659
• fix: ensure empty ember-intl/translations.js is present (#1429) 11cc957
• fix(types): setupIntl test helper (#1428) 28173b4

https://github.com/ember-intl/ember-intl/compare/v5.5.0-beta.5...v5.5.0-beta.6