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#include config of backendlayout
-- BackendLayouts/
|-- default.ts
|-- default1.ts
|-- default2.ts
|-- default3.ts
|-- default4.ts
|-- default5.ts
|-- ...
### include all folder tses extensions="ts"
<INCLUDE_TYPOSCRIPT: source="DIR:EXT:custom_template/Configuration/TypoScript/PageTSconfig/BackendLayouts" extensions="ts">
### old way to include default.ts
<INCLUDE_TYPOSCRIPT: source="FILE:EXT:custom_template/Configuration/TypoScript/PageTSconfig/BackendLayouts/default.ts">
<INCLUDE_TYPOSCRIPT: source="FILE:EXT:custom_template/Configuration/TypoScript/PageTSconfig/BackendLayouts/default1.ts">
...
<INCLUDE_TYPOSCRIPT: source="FILE:EXT:custom_template/Configuration/TypoScript/PageTSconfig/BackendLayouts/defaultn.ts">