opentf/website/docs/configuration/functions/flatten.html.md

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functions	flatten - Functions - Configuration Language	docs-funcs-collection-flatten	The flatten function eliminates nested lists from a list.

flatten Function

flatten takes a list and replaces any elements that are lists with a flattened sequence of the list contents.

Examples

> flatten([["a", "b"], [], ["c"]])
["a", "b", "c"]

If any of the nested lists also contain directly-nested lists, these too are flattened recursively:

> flatten([[["a", "b"], []], ["c"]])
["a", "b", "c"]

Indirectly-nested lists, such as those in maps, are not flattened.