Returns [code]true[/code] if the build is a debug build.
Returns [code]true[/code] when running in the editor.
Returns [code]false[/code] if the build is a release build.
Returns [code]true[/code] if the Godot binary used to run the project is a [i]debug[/i] export template, or when running in the editor.
Returns [code]false[/code] if the Godot binary used to run the project is a [i]release[/i] export template.
To check whether the Godot binary used to run the project is an export template (debug or release), use [code]OS.has_feature("standalone")[/code] instead.