It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

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import crafttweaker.api.commands.custom.CustomCommands;

Return Type: MCRequiredArgumentBuilder

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CustomCommands.argument(name as string) as MCRequiredArgumentBuilder

Return Type: MCLiteralArgumentBuilder

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CustomCommands.literal(name as string) as MCLiteralArgumentBuilder

Return Type: void

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CustomCommands.registerCommand(builder as MCLiteralArgumentBuilder) as void