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.MCCommandSource;

Return Type: string

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MCCommandSource.getName() as string
myMCCommandSource.getName();

Return Type: MCPlayerEntity?

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MCCommandSource.getPlayer() as MCPlayerEntity?
myMCCommandSource.getPlayer();

Return Type: Collection<string>

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MCCommandSource.getPlayerNames() as Collection<string>
myMCCommandSource.getPlayerNames();

Return Type: Collection<string>

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MCCommandSource.getTargetedEntity() as Collection<string>
myMCCommandSource.getTargetedEntity();

Return Type: Collection<string>

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MCCommandSource.getTeamNames() as Collection<string>
myMCCommandSource.getTeamNames();

Return Type: boolean

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MCCommandSource.hasPermissionLevel(p_197034_1_ as int) as boolean

Return Type: boolean

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MCCommandSource.isPlayer() as boolean
myMCCommandSource.isPlayer();

Return Type: void

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MCCommandSource.sendErrorMessage(message as string) as void

Return Type: void

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MCCommandSource.sendFeedback(feedback as string, allowLogging as boolean) as void

Return Type: MCCommandSource

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MCCommandSource.withFeedbackDisabled() as MCCommandSource
myMCCommandSource.withFeedbackDisabled();

Return Type: MCCommandSource

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MCCommandSource.withMinPermissionLevel(p_197026_1_ as int) as MCCommandSource

Return Type: MCCommandSource

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MCCommandSource.withPermissionLevel(p_197033_1_ as int) as MCCommandSource