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import { DataType, FunctionDefinition } from '../interfaces-private.ts';
export const stringFunctions: FunctionDefinition[] = [    {        name: 'lower',        args: [DataType.text],        returns: DataType.text,        implementation: (x: string) => x?.toLowerCase(),    },    {        name: 'upper',        args: [DataType.text],        returns: DataType.text,        implementation: (x: string) => x?.toUpperCase(),    },    {        name: 'concat',        args: [DataType.text],        argsVariadic: DataType.text,        returns: DataType.text,        allowNullArguments: true,        implementation: (...x: string[]) => x?.join(''),    },]