src/generators/Generator.js/Generator/getUniqueNameMaker
class Generator:	getUniqueNameMaker ( params ) {
		const localUsedNames = new Set( params );
		return name => {
			if ( test ) name = `${name}$`;
			let alias = name;
			for ( let i = 1; reservedNames.has( alias ) || this.importedNames.has( alias ) || this._usedNames.has( alias ) || localUsedNames.has( alias ); alias = `${name}_${i++}` );
			localUsedNames.add( alias );
			return alias;
		};
	}