src/vs/platform/configuration/common/configurationRegistry.ts/getDefaultValue
export function getDefaultValue(type: string | string[] | undefined): any {
	const t = Array.isArray(type) ? (<string[]>type)[0] : <string>type;
	switch (t) {
		case 'boolean':
			return false;
		case 'integer':
		case 'number':
			return 0;
		case 'string':
			return '';
		case 'array':
			return [];
		case 'object':
			return {};
		default:
			return null;
	}
}