const SOURCE_TYPES = ['album', 'camera'] export const chooseVideo = { sourceType: { type: Array, required: false, default: SOURCE_TYPES, validator (sourceType, params) { const length = sourceType.length if (!length) { params.sourceType = SOURCE_TYPES } else { for (let i = 0; i < length; i++) { if (typeof sourceType[i] !== 'string' || !~SOURCE_TYPES.indexOf(sourceType[i])) { params.sourceType = SOURCE_TYPES break } } } } } }