安装了包lodash.snakecase, 也安装了definition @types/lodash.snakecase，然后import提示：

resolves to a non-module entity and cannot be imported using this construct. [2497]

试了下：

import * as snakeCase from 'lodash.snakecase';

或者

import snakeCase from 'lodash.snakecase';

结果都不行，最后用这种可以了：

import snakeCase = require('lodash.snakecase');