JavaScript 中一般习惯使用驼峰的格式写变量名，但难保证各种接口返回的是什么格式，通常看后端语言决定，所以可以在返回后统一一下。

1. 完成功能

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// 详见：repo
import Convertor from './Convertor';

export default class Mapper {
  private obj: Obj;

  constructor(obj: Obj) {
    this.obj = obj
  }

  toCamelcase = (currentVal = this.obj): Obj => {
    // ...
  };

  toSnakecase = (currentVal = this.obj): Obj => {
    // ...
  };
}

2. 测试

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import { toCamelcase, toSnakecase } from '../src';

describe('Main', () => {
  const data = {
    key_of_map: 1,
    'key_the-map': {
      key_ofmap: 2,
      key_for_map: {
        ' key -_nested': {
          'key deep': {
            'key deeper_': 'end',
            b2b_Category: 'b2b',
          },
        },
      },
    },
  };

  test('Main.toCamelCase', () => {
    expect(toCamelcase(data)).toEqual({
      keyOfMap: 1,
      keyTheMap: {
        keyOfmap: 2,
        keyForMap: {
          keyNested: {
            keyDeep: {
              keyDeeper: 'end',
              b2bCategory: 'b2b',
            },
          },
        },
      },
    });
  });

  test('Main.toSnakecase', () => {
    expect(toSnakecase(data)).toEqual({ /* ... */ });
  });
});

3. 编译

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{
  "scripts": {
    "build": "tsc",
    "type-check": "tsc --noEmit",
    "type-check:watch": "npm run type-check -- --watch",
    "prepare": "npm run build",
    "test": "jest --watchAll"
  },
}

4. 发布

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npm login
npm publish