feat: 数学计算4舍5入包

.gitignore

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+.DS_Store
+node_modules
+dist
+package-lock.json*
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

mathUtil/.eslintignore

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+/dist

mathUtil/.eslintrc.js

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+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true,
+  },
+  extends: ['airbnb-base', 'plugin:@typescript-eslint/recommended', 'prettier'],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 12,
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint', 'prettier'],
+  rules: {
+    'prettier/prettier': 'error',
+    'import/extensions': [
+      'error',
+      {
+        js: 'never',
+        jsx: 'never',
+        ts: 'never',
+        tsx: 'never',
+        json: 'always',
+      },
+    ],
+    'import/no-unresolved': 'off',
+    '@typescript-eslint/no-empty-function': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    'no-unused-expressions': [
+      'error',
+      {
+        allowShortCircuit: true,
+      },
+    ],
+    'import/no-extraneous-dependencies': ['error', { devDependencies: true }],
+    'no-restricted-syntax': 'off',
+    'no-shadow': 'off',
+    '@typescript-eslint/no-shadow': 'error',
+  },
+};

mathUtil/.gitignore

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+.DS_Store
+node_modules
+dist
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

mathUtil/.huskyrc.js

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+module.exports = {
+  hooks: {
+    'pre-commit': 'lint-staged',
+    'commit-msg': 'commitlint -E HUSKY_GIT_PARAMS',
+  },
+};

mathUtil/README.md

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+### 开始
+
+统一 4 舍 5 入算法，防止浮点数计算不精确问题。
+
+### 初始化
+
+npm install
+
+### 构建
+
+npm run build
+
+### 代码风格
+
+ESLint + Airbnb config
+
+### 发布
+
+发布
+
+`npm publish`

mathUtil/commitlint.config.js

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+module.exports = {
+  ignores: [commit => commit.includes('init')],
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+    'body-leading-blank': [2, 'always'],
+    'footer-leading-blank': [1, 'always'],
+    'header-max-length': [2, 'always', 108],
+    'subject-empty': [2, 'never'],
+    'type-empty': [2, 'never'],
+    'type-enum': [
+      2,
+      'always',
+      [
+        'feat', // 新增功能、变更需求
+        'fix', // 修复bug
+        'perf', // 优化性能
+        'refactor', // 代码重构
+        'style', // 代码格式（不影响功能，例如空格、分号等格式修正）
+        'docs', // 文档变更
+        'test', // 测试
+        'ci', // 更改持续集成软件的配置文件和package中的scripts命令，例如scopes: Travis, Circle等
+        'chore', // 变更构建流程或辅助工具(依赖更新/脚手架配置修改/webpack、gulp、npm等)
+        'revert', // 代码回退
+        'types', // ts类型定义文件更改
+        'wip', // work in process开发中
+      ],
+    ],
+  },
+};

mathUtil/lint-staged.config.js

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+module.exports = {
+  '*.{js,jsx,ts,tsx}': ['eslint --fix', 'prettier --write'],
+  '{!(package)*.json,*.code-snippets,.!(browserslist)*rc}': [
+    'prettier --write--parser json',
+  ],
+  'package.json': ['prettier --write'],
+  '*.vue': ['prettier --write'],
+  '*.md': ['prettier --write'],
+};

mathUtil/package.json

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+{
+  "name": "@sc/math",
+  "version": "1.0.0",
+  "description": "4舍5入算法，防止浮点数计算不精确问题",
+  "main": "./dist/index.cjs.js",
+  "module": "./dist/index.esm.js",
+  "browser": "./dist/index.min.js",
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "test": "cross-env TS_NODE_COMPILER_OPTIONS={\\\"module\\\":\\\"commonjs\\\"} mocha -r ts-node/register 'tests/**/*.ts'",
+    "build": "rollup -c"
+  },
+  "keywords": [],
+  "author": "smartcost",
+  "license": "ISC",
+  "devDependencies": {
+    "@commitlint/cli": "^11.0.0",
+    "@commitlint/config-conventional": "^11.0.0",
+    "@types/chai": "^4.2.14",
+    "@types/mocha": "^8.0.4",
+    "@types/ms": "^0.7.31",
+    "@typescript-eslint/eslint-plugin": "^4.4.1",
+    "@typescript-eslint/parser": "^4.4.1",
+    "chai": "^4.2.0",
+    "cross-env": "^7.0.2",
+    "eslint": "^7.11.0",
+    "eslint-config-airbnb-base": "^14.2.0",
+    "eslint-config-prettier": "^6.12.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-prettier": "^3.1.4",
+    "husky": "^4.3.0",
+    "lint-staged": "^10.5.0",
+    "mocha": "^8.2.1",
+    "prettier": "^2.1.2",
+    "rollup": "^2.30.0",
+    "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-node-resolve": "^5.2.0",
+    "rollup-plugin-terser": "^7.0.2",
+    "rollup-plugin-typescript2": "^0.27.3",
+    "ts-node": "^9.0.0",
+    "tslib": "^2.0.3",
+    "typescript": "^4.0.3"
+  },
+  "dependencies": {}
+}

mathUtil/prettier.config.js

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+module.exports = {
+  singleQuote: true, // 单引号
+  trailingComma: 'es5', // 对象末尾以逗号结束
+  arrowParens: 'avoid', // 箭头函数只有一个参数的时候，不使用()
+  endOfLine: 'auto', // CRLF，LF都可以
+};

mathUtil/rollup.config.js

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+// import resolve from 'rollup-plugin-node-resolve';
+// import commonjs from 'rollup-plugin-commonjs';
+import typescript from 'rollup-plugin-typescript2'; // 一定要是typescript2，如果使用typescript，没法自动生成.d.ts文件
+// import { terser } from 'rollup-plugin-terser';
+import pkg from './package.json';
+
+export default [
+  // UMD for browser
+  /* {
+    input: 'src/index.ts',
+    output: {
+      name: 'howLongUntilLunch',
+      file: pkg.browser,
+      format: 'umd',
+    },
+    plugins: [resolve(), commonjs(), typescript(), terser()], // 浏览器使用的代码文件进行简化
+  }, */
+  // CommonJS for Node and ES module for bundlers build
+  {
+    input: 'src/index.ts',
+    external: ['ms'],
+    plugins: [typescript()],
+    output: [
+      { file: pkg.main, format: 'cjs' },
+      // { file: pkg.module, format: 'es' },
+    ],
+  },
+];

mathUtil/src/index.ts

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+/* eslint-disable no-restricted-globals */
+// 判断传入的是否是数字或者可转为数字的字符串
+export const isNumber = (value: string | number) => {
+  return /^(-|\+)?\d+(\.\d+)?$/.test(value as string);
+};
+
+export const roundForObj = (obj: string | number, decimal: number): number => {
+  let value;
+  if (obj === undefined || obj === null || isNaN(obj as number)) return 0;
+  const n = 10 ** decimal;
+  if (obj === +obj) {
+    value = Math.round(obj * n) / n;
+  } else {
+    value = Math.round(Number(obj) * n) / n;
+  }
+  return value;
+};
+
+export const roundToString = (
+  obj: string | number,
+  decimal: number
+): string => {
+  const value = roundForObj(obj, decimal);
+  return value.toFixed(decimal);
+};

mathUtil/tests/test.ts

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+import { expect } from 'chai';
+import { isNumber, roundForObj, roundToString } from '../src/index';
+
+describe('Test', () => {
+  it('test number', () => {
+    const testStr = isNumber(5);
+    expect(testStr).to.equal(true);
+  });
+
+  it('test string', () => {
+    const testStr = isNumber('6666666');
+    expect(testStr).to.equal(true);
+  });
+
+  it('test string2', () => {
+    const testStr = isNumber('ddd');
+    expect(testStr).to.equal(false);
+  });
+
+  it('to number', () => {
+    const num = roundForObj('152222.33334', 3);
+    expect(num).to.equal(152222.333);
+  });
+
+  it('to number2', () => {
+    const num = roundForObj(152222.33334, 3);
+    expect(num).to.equal(152222.333);
+  });
+
+  it('to number3', () => {
+    const num = roundForObj('ffff', 3);
+    expect(num).to.equal(0);
+  });
+
+  it('to string', () => {
+    const str = roundToString('152222.3339', 3);
+    expect(str).to.equal('152222.334');
+  });
+
+  it('to string2', () => {
+    const str = roundToString(152222.3339, 3);
+    expect(str).to.equal('152222.334');
+  });
+});

mathUtil/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "declaration": true,
+    "outDir": "./",
+    "strict": true,
+    "esModuleInterop": true,
+  },
+  "include": [
+    "src/**/*.ts",
+  ],
+  "exclude": [
+    "node_modules",
+    "test"
+  ]
+}