babel-plugin-ry-istanbul-web

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A Babel plugin that instruments your code with Istanbul coverage. It can instantly be used with karma-coverage and mocha on Node.js (through nyc).

Note: This plugin does not generate any report or save any data to any file; it only adds instrumenting code to your JavaScript source code. To integrate with testing tools, please see the Integrations section.

新增目录istanlibment

此目录为插桩方法，日后优化时使用，现使用原版本文件 新增方法：增量插桩两种方式 Serve packjson启动增加配置到时候不需要可以更改IS_PITCHING_PILE为false即可 "serve": "cross-env IS_PITCHING_PILE=true;cross-env INCREMENT=true;cross-env BRANCH=origin/master; vue-cli-service serve --mode dev" IS_PITCHING_PILE是否插桩 INCREMENT是否过滤增量文件 BRANCH需要对比的分支isPitchingPile为true时默认origin/master当ISPITCHINGPILE为false的时候可以不穿 第一种 [ babel-plugin-ry-istanbul, { extension: ['.js', '.vue'], instrmenttation: { IS_PITCHING_PILE: true, INCREMENT: true, BRANCH: 'origin/master' } } ] ]

新增全局传值方法

IS_PITCHING_PILE是否插桩 INCREMENT是否插桩增量代码 BRANCH需要对比的分支isPitchingPile为true时默认origin/master当ISPITCHINGPILE为false的时候可以不穿 全局配置：如.env.dev文件下增加全局变量插桩，babel-plugin-ry-istanbul同样可以取到对应值，如VUE全局变量前记得添加VUE_APP_前缀,其他则需要看使用框架是否需要添加前缀

新增parse-diff

新增parse-diff组件源码

Usage

Install it:

npm install --save-dev babel-plugin-ry-istanbul

Add it to .babelrc in test mode:

{
  "env": {
    "test": {
      "plugins": [ "istanbul" ]
    }
  }
}

Optionally, use cross-env to set NODE_ENV=test:

{
  "scripts": {
    "test": "cross-env NODE_ENV=test nyc --reporter=lcov --reporter=text mocha test/*.js"
  }
}

Integrations

karma

It just works with Karma. First, make sure that the code is already transpiled by Babel (either using karma-babel-preprocessor, karma-webpack, or karma-browserify). Then, simply set up karma-coverage according to the docs, but don’t add the coverage preprocessor. This plugin has already instrumented your code, and Karma should pick it up automatically.

It has been tested with bemusic/bemuse project, which contains ~2400 statements.

mocha on node.js (through nyc)

Configure Mocha to transpile JavaScript code using Babel, then you can run your tests with nyc, which will collect all the coverage report.

babel-plugin-ry-istanbul respects the include/exclude configuration options from nyc, but you also need to configure NYC not to instrument your code by adding these settings in your package.json:

  "nyc": {
    "sourceMap": false,
    "instrument": false
  },

Ignoring files

You don't want to cover your test files as this will skew your coverage results. You can configure this by providing plugin options matching nyc's exclude/include rules:

{
  "env": {
    "test": {
      "plugins": [
        ["istanbul", {
          "exclude": [
            "**/*.spec.js"
          ]
        }]
      ]
    }
  }
}

If you don't provide options in your Babel config, the plugin will look for exclude/include config under an "nyc" key in package.json.

You can also use istanbul's ignore hints to specify specific lines of code to skip instrumenting.

Source Maps

By default, this plugin will pick up inline source maps and attach them to the instrumented code such that code coverage can be remapped back to the original source, even for multi-step build processes. This can be memory intensive. Set useInlineSourceMaps to prevent this behavior.

{
  "env": {
    "test": {
      "plugins": [
        ["istanbul", {
          "useInlineSourceMaps": false
        }]
      ]
    }
  }
}

If you're instrumenting code programatically, you can pass a source map explicitly.

import babelPluginIstanbul from 'babel-plugin-ry-istanbul';

function instrument(sourceCode, sourceMap, fileName) {
  return babel.transform(sourceCode, {
    filename,
    plugins: [
      [babelPluginIstanbul, {
        inputSourceMap: sourceMap
      }]
    ]
  })
}

Credit where credit is due

The approach used in babel-plugin-ry-istanbul was inspired by Thai Pangsakulyanont's original library babel-plugin-__coverage__.

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