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fis-preprocessor-defines

v1.0.0

Published

A preprocessor plugin for fis2 to replace define variables.

Downloads

17

Readme

fis-preprocessor-defines

说明

fis2预编译阶段插件,用来替换代码中已定义的变量。比如针对生产、开发环境替换process.env.NODE_ENV变量,以编译压缩react、vue等前端framework。

支持常量替换正则替换

test

编写test/src.js, 执行npm test,查看test/build.js

使用


fis.config.merge({
    ...,
    modules: {
        preprocessor: {
            js: 'defines'
        }
    },
    settings: {
        preprocessor: {
            defines: {
                strings: {
                    'process.env.NODE_ENV': process.env.NODE_ENV ? JSON.stringify(process.env.NODE_ENV) : JSON.stringify("development")
                }
            }
        }
    }
});

#配置

  • 常量替换: 用来替换常量。key: value, key为要替换的常量,value为替换后的内容。
  • 正则替换: 通过自定义正则的方式替换。[{pattern: pattern, replacer: replacer}]。 pattern为正则对象,replacer为用来替换的字符串或者函数。参考:str.replace(pattern, replacer)

var config = {
  // 常量替换
  strings: {
    'process.env.NODE_ENV': JSON.stringify('production'),
    'FUN': function() {
      console.log('fun');
    },
    OBJECT: {
      a: 'a',
      b: 'b',
      c: 'c'
    },
    STR: JSON.stringify('i am comming !'),
    NULL: null,
    UNDEFINED: undefined,
    TEST: 'window.test'
  },
  // 正则替换
  regs: [
    {
      pattern: 'hello world !',
      replacer: 'HELLO WORLD !'
    },
    {
      pattern: /hello ([ABCD]) ([ABCD]) ([ABCD]) ([ABCD]) !/ig,
      replacer: function($0, $1, $2, $3, $4) {
        return 'hello ' + $1 + ' `I AM B` ' + $3 + ' ' + $4 + ' !';
      }
    }
  ]
};

注意

  • 如配置TEST, xxxx.TEST不会替换,但是TEST.xxxx会被替换。
  • 如果要将一个本身不在字符串中的字符串,替换为字符串str,值需要为JSON.stringify(str)