gulp构建小程序的方法步骤

 更新时间:2019年05月31日 11:14:57   转载 作者:Ryan  
这篇文章主要介绍了gulp构建小程序的方法步骤,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

目前来说,对于构建小程序的,类似taro这些框架,生态已经挺完善的了,没有什么必要再搞一套来折腾自己。但是,我司的小程序,是很早之前就开发的,我们负责人当时信不过这些开源的框架,于是自己用webpack搞了一套框架,但有一个比较严重的问题,有一些文件依赖重复打包了,导致小程序包体积比较大。

持续了一个多月,主包体积在2M左右徘徊,开发都很难做下去。我们负责人终于受不了了,给了我个任务,让我写一个构建小程序的工具,减少小程序包体积。

我们现在的框架对比一下原生小程序,其实差别不大,无非就是

 ts => js
sass=>wxss
wxml=>wxml
json=>json

由于我司小程序基础库是1.9.8的,不支持构建npm,所以node_modules的依赖包以及依赖路径需要自己处理,于是写了一个babel插件 babel-plugin-copy-npm。
这么一想,其实不难,而且单文件编译,那不是gulp的强项吗!!!

最终效果:

而且由于增量更新,只修改改变的文件,所以编译的速度非常快。

项目地址:https://github.com/m-Ryan/ry-wx

最终流程大概如下:清除dist目录下的文件 => 编译文件到dist目录下=> 开发模式监听文件更改,生产环境压缩文件。

一、清除dist目录下的文件 (clean.js)

const del = require('del');
const fs = require('fs');
const path = require('path');
const cwd = process.cwd();
module.exports = function clean() {
  if (!fs.existsSync(path.join(cwd, 'dist'))) {
    fs.mkdirSync('dist');
    return Promise.resolve(null);
  }
  return del([ '*', '!npm' ], {
    force: true,
    cwd: path.join(cwd, 'dist')
  });
};

二、编译文件

1.编译typescript(compileJs.js)

const gulp = require('gulp');
const { babel } = require('gulp-load-plugins')();
const path = require('path');
const cwd = process.cwd();
module.exports = function compileJs(filePath) {
  let file = 'src/**/*.ts';
  let dist = 'dist';
  if (typeof filePath === 'string') {
    file = path.join(cwd, filePath);
    dist = path.dirname(file.replace(/src/, 'dist'));
  }
  return gulp.src(file).pipe(babel()).pipe(gulp.dest(dist));
};

2.编译sass(compileSass.js)

const gulp = require('gulp');
const { sass, postcss, rename } = require('gulp-load-plugins')();
const path = require('path');
const cwd = process.cwd();
const plugins = [
  require('autoprefixer')({
    browsers: [ 'ios >= 8', 'ChromeAndroid >= 53' ],
    remove: false,
    add: true
  }),
  require('postcss-pxtorpx')({
    multiplier: 2,
    propList: [ '*' ]
  })
];

module.exports = function compileSass(filePath) {
  let file = 'src/**/*.scss';
  let dist = 'dist';
  if (typeof filePath === 'string') {
    file = path.join(cwd, filePath);
    dist = path.dirname(file.replace(/src/, 'dist'));
  }
  return gulp
    .src(file)
    .pipe(sass({ outputStyle: 'compressed' }).on('error', sass.logError))
    .pipe(postcss(plugins))
    .pipe(
      rename({
        extname: '.wxss'
      })
    )
    .pipe(gulp.dest(dist));
};

编译json,wxml,由于需要压缩,所以需要分开处理

(copyJson.js)

const gulp = require('gulp');

module.exports = function copyJson() {
  let file = 'src/**/*.json';
  let dist = 'dist';
  if (typeof filePath === 'string') {
    file = path.join(cwd, filePath);
    dist = path.dirname(file.replace(/src/, 'dist'));
  }
  return gulp.src([ file ]).pipe(gulp.dest(dist));
};

(copyWxml.js)

const gulp = require('gulp');

const minifyHtml = require('gulp-html-minify');
module.exports = function copyWxmlFiles() {
  let file = 'src/**/*.wxml';
  let dist = 'dist';
  if (typeof filePath === 'string') {
    file = path.join(cwd, filePath);
    dist = path.dirname(file.replace(/src/, 'dist'));
  }
  return gulp.src(file).pipe(minifyHtml()).pipe(gulp.dest(dist));
};

4.拷贝其他静态资源,例如字体、图片

(copyAssets.js)

const gulp = require("gulp");

module.exports = function copyAssets() {
 let file = "src/**/**";
 let dist = "dist";
 if (typeof filePath === "string") {
  file = path.join(cwd, filePath);
  dist = path.dirname(file.replace(/src/, "dist"));
 }
 return gulp
  .src([
   file,
   "!**/*.json",
   "!**/*.ts",
   "!**/*.js",
   "!**/*.scss",
   "!**/*.wxml"
  ])
  .pipe(gulp.dest(dist));
};

5.引入文件(gulpfile.js)

const gulp = require("gulp");
const clean = require("./build/clean");
const compileJs = require("./build/compileJs");
const compileSass = require("./build/compileSass");
const copyJson = require("./build/copyJson");
const copyWxml = require("./build/copyWxml");
const copyAssets = require("./build/copyAssets");
const fs = require("fs-extra");
const path = require("path");
const chalk = require("chalk");
const cwd = process.cwd();
const dayjs = require("dayjs");

const tasks = [
 clean,
 gulp.parallel([compileJs, compileSass, copyJson, copyWxml]),
 copyAssets
];
if (process.env.NODE_ENV === "development") {
 tasks.push(watch);
}

gulp.task("default", gulp.series(tasks));

gulp.task("watch", watch);
function watch() {
 console.log(chalk.blue(`正在监听文件... ${getNow()}`));
 const watcher = gulp.watch("src/**/**");

 watcher.on("change", function(filePath, stats) {
  compile(filePath);
 });

 watcher.on("add", function(filePath, stats) {
  compile(filePath);
 });

 watcher.on("unlink", function(filePath, stats) {
  let distFile = filePath.replace(/^src\b/, "dist");
  let absolutePath = "";
  if (distFile.endsWith(".ts")) {
   distFile = distFile.replace(/.ts$/, ".js");
  } else if (distFile.endsWith(".scss")) {
   distFile = distFile.replace(/.scss$/, ".wxss");
  }
  absolutePath = path.join(cwd, distFile);
  if (fs.existsSync(absolutePath)) {
   fs.unlinkSync(absolutePath);
   console.log(
    chalk.yellow(`删除文件:${path.basename(distFile)} ${getNow()}`)
   );
  }
 });
}

function compile(filePath) {
 console.info(
  chalk.green(`编译完成:${path.basename(filePath)} ${getNow()}`)
 );
 if (filePath.endsWith(".ts")) {
  compileJs(filePath);
 } else if (filePath.endsWith(".scss")) {
  compileSass(filePath);
 } else if (filePath.endsWith(".wxml")) {
  copyWxml(filePath);
 } else if (filePath.endsWith(".json")) {
  copyJson(filePath);
 } else {
  copyAssets(filePath);
 }
}

function getNow() {
 return dayjs().format("HH:mm:ss");
}

babel的配置如下.babelrc.js

const babelOptions = {
  presets: [ '@babel/preset-typescript', [ '@babel/env' ] ],
  plugins: [
    'lodash',
    [
      '@babel/plugin-proposal-decorators',
      {
        legacy: true
      }
    ],
    'babel-plugin-add-module-exports',
    [
      '@babel/plugin-transform-runtime',
      {
        corejs: false,
        helpers: true,
        regenerator: true,
        useESModules: false
      }
    ],

    [
      'module-resolver',
      {
        root: [ '.' ],
        alias: {
          '@': './src'
        }
      }
    ],
    [
      'babel-plugin-copy-npm',
      {
        rootDir: 'src',
        outputDir: 'dist',
        npmDir: 'npm',
        format: 'cjs',
        strict: false,
        minify: true,
        loose: true,
        cache: true
      }
    ]
  ]
};

if (process.env.NODE_ENV === 'production') {
  babelOptions.presets.unshift([
    'minify',
    {
      mangle: {
        exclude: [ 'wx', 'module', 'exports', '__wxConfigx', 'process', 'global' ]
      },
      keepFnName: true
    }
  ]);
}

module.exports = babelOptions;

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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