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7 |
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8 | 'use strict';
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9 |
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10 | var fs = require('fs');
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11 | var path = require('path');
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12 | var chalk = require('chalk');
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13 | var filesize = require('filesize');
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14 | var recursive = require('recursive-readdir');
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15 | var stripAnsi = require('strip-ansi');
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16 | var gzipSize = require('gzip-size').sync;
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17 |
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18 | function canReadAsset(asset) {
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19 | return (
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20 | /\.(js|css)$/.test(asset) &&
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21 | !/service-worker\.js/.test(asset) &&
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22 | !/precache-manifest\.[0-9a-f]+\.js/.test(asset)
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23 | );
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24 | }
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25 |
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26 |
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27 | function printFileSizesAfterBuild(
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28 | webpackStats,
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29 | previousSizeMap,
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30 | buildFolder,
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31 | maxBundleGzipSize,
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32 | maxChunkGzipSize
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33 | ) {
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34 | var root = previousSizeMap.root;
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35 | var sizes = previousSizeMap.sizes;
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36 | var assets = (webpackStats.stats || [webpackStats])
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37 | .map(stats =>
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38 | stats
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39 | .toJson({ all: false, assets: true })
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40 | .assets.filter(asset => canReadAsset(asset.name))
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41 | .map(asset => {
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42 | var fileContents = fs.readFileSync(path.join(root, asset.name));
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43 | var size = gzipSize(fileContents);
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44 | var previousSize = sizes[removeFileNameHash(root, asset.name)];
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45 | var difference = getDifferenceLabel(size, previousSize);
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46 | return {
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47 | folder: path.join(
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48 | path.basename(buildFolder),
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49 | path.dirname(asset.name)
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50 | ),
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51 | name: path.basename(asset.name),
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52 | size: size,
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53 | sizeLabel:
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54 | filesize(size) + (difference ? ' (' + difference + ')' : ''),
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55 | };
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56 | })
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57 | )
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58 | .reduce((single, all) => all.concat(single), []);
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59 | assets.sort((a, b) => b.size - a.size);
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60 | var longestSizeLabelLength = Math.max.apply(
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61 | null,
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62 | assets.map(a => stripAnsi(a.sizeLabel).length)
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63 | );
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64 | var suggestBundleSplitting = false;
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65 | assets.forEach(asset => {
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66 | var sizeLabel = asset.sizeLabel;
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67 | var sizeLength = stripAnsi(sizeLabel).length;
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68 | if (sizeLength < longestSizeLabelLength) {
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69 | var rightPadding = ' '.repeat(longestSizeLabelLength - sizeLength);
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70 | sizeLabel += rightPadding;
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71 | }
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72 | var isMainBundle = asset.name.indexOf('main.') === 0;
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73 | var maxRecommendedSize = isMainBundle
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74 | ? maxBundleGzipSize
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75 | : maxChunkGzipSize;
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76 | var isLarge = maxRecommendedSize && asset.size > maxRecommendedSize;
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77 | if (isLarge && path.extname(asset.name) === '.js') {
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78 | suggestBundleSplitting = true;
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79 | }
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80 | console.log(
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81 | ' ' +
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82 | (isLarge ? chalk.yellow(sizeLabel) : sizeLabel) +
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83 | ' ' +
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84 | chalk.dim(asset.folder + path.sep) +
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85 | chalk.cyan(asset.name)
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86 | );
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87 | });
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88 | if (suggestBundleSplitting) {
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89 | console.log();
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90 | console.log(
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91 | chalk.yellow('The bundle size is significantly larger than recommended.')
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92 | );
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93 | console.log(
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94 | chalk.yellow(
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95 | 'Consider reducing it with code splitting: https://goo.gl/9VhYWB'
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96 | )
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97 | );
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98 | console.log(
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99 | chalk.yellow(
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100 | 'You can also analyze the project dependencies: https://goo.gl/LeUzfb'
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101 | )
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102 | );
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103 | }
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104 | }
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105 |
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106 | function removeFileNameHash(buildFolder, fileName) {
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107 | return fileName
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108 | .replace(buildFolder, '')
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109 | .replace(/\\/g, '/')
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110 | .replace(
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111 | /\/?(.*)(\.[0-9a-f]+)(\.chunk)?(\.js|\.css)/,
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112 | (match, p1, p2, p3, p4) => p1 + p4
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113 | );
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114 | }
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115 |
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116 |
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117 |
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118 | function getDifferenceLabel(currentSize, previousSize) {
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119 | var FIFTY_KILOBYTES = 1024 * 50;
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120 | var difference = currentSize - previousSize;
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121 | var fileSize = !Number.isNaN(difference) ? filesize(difference) : 0;
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122 | if (difference >= FIFTY_KILOBYTES) {
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123 | return chalk.red('+' + fileSize);
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124 | } else if (difference < FIFTY_KILOBYTES && difference > 0) {
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125 | return chalk.yellow('+' + fileSize);
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126 | } else if (difference < 0) {
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127 | return chalk.green(fileSize);
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128 | } else {
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129 | return '';
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130 | }
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131 | }
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132 |
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133 | function measureFileSizesBeforeBuild(buildFolder) {
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134 | return new Promise(resolve => {
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135 | recursive(buildFolder, (err, fileNames) => {
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136 | var sizes;
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137 | if (!err && fileNames) {
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138 | sizes = fileNames.filter(canReadAsset).reduce((memo, fileName) => {
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139 | var contents = fs.readFileSync(fileName);
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140 | var key = removeFileNameHash(buildFolder, fileName);
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141 | memo[key] = gzipSize(contents);
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142 | return memo;
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143 | }, {});
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144 | }
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145 | resolve({
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146 | root: buildFolder,
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147 | sizes: sizes || {},
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148 | });
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149 | });
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150 | });
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151 | }
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152 |
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153 | module.exports = {
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154 | measureFileSizesBeforeBuild: measureFileSizesBeforeBuild,
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155 | printFileSizesAfterBuild: printFileSizesAfterBuild,
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156 | };
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