analyzer.js
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const fs = require('fs');
const path = require('path');
const _ = require('lodash');
const gzipSize = require('gzip-size');
const Logger = require('./Logger');
const { Folder } = require('../lib/tree');
const { parseBundle } = require('../lib/parseUtils');
const FILENAME_QUERY_REGEXP = /\?.*$/;
module.exports = {
getViewerData,
readStatsFromFile
};
function getViewerData(bundleStats, bundleDir, opts) {
const {
logger = new Logger()
} = opts || {};
// Sometimes all the information is located in `children` array (e.g. problem in #10)
if (_.isEmpty(bundleStats.assets) && !_.isEmpty(bundleStats.children)) {
bundleStats = bundleStats.children[0];
}
// Picking only `*.js` assets from bundle that has non-empty `chunks` array
bundleStats.assets = _.filter(bundleStats.assets, asset => {
// Removing query part from filename (yes, somebody uses it for some reason and Webpack supports it)
// See #22
asset.name = asset.name.replace(FILENAME_QUERY_REGEXP, '');
return _.endsWith(asset.name, '.js') && !_.isEmpty(asset.chunks);
});
// Trying to parse bundle assets and get real module sizes if `bundleDir` is provided
let parsedModuleSizes = null;
let bundlesSources = {};
let parsedModules = {};
if (bundleDir) {
for (const statAsset of bundleStats.assets) {
const assetFile = path.join(bundleDir, statAsset.name);
let bundleInfo;
try {
bundleInfo = parseBundle(assetFile);
} catch (err) {
bundleInfo = null;
}
if (bundleInfo) {
bundlesSources[statAsset.name] = bundleInfo.src;
_.assign(parsedModules, bundleInfo.modules);
} else {
logger.warn(
`\nCouldn't parse bundle asset "${assetFile}".\n` +
'Analyzer will use module sizes from stats file.\n'
);
parsedModules = null;
bundlesSources = null;
break;
}
}
if (parsedModules) {
parsedModuleSizes = _.mapValues(parsedModules,
moduleSrc => ({
raw: moduleSrc.length,
gzip: gzipSize.sync(moduleSrc)
})
);
}
}
const assets = _.transform(bundleStats.assets, (result, statAsset) => {
const asset = result[statAsset.name] = _.pick(statAsset, 'size');
if (bundlesSources) {
asset.parsedSize = bundlesSources[statAsset.name].length;
asset.gzipSize = gzipSize.sync(bundlesSources[statAsset.name]);
}
// Picking modules from current bundle script
asset.modules = _(bundleStats.modules)
.filter(statModule => assetHasModule(statAsset, statModule))
.each(statModule => {
if (parsedModuleSizes) {
statModule.parsedSize = parsedModuleSizes[statModule.id].raw;
statModule.gzipSize = parsedModuleSizes[statModule.id].gzip;
}
});
asset.tree = createModulesTree(asset.modules);
}, {});
return _.transform(assets, (result, asset, filename) => {
result.push({
label: filename,
// Not using `asset.size` here provided by Webpack because it can be very confusing when `UglifyJsPlugin` is used.
// In this case all module sizes from stats file will represent unminified module sizes, but `asset.size` will
// be the size of minified bundle.
statSize: asset.tree.size,
parsedSize: asset.parsedSize,
gzipSize: asset.gzipSize,
groups: _.invokeMap(asset.tree.children, 'toChartData')
});
}, []);
}
function readStatsFromFile(filename) {
return JSON.parse(
fs.readFileSync(filename, 'utf8')
);
}
function assetHasModule(statAsset, statModule) {
return _.some(statModule.chunks, moduleChunk =>
_.includes(statAsset.chunks, moduleChunk)
);
}
function createModulesTree(modules) {
const root = new Folder('.');
_.each(modules, module => {
const path = getModulePath(module.name);
if (path) {
root.addModuleByPath(path, module);
}
});
return root;
}
function getModulePath(path) {
const parsedPath = _
// Removing loaders from module path: they're joined by `!` and the last part is a raw module path
.last(path.split('!'))
// Splitting module path into parts
.split('/')
// Removing first `.`
.slice(1)
// Replacing `~` with `node_modules`
.map(part => (part === '~') ? 'node_modules' : part);
return parsedPath.length ? parsedPath : null;
}