Support reading large stats.json files (webpack#423)

* Remake PR

* Move from devDependencies

Author: henry-alakazhang

CHANGELOG.md

@@ -12,6 +12,9 @@ _Note: Gaps between patch versions are faulty, broken or test releases._
 
 ## UNRELEASED
 
+ * **Improvement**
+   * Support reading large (>500MB) stats.json files ([#423](https://github.com/webpack-contrib/webpack-bundle-analyzer/pull/423) by [@henry-alakazhang](https://github.com/henry-alakazhang))
+
 ## 4.7.0
 
  * **New Feature**

package-lock.json

@@ -32,6 +32,7 @@
     "lib"
   ],
   "dependencies": {
+    "@discoveryjs/json-ext": "0.5.7",
     "acorn": "^8.0.4",
     "acorn-walk": "^8.0.0",
     "chalk": "^4.1.0",

package.json

@@ -3,6 +3,7 @@ const path = require('path');
 
 const _ = require('lodash');
 const gzipSize = require('gzip-size');
+const {parseChunked} = require('@discoveryjs/json-ext');
 
 const Logger = require('./Logger');
 const Folder = require('./tree/Folder').default;
@@ -164,8 +165,8 @@ function getViewerData(bundleStats, bundleDir, opts) {
 }
 
 function readStatsFromFile(filename) {
-  return JSON.parse(
-    fs.readFileSync(filename, 'utf8')
+  return parseChunked(
+    fs.createReadStream(filename, {encoding: 'utf8'})
   );
 }
 

src/analyzer.js

@@ -110,44 +110,46 @@ bundleStatsFile = resolve(bundleStatsFile);
 
 if (!bundleDir) bundleDir = dirname(bundleStatsFile);
 
-let bundleStats;
-try {
-  bundleStats = analyzer.readStatsFromFile(bundleStatsFile);
-} catch (err) {
-  logger.error(`Couldn't read webpack bundle stats from "${bundleStatsFile}":\n${err}`);
-  logger.debug(err.stack);
-  process.exit(1);
-}
-
-if (mode === 'server') {
-  viewer.startServer(bundleStats, {
-    openBrowser,
-    port,
-    host,
-    defaultSizes,
-    reportTitle,
-    bundleDir,
-    excludeAssets,
-    logger: new Logger(logLevel),
-    analyzerUrl: utils.defaultAnalyzerUrl
-  });
-} else if (mode === 'static') {
-  viewer.generateReport(bundleStats, {
-    openBrowser,
-    reportFilename: resolve(reportFilename || 'report.html'),
-    reportTitle,
-    defaultSizes,
-    bundleDir,
-    excludeAssets,
-    logger: new Logger(logLevel)
-  });
-} else if (mode === 'json') {
-  viewer.generateJSONReport(bundleStats, {
-    reportFilename: resolve(reportFilename || 'report.json'),
-    bundleDir,
-    excludeAssets,
-    logger: new Logger(logLevel)
-  });
+parseAndAnalyse(bundleStatsFile);
+
+async function parseAndAnalyse(bundleStatsFile) {
+  try {
+    const bundleStats = await analyzer.readStatsFromFile(bundleStatsFile);
+    if (mode === 'server') {
+      viewer.startServer(bundleStats, {
+        openBrowser,
+        port,
+        host,
+        defaultSizes,
+        reportTitle,
+        bundleDir,
+        excludeAssets,
+        logger: new Logger(logLevel),
+        analyzerUrl: utils.defaultAnalyzerUrl
+      });
+    } else if (mode === 'static') {
+      viewer.generateReport(bundleStats, {
+        openBrowser,
+        reportFilename: resolve(reportFilename || 'report.html'),
+        reportTitle,
+        defaultSizes,
+        bundleDir,
+        excludeAssets,
+        logger: new Logger(logLevel)
+      });
+    } else if (mode === 'json') {
+      viewer.generateJSONReport(bundleStats, {
+        reportFilename: resolve(reportFilename || 'report.json'),
+        bundleDir,
+        excludeAssets,
+        logger: new Logger(logLevel)
+      });
+    }
+  } catch (err) {
+    logger.error(`Couldn't read webpack bundle stats from "${bundleStatsFile}":\n${err}`);
+    logger.debug(err.stack);
+    process.exit(1);
+  }
 }
 
 function showHelp(error) {