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import path from 'node:path';
import { gzipSync } from 'node:zlib';
export interface FileInfo {
path: string;
relativePath: string;
size: number;
gzipSize: number;
ext: string;
}
export interface SizeStatsReport {
totalFiles: number;
totalSize: number;
totalGzipSize: number;
compressionRatio: number;
files: FileInfo[];
byExtension: Record<
string,
{
count: number;
totalSize: number;
totalGzipSize: number;
avgSize: number;
avgGzipSize: number;
}
>;
}
function getGzipSize(filePath: string): number {
try {
const content = fs.readFileSync(filePath);
const compressed = gzipSync(content, { level: 9 });
return compressed.length;
} catch (error) {
return fs.statSync(filePath).size;
}
}
function getAllFiles(dirPath: string, pattern = '**/!(.*)'): string[] {
const files = globSync(pattern, {
cwd: dirPath
});
return files
.map((relativePath) => path.resolve(dirPath, relativePath))
.filter((filePath) => fs.statSync(filePath).isFile());
}
export function analyzeDirectory(
dirPath: string,
pattern?: string
): SizeStatsReport {
if (!fs.existsSync(dirPath)) {
throw new Error(`Directory does not exist: ${dirPath}`);
}
const stat = fs.statSync(dirPath);
if (!stat.isDirectory()) {
throw new Error(`Path is not a directory: ${dirPath}`);
}
const files = getAllFiles(dirPath, pattern);
const fileInfos: FileInfo[] = [];
const byExtension: Record<
string,
{
count: number;
totalSize: number;
totalGzipSize: number;
avgSize: number;
avgGzipSize: number;
}
> = {};
let totalSize = 0;
let totalGzipSize = 0;
for (const filePath of files) {
const fileStat = fs.statSync(filePath);
const size = fileStat.size;
const gzipSize = getGzipSize(filePath);
const relativePath = path.relative(process.cwd(), filePath);
const ext = path.extname(filePath).toLowerCase() || '(no ext)';
const fileInfo: FileInfo = {
path: filePath,
relativePath,
size,
gzipSize,
ext
};
fileInfos.push(fileInfo);
totalSize += size;
totalGzipSize += gzipSize;
if (!byExtension[ext]) {
byExtension[ext] = {
count: 0,
totalSize: 0,
totalGzipSize: 0,
avgSize: 0,
avgGzipSize: 0
};
}
byExtension[ext].count++;
byExtension[ext].totalSize += size;
byExtension[ext].totalGzipSize += gzipSize;
}
Object.values(byExtension).forEach((group) => {
group.avgSize = Math.round(group.totalSize / group.count);
group.avgGzipSize = Math.round(group.totalGzipSize / group.count);
});
fileInfos.sort((a, b) => b.size - a.size);
const compressionRatio =
totalSize > 0 ? ((totalSize - totalGzipSize) / totalSize) * 100 : 0;
return {
totalFiles: files.length,
totalSize,
totalGzipSize,
compressionRatio: Math.round(compressionRatio * 100) / 100,
files: fileInfos,
byExtension
};
}
export function formatSize(bytes: number): string {
const units = ['B', 'KB', 'MB', 'GB'];
let size = bytes;
let unitIndex = 0;
while (size >= 1024 && unitIndex < units.length - 1) {
size /= 1024;
unitIndex++;
}
return `${size.toFixed(unitIndex === 0 ? 0 : 1)} ${units[unitIndex]}`;
}
export function generateTextReport(report: SizeStatsReport): string {
const lines: string[] = [];
lines.push('📊 Bundle Analysis');
lines.push('='.repeat(50));
lines.push('');
const maxPathLength = Math.max(
...report.files.map((f) => f.relativePath.length)
);
const sizeHeader = 'Size'.padStart(10);
const gzippedHeader = 'Gzipped'.padStart(10);
const header = `File${' '.repeat(maxPathLength - 4)} ${sizeHeader} ${gzippedHeader}`;
lines.push(header);
lines.push('-'.repeat(header.length));
for (const file of report.files) {
const paddedPath = file.relativePath.padEnd(maxPathLength);
const sizeStr = formatSize(file.size).padStart(10);
const gzipStr = formatSize(file.gzipSize).padStart(10);
lines.push(`${paddedPath} ${sizeStr} ${gzipStr}`);
}
lines.push('');
lines.push(
`Total: ${report.totalFiles} files, ${formatSize(report.totalSize)} (gzipped: ${formatSize(report.totalGzipSize)})`
);
return lines.join('\n');
}
export function generateJsonReport(report: SizeStatsReport): string {
return JSON.stringify(report, null, 2);
}
export function generateSizeReport(dirPath: string, pattern?: string) {
const json = analyzeDirectory(dirPath, pattern);
return {
text: generateTextReport(json),
json
};
}
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