rollup-plugin-stats/dist/index.cjs

Output Rollup stats

'use strict';

var path = require('node:path');
var process = require('node:process');
var extract = require('./extract.cjs');
var fs = require('node:fs/promises');

async function rollupStatsWrite(filepath, stats) {
    const content = JSON.stringify(stats, null, 2);
    // Create base directory if it does not exist
    await fs.mkdir(path.dirname(filepath), { recursive: true });
    await fs.writeFile(filepath, content);
    return {
        filepath,
        content,
    };
}

function round(value, precision = 2) {
    const multiplier = 10 ^ precision;
    return Math.round(value * multiplier) / multiplier;
}

const FILE_SIZE = {
    BYTE: {
        symbol: 'B',
        multiplier: 1,
    },
    KILO: {
        symbol: 'KiB',
        multiplier: 1024,
    },
    MEGA: {
        symbol: 'MiB',
        multiplier: 1024 * 1024,
    },
};
function formatFileSize(value) {
    let unit = FILE_SIZE.BYTE;
    if (typeof value !== 'number') {
        return `0${unit.symbol}`;
    }
    if (value < FILE_SIZE.KILO.multiplier) {
        unit = FILE_SIZE.BYTE;
    }
    else if (value < FILE_SIZE.MEGA.multiplier) {
        unit = FILE_SIZE.KILO;
    }
    else {
        unit = FILE_SIZE.MEGA;
    }
    return `${round(value / unit.multiplier, 2)}${unit.symbol}`;
}

const PLUGIN_NAME = 'rollupStats';
const DEFAULT_FILE_NAME = 'stats.json';
function rollupStats(options = {}) {
    return {
        name: PLUGIN_NAME,
        async generateBundle(context, bundle) {
            const resolvedOptions = typeof options === 'function' ? options(context) : options;
            const { fileName, stats: statsOptions, write = rollupStatsWrite } = resolvedOptions || {};
            const resolvedFileName = fileName || DEFAULT_FILE_NAME;
            const filepath = path.isAbsolute(resolvedFileName)
                ? resolvedFileName
                : path.join(context.dir || process.cwd(), resolvedFileName);
            const stats = extract(bundle, statsOptions);
            try {
                const res = await write(filepath, stats);
                const outputSize = Buffer.byteLength(res.content, 'utf-8');
                this.info(`Stats saved to ${res.filepath} (${formatFileSize(outputSize)})`);
            }
            catch (error) { // eslint-disable-line
                // Log error, but do not throw to allow the compilation to continue
                this.warn(error);
            }
        },
    };
}

module.exports = rollupStats;
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