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utils.js
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utils.js
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import fs from 'fs';
import prettyBytes from 'pretty-bytes';
/**
* Check if a given file exists and can be accessed.
* @param {string} filename
*/
export async function fileExists(filename) {
try {
await fs.promises.access(filename, fs.constants.F_OK);
return true;
} catch (e) {}
return false;
}
/**
* Remove any matched hash patterns from a filename string.
* @param {string=} regex
* @returns {(((fileName: string) => string) | undefined)}
*/
export function stripHash(regex) {
if (regex) {
console.log(`Stripping hash from build chunks using '${regex}' pattern.`);
return function (fileName) {
return fileName.replace(new RegExp(regex), (str, ...hashes) => {
hashes = hashes.slice(0, -2).filter((c) => c != null);
if (hashes.length) {
for (let i = 0; i < hashes.length; i++) {
const hash = hashes[i] || '';
str = str.replace(hash, hash.replace(/./g, '*'));
}
return str;
}
return '';
});
};
}
return undefined;
}
/**
* @param {number} delta
* @param {number} originalSize
*/
export function getDeltaText(delta, originalSize) {
let deltaText = (delta > 0 ? '+' : '') + prettyBytes(delta);
if (Math.abs(delta) === 0) {
// only print size
} else if (originalSize === 0) {
deltaText += ` (new file)`;
} else if (originalSize === -delta) {
deltaText += ` (removed)`;
} else {
const percentage = Number(((delta / originalSize) * 100).toFixed(2));
deltaText += ` (${percentage > 0 ? '+' : ''}${percentage}%)`;
}
return deltaText;
}
/**
* @param {number} delta
* @param {number} originalSize
*/
export function iconForDifference(delta, originalSize) {
if (originalSize === 0) return '🆕';
const percentage = Math.round((delta / originalSize) * 100);
if (percentage >= 50) return '🆘';
else if (percentage >= 20) return '🚨';
else if (percentage >= 10) return '⚠️';
else if (percentage >= 5) return '🔍';
else if (percentage <= -50) return '🏆';
else if (percentage <= -20) return '🎉';
else if (percentage <= -10) return '👏';
else if (percentage <= -5) return '✅';
return '';
}
/**
* Create a Markdown table from text rows
* @param {string[][]} rows
*/
function markdownTable(rows) {
if (rows.length == 0) {
return '';
}
// Skip all empty columns
while (rows.every(columns => !columns[columns.length - 1])) {
for (const columns of rows) {
columns.pop();
}
}
const [firstRow] = rows;
let columnLength = firstRow.length;
// Hide `Change` column if they are all `0 B`
if (columnLength === 3 && rows.every(columns => columns[2] === '0 B')) {
columnLength -= 1;
for (const columns of rows) {
columns.pop();
}
}
if (columnLength === 0) {
return '';
}
return [
// Header
['Filename', 'Size', 'Change', ''].slice(0, columnLength),
// Align
[':---', ':---:', ':---:', ':---:'].slice(0, columnLength),
// Body
...rows
].map(columns => `| ${columns.join(' | ')} |`).join('\n');
}
/**
* @typedef {Object} Diff
* @property {string} filename
* @property {number} size
* @property {number} delta
*/
/**
* Create a Markdown table showing diff data
* @param {Diff[]} files
* @param {object} options
* @param {boolean} [options.showTotal]
* @param {boolean} [options.collapseUnchanged]
* @param {boolean} [options.omitUnchanged]
* @param {number} [options.minimumChangeThreshold]
*/
export function diffTable(files, { showTotal, collapseUnchanged, omitUnchanged, minimumChangeThreshold }) {
let changedRows = [];
let unChangedRows = [];
let totalSize = 0;
let totalDelta = 0;
for (const file of files) {
const { filename, size, delta } = file;
totalSize += size;
totalDelta += delta;
const originalSize = size - delta;
const isUnchanged = Math.abs(delta) < minimumChangeThreshold;
if (isUnchanged && omitUnchanged) continue;
const columns = [
`\`${filename}\``,
prettyBytes(size),
getDeltaText(delta, originalSize),
iconForDifference(delta, originalSize)
];
if (isUnchanged && collapseUnchanged) {
unChangedRows.push(columns);
} else {
changedRows.push(columns);
}
}
let out = markdownTable(changedRows);
if (unChangedRows.length !== 0) {
const outUnchanged = markdownTable(unChangedRows);
out += `\n\n<details><summary>ℹ️ <strong>View Unchanged</strong></summary>\n\n${outUnchanged}\n\n</details>\n\n`;
}
if (showTotal) {
const totalOriginalSize = totalSize - totalDelta;
let totalDeltaText = getDeltaText(totalDelta, totalOriginalSize);
let totalIcon = iconForDifference(totalDelta, totalOriginalSize);
out = `**Total Size:** ${prettyBytes(totalSize)}\n\n${out}`;
out = `**Size Change:** ${totalDeltaText} ${totalIcon}\n\n${out}`;
}
return out;
}
/**
* Convert a string "true"/"yes"/"1" argument value to a boolean
* @param {string} v
*/
export function toBool(v) {
return /^(1|true|yes)$/.test(v);
}