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import assert from "assert";
import cp from "child_process";
const baseRepo = process.argv[2];
const headRepo = process.argv[3];
/** @type {Array<{ size: number, unpackedSize: number; files: Array<{ path: string; size: number; }>; }>} */
const [before, after] = JSON.parse(cp.execFileSync("npm", ["pack", "--dry-run", "--json", baseRepo, headRepo], { encoding: "utf8" }));
/** @param {{ path: string; size: number; }[]} files */
function filesToMap(files) {
return new Map(files.map(f => [f.path, f.size]));
}
const beforeFileToSize = filesToMap(before.files);
const afterFileToSize = filesToMap(after.files);
/**
* @param {number} before
* @param {number} after
*/
function failIfTooBig(before, after) {
if (after > (before * 1.1)) {
process.exitCode = 1;
}
}
/**
* @param {number} value
*/
function sign(value) {
return value > 0 ? "+" : "-";
}
const units = ["B", "KiB", "MiB", "GiB"];
/**
* @param {number} size
*/
function prettyPrintSize(size) {
assert(size >= 0);
let i = 0;
while (size > 1024) {
i++;
size /= 1024;
}
return `${size.toFixed(2)} ${units[i]}`;
}
/**
* @param {number} before
* @param {number} after
*/
function prettyPrintSizeDiff(before, after) {
const diff = after - before;
return sign(diff) + prettyPrintSize(Math.abs(diff));
}
/**
* @param {number} before
* @param {number} after
*/
function prettyPercentDiff(before, after) {
const percent = 100 * (after - before) / before;
return `${sign(percent)}${Math.abs(percent).toFixed(2)}%`;
}
/**
* @param {string[]} header
* @param {string[][]} data
*/
function logTable(header, data) {
/** @type {string[]} */
const lines = [];
/**
* @param {string[]} row
*/
function addRow(row) {
lines.push("| " + row.join(" | ") + " |");
}
addRow(header);
addRow(new Array(header.length).fill("-"));
for (const row of data) {
addRow(row);
}
console.log(lines.join("\n"));
}
console.log(`# Package size report`);
console.log();
console.log(`## Overall package size`);
console.log();
if (before.size === after.size && before.unpackedSize === after.unpackedSize) {
console.log("No change.");
}
else {
logTable(
["", "Before", "After", "Diff", "Diff (percent)"],
[
[
"Packed",
prettyPrintSize(before.size),
prettyPrintSize(after.size),
prettyPrintSizeDiff(before.size, after.size),
prettyPercentDiff(before.size, after.size),
],
[
"Unpacked",
prettyPrintSize(before.unpackedSize),
prettyPrintSize(after.unpackedSize),
prettyPrintSizeDiff(before.unpackedSize, after.unpackedSize),
prettyPercentDiff(before.unpackedSize, after.unpackedSize),
],
],
);
}
failIfTooBig(before.size, after.size);
failIfTooBig(before.unpackedSize, after.unpackedSize);
console.log();
/** @type {Map<string, number>} */
const fileCounts = new Map();
const inBefore = -1;
const inAfter = 1;
/**
* @param {Iterable<string>} paths
* @param {-1 | 1} marker
*/
function addFiles(paths, marker) {
for (const p of paths) {
fileCounts.set(p, (fileCounts.get(p) ?? 0) + marker);
}
}
addFiles(beforeFileToSize.keys(), inBefore);
addFiles(afterFileToSize.keys(), inAfter);
const allEntries = [...fileCounts.entries()];
const commonFiles = allEntries.filter(([, count]) => count === 0).map(([path]) => path);
const beforeOnly = allEntries.filter(([, count]) => count === inBefore).map(([path]) => path);
const afterOnly = allEntries.filter(([, count]) => count === inAfter).map(([path]) => path);
const commonData = commonFiles.map(path => {
const beforeSize = beforeFileToSize.get(path) ?? 0;
const afterSize = afterFileToSize.get(path) ?? 0;
return { path, beforeSize, afterSize };
})
.filter(({ beforeSize, afterSize }) => beforeSize !== afterSize)
.map(({ path, beforeSize, afterSize }) => {
return [
"`" + path + "`",
prettyPrintSize(beforeSize),
prettyPrintSize(afterSize),
prettyPrintSizeDiff(beforeSize, afterSize),
prettyPercentDiff(beforeSize, afterSize),
];
});
if (commonData.length > 0) {
console.log(`## Files`);
console.log();
logTable(["", "Before", "After", "Diff", "Diff (percent)"], commonData);
console.log();
}
if (afterOnly.length > 0) {
console.log(`## New files`);
console.log();
logTable(
["", "Size"],
afterOnly.map(path => {
const afterSize = afterFileToSize.get(path) ?? 0;
return { path, afterSize };
})
.map(({ path, afterSize }) => {
return ["`" + path + "`", prettyPrintSize(afterSize)];
}),
);
console.log();
}
if (beforeOnly.length > 0) {
console.log(`## Deleted files`);
console.log();
logTable(
["", "Size"],
beforeOnly.map(path => {
const afterSize = afterFileToSize.get(path) ?? 0;
return { path, afterSize };
})
.map(({ path, afterSize }) => {
return ["`" + path + "`", prettyPrintSize(afterSize)];
}),
);
console.log();
}