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dangerfile.js
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dangerfile.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
/* eslint-disable no-for-of-loops/no-for-of-loops */
// Hi, if this is your first time editing/reading a Dangerfile, here's a summary:
// It's a JS runtime which helps you provide continuous feedback inside GitHub.
//
// You can see the docs here: http://danger.systems/js/
//
// If you want to test changes Danger, I'd recommend checking out an existing PR
// and then running the `danger pr` command.
//
// You'll need a GitHub token, you can re-use this one:
//
// 0a7d5c3cad9a6dbec2d9 9a5222cf49062a4c1ef7
//
// (Just remove the space)
//
// So, for example:
//
// `DANGER_GITHUB_API_TOKEN=[ENV_ABOVE] yarn danger pr https://github.com/facebook/react/pull/11865
const {markdown, danger, warn} = require('danger');
const {promisify} = require('util');
const glob = promisify(require('glob'));
const gzipSize = require('gzip-size');
const {readFileSync, statSync} = require('fs');
const BASE_DIR = 'base-build';
const HEAD_DIR = 'build';
const CRITICAL_THRESHOLD = 0.02;
const SIGNIFICANCE_THRESHOLD = 0.002;
const CRITICAL_ARTIFACT_PATHS = new Set([
// We always report changes to these bundles, even if the change is
// insignificant or non-existent.
'oss-stable/react-dom/cjs/react-dom.production.min.js',
'oss-experimental/react-dom/cjs/react-dom.production.min.js',
'facebook-www/ReactDOM-prod.classic.js',
'facebook-www/ReactDOM-prod.modern.js',
'facebook-www/ReactDOMForked-prod.classic.js',
]);
const kilobyteFormatter = new Intl.NumberFormat('en', {
style: 'unit',
unit: 'kilobyte',
minimumFractionDigits: 2,
maximumFractionDigits: 2,
});
function kbs(bytes) {
return kilobyteFormatter.format(bytes / 1000);
}
const percentFormatter = new Intl.NumberFormat('en', {
style: 'percent',
signDisplay: 'exceptZero',
minimumFractionDigits: 2,
maximumFractionDigits: 2,
});
function change(decimal) {
if (Number === Infinity) {
return 'New file';
}
if (decimal === -1) {
return 'Deleted';
}
if (decimal < 0.0001) {
return '=';
}
return percentFormatter.format(decimal);
}
const header = `
| Name | +/- | Base | Current | +/- gzip | Base gzip | Current gzip |
| ---- | --- | ---- | ------- | -------- | --------- | ------------ |`;
function row(result, baseSha, headSha) {
const diffViewUrl = `https://react-builds.vercel.app/commits/${headSha}/files/${result.path}?compare=${baseSha}`;
const rowArr = [
`| [${result.path}](${diffViewUrl})`,
`**${change(result.change)}**`,
`${kbs(result.baseSize)}`,
`${kbs(result.headSize)}`,
`${change(result.changeGzip)}`,
`${kbs(result.baseSizeGzip)}`,
`${kbs(result.headSizeGzip)}`,
];
return rowArr.join(' | ');
}
(async function() {
// Use git locally to grab the commit which represents the place
// where the branches differ
const upstreamRepo = danger.github.pr.base.repo.full_name;
if (upstreamRepo !== 'facebook/react') {
// Exit unless we're running in the main repo
return;
}
let headSha;
let baseSha;
try {
headSha = String(readFileSync(HEAD_DIR + '/COMMIT_SHA')).trim();
baseSha = String(readFileSync(BASE_DIR + '/COMMIT_SHA')).trim();
} catch {
warn(
"Failed to read build artifacts. It's possible a build configuration " +
'has changed upstream. Try pulling the latest changes from the ' +
'main branch.'
);
return;
}
// Disable sizeBot in a Devtools Pull Request. Because that doesn't affect production bundle size.
const commitFiles = [
...danger.git.created_files,
...danger.git.deleted_files,
...danger.git.modified_files,
];
if (
commitFiles.every(filename => filename.includes('packages/react-devtools'))
)
return;
const resultsMap = new Map();
// Find all the head (current) artifacts paths.
const headArtifactPaths = await glob('**/*.js', {cwd: 'build'});
for (const artifactPath of headArtifactPaths) {
try {
// This will throw if there's no matching base artifact
const baseSize = statSync(BASE_DIR + '/' + artifactPath).size;
const baseSizeGzip = gzipSize.fileSync(BASE_DIR + '/' + artifactPath);
const headSize = statSync(HEAD_DIR + '/' + artifactPath).size;
const headSizeGzip = gzipSize.fileSync(HEAD_DIR + '/' + artifactPath);
resultsMap.set(artifactPath, {
path: artifactPath,
headSize,
headSizeGzip,
baseSize,
baseSizeGzip,
change: (headSize - baseSize) / baseSize,
changeGzip: (headSizeGzip - baseSizeGzip) / baseSizeGzip,
});
} catch {
// There's no matching base artifact. This is a new file.
const baseSize = 0;
const baseSizeGzip = 0;
const headSize = statSync(HEAD_DIR + '/' + artifactPath).size;
const headSizeGzip = gzipSize.fileSync(HEAD_DIR + '/' + artifactPath);
resultsMap.set(artifactPath, {
path: artifactPath,
headSize,
headSizeGzip,
baseSize,
baseSizeGzip,
change: Infinity,
changeGzip: Infinity,
});
}
}
// Check for base artifacts that were deleted in the head.
const baseArtifactPaths = await glob('**/*.js', {cwd: 'base-build'});
for (const artifactPath of baseArtifactPaths) {
if (!resultsMap.has(artifactPath)) {
const baseSize = statSync(BASE_DIR + '/' + artifactPath).size;
const baseSizeGzip = gzipSize.fileSync(BASE_DIR + '/' + artifactPath);
const headSize = 0;
const headSizeGzip = 0;
resultsMap.set(artifactPath, {
path: artifactPath,
headSize,
headSizeGzip,
baseSize,
baseSizeGzip,
change: -1,
changeGzip: -1,
});
}
}
const results = Array.from(resultsMap.values());
results.sort((a, b) => b.change - a.change);
let criticalResults = [];
for (const artifactPath of CRITICAL_ARTIFACT_PATHS) {
const result = resultsMap.get(artifactPath);
if (result === undefined) {
throw new Error(
'Missing expected bundle. If this was an intentional change to the ' +
'build configuration, update Dangerfile.js accordingly: ' +
artifactPath
);
}
criticalResults.push(row(result, baseSha, headSha));
}
let significantResults = [];
for (const result of results) {
// If result exceeds critical threshold, add to top section.
if (
(result.change > CRITICAL_THRESHOLD ||
0 - result.change > CRITICAL_THRESHOLD ||
// New file
result.change === Infinity ||
// Deleted file
result.change === -1) &&
// Skip critical artifacts. We added those earlier, in a fixed order.
!CRITICAL_ARTIFACT_PATHS.has(result.path)
) {
criticalResults.push(row(result, baseSha, headSha));
}
// Do the same for results that exceed the significant threshold. These
// will go into the bottom, collapsed section. Intentionally including
// critical artifacts in this section, too.
if (
result.change > SIGNIFICANCE_THRESHOLD ||
0 - result.change > SIGNIFICANCE_THRESHOLD ||
result.change === Infinity ||
result.change === -1
) {
significantResults.push(row(result, baseSha, headSha));
}
}
markdown(`
Comparing: ${baseSha}...${headSha}
## Critical size changes
Includes critical production bundles, as well as any change greater than ${CRITICAL_THRESHOLD *
100}%:
${header}
${criticalResults.join('\n')}
## Significant size changes
Includes any change greater than ${SIGNIFICANCE_THRESHOLD * 100}%:
${
significantResults.length > 0
? `
<details>
<summary>Expand to show</summary>
${header}
${significantResults.join('\n')}
</details>
`
: '(No significant changes)'
}
`);
})();