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Refactor and improve build output (facebook#2202)
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@gaearon
gaearon authored May 18, 2017
1 parent 0cb605e commit bacbf59
Showing 1 changed file with 58 additions and 142 deletions.
200 changes: 58 additions & 142 deletions scripts/build.js
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Original file line number Diff line number Diff line change
Expand Up @@ -23,14 +23,15 @@ process.on('unhandledRejection', err => {
// Ensure environment variables are read.
require('../config/env');

const path = require('path');
const chalk = require('chalk');
const fs = require('fs-extra');
const path = require('path');
const url = require('url');
const webpack = require('webpack');
const config = require('../config/webpack.config.prod');
const paths = require('../config/paths');
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
const FileSizeReporter = require('react-dev-utils/FileSizeReporter');

const measureFileSizesBeforeBuild = FileSizeReporter.measureFileSizesBeforeBuild;
Expand All @@ -44,159 +45,74 @@ if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {

// First, read the current file sizes in build directory.
// This lets us display how much they changed later.
measureFileSizesBeforeBuild(paths.appBuild).then(previousFileSizes => {
// Remove all content but keep the directory so that
// if you're in it, you don't end up in Trash
fs.emptyDirSync(paths.appBuild);

// Start the webpack build
build(previousFileSizes);

// Merge with the public folder
copyPublicFolder();
});

// Print out errors
function printErrors(summary, errors) {
console.log(chalk.red(summary));
console.log();
errors.forEach(err => {
console.log(err.message || err);
console.log();
});
}

// Create the production build and print the deployment instructions.
function build(previousFileSizes) {
console.log('Creating an optimized production build...');

let compiler;
try {
compiler = webpack(config);
} catch (err) {
printErrors('Failed to compile.', [err]);
process.exit(1);
}

compiler.run((err, stats) => {
if (err) {
printErrors('Failed to compile.', [err]);
process.exit(1);
}
measureFileSizesBeforeBuild(paths.appBuild)
.then(previousFileSizes => {
// Remove all content but keep the directory so that
// if you're in it, you don't end up in Trash
fs.emptyDirSync(paths.appBuild);
// Merge with the public folder
copyPublicFolder();
// Start the webpack build
return build(previousFileSizes);
})
.then(
({ stats, previousFileSizes }) => {
console.log(chalk.green('Compiled successfully.'));
console.log();

if (stats.compilation.errors.length) {
printErrors('Failed to compile.', stats.compilation.errors);
process.exit(1);
}
console.log('File sizes after gzip:');
console.log();
printFileSizesAfterBuild(stats, previousFileSizes);
console.log();

if (process.env.CI && stats.compilation.warnings.length) {
printErrors(
'Failed to compile. When process.env.CI = true, warnings are treated as failures. Most CI servers set this automatically.',
stats.compilation.warnings
const appPackage = require(paths.appPackageJson);
const publicUrl = paths.publicUrl;
const publicPath = config.output.publicPath;
const buildFolder = path.relative(process.cwd(), paths.appBuild);
printHostingInstructions(
appPackage,
publicUrl,
publicPath,
buildFolder,
useYarn
);
},
err => {
console.log(chalk.red('Failed to compile.'));
console.log();
console.log(err.message || err);
console.log();
process.exit(1);
}
);

console.log(chalk.green('Compiled successfully.'));
console.log();

console.log('File sizes after gzip:');
console.log();
printFileSizesAfterBuild(stats, previousFileSizes);
console.log();
// Create the production build and print the deployment instructions.
function build(previousFileSizes) {
console.log('Creating an optimized production build...');

const appPackage = require(paths.appPackageJson);
const publicUrl = paths.publicUrl;
const publicPath = config.output.publicPath;
const publicPathname = url.parse(publicPath).pathname;
if (publicUrl && publicUrl.indexOf('.github.io/') !== -1) {
// "homepage": "http://user.github.io/project"
console.log(
`The project was built assuming it is hosted at ${chalk.green(publicPathname)}.`
);
console.log(
`You can control this with the ${chalk.green('homepage')} field in your ${chalk.cyan('package.json')}.`
);
console.log();
console.log(`The ${chalk.cyan('build')} folder is ready to be deployed.`);
console.log(`To publish it at ${chalk.green(publicUrl)}, run:`);
// If script deploy has been added to package.json, skip the instructions
if (typeof appPackage.scripts.deploy === 'undefined') {
console.log();
if (useYarn) {
console.log(` ${chalk.cyan('yarn')} add --dev gh-pages`);
} else {
console.log(` ${chalk.cyan('npm')} install --save-dev gh-pages`);
}
console.log();
console.log(
`Add the following script in your ${chalk.cyan('package.json')}.`
);
console.log();
console.log(` ${chalk.dim('// ...')}`);
console.log(` ${chalk.yellow('"scripts"')}: {`);
console.log(` ${chalk.dim('// ...')}`);
console.log(
` ${chalk.yellow('"predeploy"')}: ${chalk.yellow('"npm run build",')}`
);
console.log(
` ${chalk.yellow('"deploy"')}: ${chalk.yellow('"gh-pages -d build"')}`
);
console.log(' }');
console.log();
console.log('Then run:');
let compiler = webpack(config);
return new Promise((resolve, reject) => {
compiler.run((err, stats) => {
if (err) {
return reject(err);
}
console.log();
console.log(` ${chalk.cyan(useYarn ? 'yarn' : 'npm')} run deploy`);
console.log();
} else if (publicPath !== '/') {
// "homepage": "http://mywebsite.com/project"
console.log(
`The project was built assuming it is hosted at ${chalk.green(publicPath)}.`
);
console.log(
`You can control this with the ${chalk.green('homepage')} field in your ${chalk.cyan('package.json')}.`
);
console.log();
console.log(`The ${chalk.cyan('build')} folder is ready to be deployed.`);
console.log();
} else {
if (publicUrl) {
// "homepage": "http://mywebsite.com"
console.log(
`The project was built assuming it is hosted at ${chalk.green(publicUrl)}.`
);
console.log(
`You can control this with the ${chalk.green('homepage')} field in your ${chalk.cyan('package.json')}.`
);
console.log();
} else {
// no homepage
console.log(
'The project was built assuming it is hosted at the server root.'
);
console.log(
`To override this, specify the ${chalk.green('homepage')} in your ${chalk.cyan('package.json')}.`
);
console.log('For example, add this to build it for GitHub Pages:');
const messages = formatWebpackMessages(stats.toJson({}, true));
if (messages.errors.length) {
return reject(new Error(messages.errors.join('\n\n')));
}
if (process.env.CI && messages.warnings.length) {
console.log();
console.log(
` ${chalk.green('"homepage"')} ${chalk.cyan(':')} ${chalk.green('"http://myname.github.io/myapp"')}${chalk.cyan(',')}`
chalk.yellow(
'Treating warnings as errors because process.env.CI = true.\n' +
'Most CI servers set it automatically.'
)
);
console.log();
return reject(new Error(messages.warnings.join('\n\n')));
}
const build = path.relative(process.cwd(), paths.appBuild);
console.log(`The ${chalk.cyan(build)} folder is ready to be deployed.`);
console.log('You may serve it with a static server:');
console.log();
if (useYarn) {
console.log(` ${chalk.cyan('yarn')} global add serve`);
} else {
console.log(` ${chalk.cyan('npm')} install -g serve`);
}
console.log(` ${chalk.cyan('serve')} -s build`);
console.log();
}
return resolve({ stats, previousFileSizes });
});
});
}

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