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// https://github.com/babel/babel/blob/v7.26.2/packages/babel-compat-data/scripts/build-data.js
// https://github.com/babel/babel/blob/v7.26.2/packages/babel-compat-data/scripts/utils-build-data.js
const fs = require('node:fs');
const envs = require('./compat-table/environments');
const parseEnvsVersions = require('./compat-table/build-utils/parse-envs-versions');
const interpolateAllResults = require('./compat-table/build-utils/interpolate-all-results');
const compareVersions = require('./compat-table/build-utils/compare-versions');
const { addElectronSupportFromChromium } = require('./chromium-to-electron');
const esFeatures = require(`./es-features`);
const environments = [
'chrome',
'opera',
'edge',
'firefox',
'safari',
'node',
'deno',
'ie',
'android',
'ios',
// 'phantom',
'samsung',
'rhino',
'opera_mobile',
];
const envsVersions = parseEnvsVersions(envs);
const compatSources = ['es5', 'es6', 'es2016plus', 'esnext'].map(source => {
const data = require(`./compat-table/data-${source}`);
interpolateAllResults(data.tests, envs);
return data;
});
const compatibilityTests = compatSources.flatMap(data =>
data.tests.flatMap(test => {
if (!test.subtests) return test;
return test.subtests.map(subtest =>
Object.assign({}, subtest, {
name: test.name + ' / ' + subtest.name,
group: test.name,
})
);
})
);
const getLowestImplementedVersion = (
{ features },
env,
exclude = () => false,
) => {
const tests = compatibilityTests.filter(test => {
let ok = features.includes(test.name);
ok ||= test.group && features.includes(test.group);
ok ||= features.length === 1 && test.name.startsWith(features[0]);
ok &&= !exclude(test.name);
return ok;
});
const envTests = tests.map(({ res }) => {
const versions = envsVersions[env];
let i = versions.length - 1;
// Find the last not-implemented version
for (; i >= 0; i--) {
const { id } = versions[i];
// Babel assumes strict mode
if (res[id] !== true && res[id] !== 'strict') {
break;
}
}
5876
return envsVersions[env][i + 1];
});
if (envTests.length === 0 || envTests.some(t => !t)) return null;
const result = envTests.reduce((a, b) => {
return compareVersions(a, b) > 0 ? a : b;
});
// NOTE(bng): A number of environments in compat-table changed to
// include a trailing zero (node10 -> node10_0), so for now stripping
// it to be consistent
return result.version.join('.').replace(/\.0$/, '');
};
const expandFeatures = features =>
features.flatMap(feat => {
if (feat.includes('/')) return [feat];
return compatibilityTests
.map(test => test.name)
.filter(name => name === feat || name.startsWith(feat + ' / '));
});
const generateData = (environments, items) => {
for (const item of items) {
const targets = {};
environments.forEach(env => {
const version = getLowestImplementedVersion({
features: expandFeatures(item.features),
}, env);
if (version) targets[env] = version;
});
addElectronSupportFromChromium(targets);
item.targets = targets;
}
return items;
};
const items = generateData(environments, esFeatures);
fs.writeFileSync('./data.json', JSON.stringify(items, null, 2));