wehub-resource-sync
37 lines
922 B
TypeScript
37 lines
922 B
TypeScript
import * as path from 'path';
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import * as fs from 'fs';
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import browserslist = require('browserslist');
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const VALID_BROWSERSLIST_FILES = ['.browserslistrc', 'browserslist'];
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const ES5_BROWSERS = [
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'ie 10',
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'ie 11',
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'safari 11',
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'safari 11.1',
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'safari 12',
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'safari 12.1',
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'safari 13',
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'ios_saf 13.0',
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'ios_saf 13.3',
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];
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export function getTerserEcmaVersion(projectRoot: string): 2020 | 5 {
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let pathToBrowserslistFile = '';
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for (const browserslistFile of VALID_BROWSERSLIST_FILES) {
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const fullPathToFile = path.join(projectRoot, browserslistFile);
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if (fs.existsSync(fullPathToFile)) {
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pathToBrowserslistFile = fullPathToFile;
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break;
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}
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}
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if (!pathToBrowserslistFile) {
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return 2020;
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}
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const env = browserslist.loadConfig({ path: pathToBrowserslistFile });
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const browsers = browserslist(env);
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return browsers.some((b) => ES5_BROWSERS.includes(b)) ? 5 : 2020;
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}
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