60 lines
1.3 KiB
JavaScript
60 lines
1.3 KiB
JavaScript
const browserslist = require('browserslist');
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const esbuild = require('esbuild');
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const ESBUILD_SUPPORTED_TARGETS = new Set([
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'chrome',
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'edge',
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'firefox',
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'hermes',
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'ie',
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'ios',
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'node',
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'opera',
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'rhino',
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'safari',
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]);
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const parseBrowserslist = (browserslistResult) => {
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return browserslistResult.map((browsers) => {
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const [family, version] = browsers.split(' ');
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let normalizedVersion = version;
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// browserslist can return a range: safari15.2-15.4
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if (version.indexOf('-') >= -1) {
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// we take the lowest version
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[normalizedVersion] = version.split('-');
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}
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return {
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family,
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version: normalizedVersion,
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};
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});
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};
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const mapBrowserslistToESBuildTarget = (browsersList) => {
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return parseBrowserslist(browsersList)
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.filter(({ family, version }) => {
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if (!ESBUILD_SUPPORTED_TARGETS.has(family)) {
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console.warning('Unknown ESBuild target %s, version %s', family, version);
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return false;
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}
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return true;
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})
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.map(({ family, version }) => {
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return `${family}${version}`;
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});
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};
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module.exports = {
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target: mapBrowserslistToESBuildTarget(browserslist()),
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supported: {
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'optional-chain': false,
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'nullish-coalescing': false,
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'class-static-field': false,
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'class-field': false,
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},
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implementation: esbuild,
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};
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