1 files changed, 59 insertions, 0 deletions
diff --git a/config/esbuild.config.js b/config/esbuild.config.js
new file mode 100644
index 00000000000..e876436e864
--- /dev/null
+++ b/config/esbuild.config.js
@@ -0,0 +1,59 @@
+const browserslist = require('browserslist');
+const esbuild = require('esbuild');
+
+const ESBUILD_SUPPORTED_TARGETS = new Set([
+  'chrome',
+  'edge',
+  'firefox',
+  'hermes',
+  'ie',
+  'ios',
+  'node',
+  'opera',
+  'rhino',
+  'safari',
+]);
+
+const parseBrowserslist = (browserslistResult) => {
+  return browserslistResult.map((browsers) => {
+    const [family, version] = browsers.split(' ');
+    let normalizedVersion = version;
+
+    // browserslist can return a range: safari15.2-15.4
+    if (version.indexOf('-') >= -1) {
+      // we take the lowest version
+      [normalizedVersion] = version.split('-');
+    }
+
+    return {
+      family,
+      version: normalizedVersion,
+    };
+  });
+};
+
+const mapBrowserslistToESBuildTarget = (browsersList) => {
+  return parseBrowserslist(browsersList)
+    .filter(({ family, version }) => {
+      if (!ESBUILD_SUPPORTED_TARGETS.has(family)) {
+        console.warning('Unknown ESBuild target %s, version %s', family, version);
+        return false;
+      }
+
+      return true;
+    })
+    .map(({ family, version }) => {
+      return `${family}${version}`;
+    });
+};
+
+module.exports = {
+  target: mapBrowserslistToESBuildTarget(browserslist()),
+  supported: {
+    'optional-chain': false,
+    'nullish-coalescing': false,
+    'class-static-field': false,
+    'class-field': false,
+  },
+  implementation: esbuild,
+};