snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

web/babel.config.js

@@ -0,0 +1,38 @@
+// @ts-check
+
+import path from "node:path";
+
+import _ from "lodash";
+
+/** @type {Parameters<typeof import("babel-plugin-formatjs").default>[1]} */
+const formatJsOptions = {
+    additionalFunctionNames: ["$t", "$t_html"],
+    overrideIdFn: (_id, defaultMessage) => defaultMessage ?? "",
+};
+
+/** @type {import("@babel/preset-env").Options} */
+const presetEnvOptions = {
+    shippedProposals: true,
+};
+
+/** @type {import("@babel/core").PluginItem} */
+const istanbulPlugin = ["istanbul", {exclude: []}];
+
+/** @type {import("@babel/core").InputOptions} */
+const config = {
+    only: [new RegExp("^" + _.escapeRegExp(path.resolve(import.meta.dirname, "src") + path.sep))],
+    plugins: [
+        ["formatjs", formatJsOptions],
+        ["polyfill-corejs3", {method: "usage-global", version: "3.49"}],
+    ],
+    presets: [["@babel/preset-env", presetEnvOptions], "@babel/typescript"],
+    env: {
+        test: {
+            plugins: [
+                ...(process.env["USING_INSTRUMENTED_CODE"] ? [istanbulPlugin] : []),
+                ["@babel/plugin-transform-modules-commonjs", {lazy: () => true}],
+            ],
+        },
+    },
+};
+export default config;