first commit

node_modules/metro-config/src/__fixtures__/merged.metro.config.js

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+"use strict";
+
+const { mergeConfig } = require("../loadConfig");
+const secondConfig = (previous) => ({
+  resolver: {
+    sourceExts: ["before", ...previous.resolver.sourceExts],
+  },
+});
+const thirdConfig = (previous) => ({
+  resolver: {
+    sourceExts: [...previous.resolver.sourceExts, "after"],
+  },
+});
+module.exports = (metroDefaults) =>
+  mergeConfig(metroDefaults, secondConfig, thirdConfig);