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node_modules/@11ty/eleventy/src/Util/PassthroughCopyBehaviorCheck.js

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+function isUsingEleventyDevServer(config) {
+	return (
+		!config.serverOptions.module || config.serverOptions.module === "@11ty/eleventy-dev-server"
+	);
+}
+
+// Config opt-out via serverPassthroughCopyBehavior
+// False when other server is used
+// False when runMode is "build" or "watch"
+export default function (config, runMode) {
+	return (
+		config.serverPassthroughCopyBehavior === "passthrough" &&
+		isUsingEleventyDevServer(config) &&
+		runMode === "serve"
+	);
+}