this.userSettingsSource = userSettingsSource;
            return this;
        }

        public SettingsBuilderRequestBuilder interpolationSource(UnaryOperator<String> interpolationSource) {
            this.interpolationSource = interpolationSource;
            return this;
        }

        public SettingsBuilderRequest build() {
            return new DefaultSettingsBuilderRequest(

                        userSettingsFile != null && Files.exists(userSettingsFile)
                                ? Sources.fromPath(userSettingsFile)
                                : null)
                .interpolationSource(interpolationSource)
                .build();

        customizeSettingsRequest(context, settingsRequest);
        if (context.eventSpyDispatcher != null) {
            context.eventSpyDispatcher.onEvent(settingsRequest);