Make value evaluation opt-in

src/index.js

@@ -10,24 +10,32 @@ function evaluateValue(value) {
 	}
 }
 
-function defaultValue(value, fallbackValue) {
+function maybeEvaluateValue(value, evaluate) {
-	value = evaluateValue(value);
+	if (evaluate === true) {
+		return evaluateValue(value);
+	} else {
+		return value;
+	}
+}
+
+function defaultValue(value, fallbackValue, options = {}) {
+	value = maybeEvaluateValue(value, options.evaluate);
 
 	if (value != null) {
 		return value;
 	} else {
-		return evaluateValue(fallbackValue);
+		return maybeEvaluateValue(fallbackValue, options.evaluate);
 	}
 }
 
-defaultValue.async = function defaultAsyncValue(value, fallbackValue) {
+defaultValue.async = function defaultAsyncValue(value, fallbackValue, options = {}) {
 	return promiseTry(() => {
-		return evaluateValue(value);
+		return maybeEvaluateValue(value, options.evaluate);
 	}).then((resultValue) => {
 		if (resultValue != null) {
 			return resultValue;
 		} else {
-			return evaluateValue(fallbackValue);
+			return maybeEvaluateValue(fallbackValue, options.evaluate);
 		}
 	})
 }