feat: errorCode option for ensure* utils

README.md

@@ -67,6 +67,7 @@ Each `*/ensure` utility, accepts following options (eventually passed with secon
 - `errorMessage` - Custom error message. Following placeholders can be used:
   - `%v` - To be replaced with short string representation of invalid value
   - `%n` - To be replaced with meaninfgul name (to be passed with `name` option) of validated value. Not effective if `name` option is not present
+- `errorCode` - Eventual error code to be exposed on `.code` error property
 - `name` - Meaningful name for validated value, to be used in error message, assuming it contains `%n` placeholder
 - `Error` - Alternative error constructor to be used (defaults to `TypeError`)
 

lib/resolve-exception.js

@@ -9,5 +9,7 @@ module.exports = function (value, defaultMessage, inputOptions) {
 		if (inputOptions.isOptional) return null;
 	}
 	var ErrorConstructor = (inputOptions && inputOptions.Error) || TypeError;
-	throw new ErrorConstructor(resolveErrorMessage(defaultMessage, value, inputOptions));
+	var error = new ErrorConstructor(resolveErrorMessage(defaultMessage, value, inputOptions));
+	if (inputOptions && inputOptions.errorCode) error.code = inputOptions.errorCode;
+	throw error;
 };

test/lib/resolve-exception.js

@@ -37,4 +37,12 @@ describe("lib/handle-exception", function () {
 			assert.equal(error.message, "Invalid value");
 		}
 	});
+	it("Should support error code option", function () {
+		try {
+			handleException(12, "Invalid value", { errorCode: "SOME_CODE" });
+			throw new Error("Unexpected");
+		} catch (error) {
+			assert.equal(error.code, "SOME_CODE");
+		}
+	});
 });