Set falsy cause:es correctly on ErrorWithCause

Author: voxpelli

index.js

@@ -6,14 +6,14 @@ class ErrorWithCause extends Error { // linemod-prefix-with: export
    * @param {string} message
    * @param {{ cause?: T }} [options]
    */
-  constructor (message, { cause } = {}) {
+  constructor (message, options) {
     super(message);
 
     /** @type {string} */
     this.name = ErrorWithCause.name;
-    if (cause) {
-      /** @type {T} */
-      this.cause = cause;
+    if (options && Object.prototype.hasOwnProperty.call(options, 'cause')) {
+      /** @type {T|undefined} */
+      this.cause = options.cause;
     }
     /** @type {string} */
     this.message = message;

test/error.spec.js

@@ -37,4 +37,17 @@ describe('ErrorWithCause', () => {
     const err = new ErrorWithCause('Foo');
     err.should.have.property('stack').that.is.a('string').which.startsWith('ErrorWithCause: Foo\n');
   });
+
+  it('should set cause property when given undefined cause', () => {
+    (new ErrorWithCause('Foo', { cause: undefined })).should.have.property('cause', undefined);
+  });
+
+  it('should set cause property when given null cause', () => {
+    // eslint-disable-next-line unicorn/no-null
+    (new ErrorWithCause('Foo', { cause: null })).should.have.property('cause', null);
+  });
+
+  it('should set cause property when given false cause', () => {
+    (new ErrorWithCause('Foo', { cause: false })).should.have.property('cause', false);
+  });
 });