implementing #24

vitaly-t · Nov 14, 2019 · 90373f1 · 90373f1
1 parent 4d2166e
commit 90373f1
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Showing 2 changed files with 9 additions and 0 deletions.
diff --git a/src/main.ts b/src/main.ts
@@ -51,6 +51,10 @@ export class ConnectionString {
 
     constructor(cs: string, defaults?: IConnectionDefaults) {
 
+        if (!(this instanceof ConnectionString)) {
+            throw new TypeError('Class constructor ConnectionString cannot be invoked without \'new\'');
+        }
+
         if (typeof cs !== 'string') {
             throw new TypeError('Invalid connection string: ' + JSON.stringify(cs));
         }

diff --git a/test/main.spec.ts b/test/main.spec.ts
@@ -22,6 +22,11 @@ function create(defaults: IConnectionDefaults): string {
 }
 
 describe('init', () => {
+    it('must throw when used as a function', () => {
+        expect(() => {
+            (ConnectionString as any)();
+        }).to.throw('Class constructor ConnectionString cannot be invoked without \'new\'');
+    });
     it('must throw on a non-string', () => {
         const error = 'Invalid connection string: ';
         expect(() => {