Add trimmed flag to chai-dom

types/chai-dom/chai-dom-tests.ts

@@ -13,6 +13,7 @@ function test() {
     expect(testElement).to.have.id('id');
     expect(testElement).to.have.html('foo');
     expect(testElement).to.have.text('foo');
+    expect(testElement).to.have.trimmed.text('foo');
     expect(testElement).to.have.text(['foo', 'bar']);
     expect(testElement).to.have.value('foo');
     expect(testElement).to.be.empty;

types/chai-dom/index.d.ts

@@ -35,6 +35,8 @@ declare namespace Chai {
 
         displayed: Assertion;
 
+        trimmed: Assertion;
+
     }
 
     interface Include {