feat: create DynamicBuffer with initial data.

Author: ghosind

src/dynamicBuffer.ts

@@ -76,7 +76,25 @@ export class DynamicBuffer {
 
   private factor: number;
 
-  constructor(options?: DynamicBufferOptions) {
+  constructor();
+
+  constructor(options: DynamicBufferOptions);
+
+  constructor(data: string);
+
+  constructor(data: string, options: DynamicBufferOptions);
+
+  constructor(
+    data?: string | DynamicBufferOptions,
+    options?: DynamicBufferOptions,
+  ) {
+    if (typeof data !== 'string') {
+      // eslint-disable-next-line no-param-reassign
+      options = data;
+      // eslint-disable-next-line no-param-reassign
+      data = undefined;
+    }
+
     if (options?.size !== undefined) {
       this.size = options.size;
     } else {
@@ -99,6 +117,10 @@ export class DynamicBuffer {
     if (this.size > 0) {
       this.buffer = Buffer.alloc(this.size, this.fill, this.encoding);
     }
+
+    if (data) {
+      this.append(data);
+    }
   }
 
   /**

test/dynamicBuffer.spec.ts

@@ -31,13 +31,21 @@ describe('Initialization tests', () => {
     assert.throws(() => new DynamicBuffer({ size: constants.MAX_LENGTH + 1 }));
   });
 
-  it("Test initializing with invalid factor", () => {
+  it('Test initializing with invalid factor', () => {
     assert.throws(() => {
+      // eslint-disable-next-line no-new
       new DynamicBuffer({
         factor: -1,
       });
     });
   });
+
+  it('Test initializing with initial data', () => {
+    const data = 'Hello world';
+    const buffer = new DynamicBuffer(data);
+
+    assert.equal(buffer.toString(), data);
+  });
 });
 
 describe('Resize tests', () => {