feat: stream rendering, closed #361 fixes #360

src/emitters/emitter.ts

@@ -0,0 +1,4 @@
+export interface Emitter {
+  write (html: any): void;
+  end (): void;
+}

src/emitters/keeping-type-emitter.ts

@@ -0,0 +1,22 @@
+import { stringify, toValue } from '../util/underscore'
+
+export class KeepingTypeEmitter {
+  public html: any = '';
+
+  public write (html: any) {
+    html = toValue(html)
+    // This will only preserve the type if the value is isolated.
+    // I.E:
+    // {{ my-port }} -> 42
+    // {{ my-host }}:{{ my-port }} -> 'host:42'
+    if (typeof html !== 'string' && this.html === '') {
+      this.html = html
+    } else {
+      this.html = stringify(this.html) + stringify(html)
+    }
+  }
+
+  public end () {
+    return this.html
+  }
+}

src/emitters/simple-emitter.ts

@@ -0,0 +1,14 @@
+import { stringify } from '../util/underscore'
+import { Emitter } from './emitter'
+
+export class SimpleEmitter implements Emitter {
+  public html: any = '';
+
+  public write (html: any) {
+    this.html += stringify(html)
+  }
+
+  public end () {
+    return this.html
+  }
+}

src/emitters/streamed-emitter.ts

@@ -0,0 +1,12 @@
+import { stringify } from '../util/underscore'
+
+export class StreamedEmitter {
+  public html: any = '';
+  public stream = new (require('stream').PassThrough)()
+  public write (html: any) {
+    this.stream.write(stringify(html))
+  }
+  public end () {
+    this.stream.end()
+  }
+}