handle multi-line comments

build.ts

@@ -30,6 +30,7 @@ const spritesPath = {
 class Minifier {
   private buffer = "";
   private lines: Array<string> = [];
+  private insideComment = false;
   stream;
 
   constructor(writableStream: WritableStream) {
@@ -51,6 +52,32 @@ class Minifier {
   }
 
   private processChunk(): string {
+    const commentFullRegex = /\/\*.*\*\//;
+    const commentStartRegex = /(.*)\/\*(.*)/;
+    const commentEndRegex = /(.*)\*\/(.*)/;
+
+    if (this.insideComment) {
+      const matches = this.buffer.match(commentEndRegex);
+      if (matches === null) {
+        this.buffer = '';
+        return '';
+      }
+
+      this.buffer = matches[2];
+      this.insideComment = false;
+    }
+
+    if (!this.insideComment) {
+      this.buffer = this.buffer.replace(commentFullRegex, '');
+
+      const matches = this.buffer.match(commentStartRegex);
+      if (matches !== null) {
+        this.buffer = matches[1];
+        this.insideComment = true;
+        return '';
+      }
+    }
+
     const newLines = this.buffer.split("\n");
     this.buffer = newLines.pop() as string; // keep the last (potentially incomplete) line