first commit

public/assets/quill-delta/src/Op.ts

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+import AttributeMap from './AttributeMap';
+
+interface Op {
+  // only one property out of {insert, delete, retain} will be present
+  insert?: string | Record<string, unknown>;
+  delete?: number;
+  retain?: number | Record<string, unknown>;
+
+  attributes?: AttributeMap;
+}
+
+namespace Op {
+  export function length(op: Op): number {
+    if (typeof op.delete === 'number') {
+      return op.delete;
+    } else if (typeof op.retain === 'number') {
+      return op.retain;
+    } else if (typeof op.retain === 'object' && op.retain !== null) {
+      return 1;
+    } else {
+      return typeof op.insert === 'string' ? op.insert.length : 1;
+    }
+  }
+}
+
+export default Op;