update cuz presentation

utils/snowflake.ts

@@ -0,0 +1,51 @@
+export default class Snowflake {
+  static current_increment = 0n;
+
+  public static increment() {
+    this.current_increment = BigInt.asUintN(12, this.current_increment + 1n);
+    return this.current_increment;
+  }
+
+  state = 0n;
+  public set_timestamp(value: number | bigint) {
+    value = BigInt.asUintN(64 - 22, BigInt(value));
+    const state = BigInt.asUintN(22, this.state);
+    this.state = state + (value << 22n);
+  }
+
+  public set_machineid(value: number | bigint) {
+    value = BigInt.asUintN(12 - 17, BigInt(value));
+    const state = BigInt.asUintN(17, this.state) + (this.state >> 22n) << 22n;
+    this.state = state + (value << 12n);
+  }
+
+  public set_processid(value: number | bigint) {
+    value = BigInt.asUintN(17 - 12, BigInt(value));
+    const state = BigInt.asUintN(12, this.state) + (this.state >> 17n) << 17n;
+    this.state = state + (value << 12n);
+  }
+
+  public set_increment(value: number | bigint) {
+    value = BigInt.asUintN(12 - 0, BigInt(value));
+    const state = (this.state >> 12n) << 12n;
+    this.state = state + (value << 0n);
+  }
+
+  constructor(value?: bigint) {
+    if (value) {
+      this.state = BigInt.asUintN(64, value);
+      return;
+    }
+    this.set_timestamp(Date.now());
+    this.set_processid(1);
+    this.set_increment(Snowflake.increment());
+  }
+
+  public toString() {
+    return this.state.toString();
+  }
+
+  public get timestamp() {
+    return BigInt.asUintN(64 - 22, this.state >> 22n);
+  }
+}