persistent-merkle-tree: Performance issue with typescript 4.4.2

[twoeths]

With typescript 4.4.2, the node.ts is compiled to:

export abstract class Node implements HashObject {
  // this is to save an extra variable to check if a node has a root or not
  h0 = null as unknown as number;
  h1 = 0;
  h2 = 0;
  h3 = 0;
  h4 = 0;
  h5 = 0;
  h6 = 0;
  h7 = 0;

  abstract root: Uint8Array;
  abstract rootHashObject: HashObject;
  abstract left: Node;
  abstract right: Node;

  applyHash(root: HashObject): void {

this makes the performance test runs >10x slower as below

this is the profile with typescript 4.4.2
0908_monorepo.cpuprofile.zip

note the instance_members_initializer time, we don't have that with current version 4.2.3 which compiles node.ts to

class Node {
    constructor() {
        // this is to save an extra variable to check if a node has a root or not
        this.h0 = null;
        this.h1 = 0;
        this.h2 = 0;
        this.h3 = 0;
        this.h4 = 0;
        this.h5 = 0;
        this.h6 = 0;
        this.h7 = 0;
    }
    applyHash(root) {
        this.h0 = root.h0;
        this.h1 = root.h1;
        this.h2 = root.h2;
        this.h3 = root.h3;
        this.h4 = root.h4;
        this.h5 = root.h5;
        this.h6 = root.h6;
        this.h7 = root.h7;
    }
}

the profile with typescript 4.2.3
0908_separate_repo_ssz.cpuprofile.zip