# apps/server/src/checkpointing/Utils.ts · gitcafe/t3code

[View on GitCafe](https://git.cafe/gitcafe/t3code/blob/bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00/apps/server/src/checkpointing/Utils.ts)

Repository: [gitcafe/t3code](https://git.cafe/gitcafe/t3code)

Visibility: public

Requested revision: bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00

Requested commit: bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00

Commit: bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00

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[Immutable source](https://git.cafe/gitcafe/t3code/blob/bc03c3640d6d3bb44e5fb477bfd78d7484cd0e00/apps/server/src/checkpointing/Utils.ts?format=markdown)

```
import * as Encoding from "effect/Encoding";
import { CheckpointRef, ProjectId, type ThreadId } from "@t3tools/contracts";

export const CHECKPOINT_REFS_PREFIX = "refs/t3/checkpoints";

export function checkpointRefForThreadTurn(threadId: ThreadId, turnCount: number): CheckpointRef {
  return CheckpointRef.make(
    `${CHECKPOINT_REFS_PREFIX}/${Encoding.encodeBase64Url(threadId)}/turn/${turnCount}`,
  );
}

export function resolveThreadWorkspaceCwd(input: {
  readonly thread: {
    readonly projectId: ProjectId;
    readonly worktreePath: string | null;
  };
  readonly projects: ReadonlyArray<{
    readonly id: ProjectId;
    readonly workspaceRoot: string;
  }>;
}): string | undefined {
  const worktreeCwd = input.thread.worktreePath ?? undefined;
  if (worktreeCwd) {
    return worktreeCwd;
  }

  return input.projects.find((project) => project.id === input.thread.projectId)?.workspaceRoot;
}

```