error: Unsupported lockfile version '4'.

[hastebrot]

Version: Deno 1.46.0

It seems deno lint (and other deno subcommands) does not support lockfile version 4 or ignores DENO_FUTURE=1.

Lockfile version 4 was introduced with #25059.

❯ deno task main
Task main DENO_FUTURE=1 deno run main.ts

❯ deno task lint
error: Unsupported lockfile version '4'. Try upgrading Deno or recreating the lockfile at '[REDACTED]/deno.lock'.

deno.jsonc:

{
  "imports": {
    "nanoid": "npm:nanoid@5.0.7"
  },
  "tasks": {
    "main": "DENO_FUTURE=1 deno run main.ts",
    "lint": "DENO_FUTURE=1 deno lint"
  }
}

main.ts:

import { nanoid } from "nanoid";
nanoid();

[lucacasonato]

You have to run deno task lint and friends with DENO_FUTURE=1. Lockfile 4 is only supported with DENO_FUTURE=1.

[hastebrot]

Ahh thanks, now I understand. deno task accesses the lockfile and needs DENO_FUTURE=1.

[marcomow]

Is there a way to set DENO_FUTURE=1 flag without having to specify it every time a command is run? I have it set up in the .env file, but it's not being picked up

[lucacasonato]

You can upgrade to the latest 2.0-rc (deno upgrade rc). It has future enabled by default