Typescript Import Problem after updating Deno

Question

I recently update deno from v1.3.0 to v1.4.0. Before updating, my code doesn't have any problem, but after that i have this error:

error: TS1205 [ERROR]: Re-exporting a type when the '--isolatedModules' flag is provided requires using 'export type'.
  LevelName,
  ~~~~~~~~~
    at https://deno.land/x/branch@0.0.2/deps.ts:8:3

TS1205 [ERROR]: Re-exporting a type when the '--isolatedModules' flag is provided requires using 'export type'.
export { LogConfig, setup, prefix } from "./branch.ts";
         ~~~~~~~~~
    at https://deno.land/x/branch@0.0.2/mod.ts:3:10

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { WatcherConfig } from "./watcher.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/config.ts:14:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { RunnerConfig } from "./runner.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/config.ts:15:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { Args } from "./args.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/config.ts:18:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { Template } from "./templates.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/config.ts:19:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { Denon, DenonEvent } from "../denon.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/daemon.ts:5:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { CompleteDenonConfig } from "./config.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/daemon.ts:6:1

TS1371 [ERROR]: This import is never used as a value and must use 'import type' because the 'importsNotUsedAsValues' is set to 'error'.
import { ScriptOptions } from "./scripts.ts";
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    at https://deno.land/x/denon@2.3.3/src/daemon.ts:7:1

I found a page that fix this problem, but this error looks like it's coming from third party library. I also use Denon to run the script. Here is my imported package:

import { Application } from "https://deno.land/x/oak/mod.ts";
import { oakCors } from "https://deno.land/x/cors/mod.ts";
import { Router } from "https://deno.land/x/oak/mod.ts";
import { RouterContext } from "https://deno.land/x/oak/mod.ts";
import * as bcrypt from "https://deno.land/x/bcrypt/mod.ts";
import { SmtpClient } from "https://deno.land/x/smtp/mod.ts";
import { MongoClient } from "https://deno.land/x/mongo@v0.11.1/mod.ts";

And this is my denon.json:

{
  "$schema": "https://deno.land/x/denon/schema.json",
  "scripts": {
    "start": {
      "cmd": "deno run --unstable server.ts",
      "allow": [
        "net",
        "write",
        "read",
        "plugin"
      ]
    }
  }
}

Is there a way to fix this? or a way to downgrade Deno?

Which OS you are working on? – DevLoverUmar Sep 14 '20 at 12:05 — DevLoverUmar, Sep 14 '20 at 12:05
I'm working with Windows – BookShell527 Sep 15 '20 at 01:56 — BookShell527, Sep 15 '20 at 01:56
downgrade deno version to 1.3.3 – Vicky Gonsalves Sep 15 '20 at 10:17 — Vicky Gonsalves, Sep 15 '20 at 10:17

score 7 · Answer 1 · answered Oct 10 '20 at 13:44

7

Setting tsconfig like this will solve the problem

{
  "compilerOptions": {
    "importsNotUsedAsValues": "remove",
    "isolatedModules": false,
  }
}

answered Oct 10 '20 at 13:44

GGICE

71
1

score 6 · Answer 2 · answered Sep 14 '20 at 16:04

There was an unstable feature added in Deno v1.4.0. https://github.com/denoland/deno/pull/7413. A similar issue was here https://github.com/Jozty/Fae/issues/32 This will be fixed by the library writers or you can raise PR with a fix. A temporary fix is to downgrade Deno to v1.3.0

score 3 · Answer 3 · answered Dec 30 '20 at 05:28

3

Or you could just do import type instead of just import where necessary.

answered Dec 30 '20 at 05:28

Jonathan

3,893
5
46
77

DevLoverUmar · Answer 4 · 2020-09-16T15:56:54.870

2

As you asked, if you want to downgrade, you can do as

With Shell:

curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.3.0

With Scoop:

scoop install deno@1.3.0

Or you can check for a different environment here.

edited Sep 16 '20 at 15:56

answered Sep 14 '20 at 12:11

DevLoverUmar

11,809
11
68
98

Jack_Modesta · Answer 5 · 2020-09-21T13:33:42.943

2

The DevLoverUmar's solution to downgrade did'nt work for me, but this one did :

`deno upgrade --version 1.3.0`

edited Sep 21 '20 at 13:33

answered Sep 18 '20 at 08:37

Jack_Modesta

101
7

score 1 · Answer 6 · answered Nov 22 '20 at 17:59

1

The TS1205 "Re-exporting a type..." check is now included in Deno 1.5 by default.

This section of the release notes has more instructions on how to update affected code or turn it off.

answered Nov 22 '20 at 17:59

grunet

311
2
9

Typescript Import Problem after updating Deno

6 Answers6

deno upgrade --version 1.3.0

`deno upgrade --version 1.3.0`