Setting noErrorTruncation to false truncates inferred type of variables/functions; which are not errors

TypeScript Version: 3.0.1

Search Terms: noErrorTruncation

In TS 2.9, if noErrorTruncation is unset, or set to false, hovering the cursor over an identifier for type inference in VS code would bring up a tooltip with the inferred type.

In TS 3.0, if noErrorTruncation is unset, or set to false, the tooltip with the inferred type will be truncated with ellipsis.

Code

TS 2.9, with noErrorTruncation : false

    /*snip*/
    __canAccept: {
        page?: string | number | null | undefined;
        itemsPerPage?: string | number | null | undefined;
    };
}

TS 3.0 with noErrorTruncation : false

    /*snip*/
    __canAccept: {
        ...;
    };
}

Expected behavior:

noErrorTruncation is about truncating errors.

The tooltips displaying inferred types aren’t errors, and should not be affected by this flag.

Actual behavior:

noErrorTruncation affects tooltips displaying inferred types.

---

If anyone else is having this problem, just go to your tsconfig.json, add the following line,

"noErrorTruncation": true,

and restart VS code (or your editor of choice)

[Hati-]

Having this problem as well. Investigating and debugging this issue led me to find this being introduced in merge https://github.com/microsoft/TypeScript/pull/24258.

Typescript starts truncating the output when it reaches the default hard-limit of 160 * 10 characters to prevent the server from hanging too long, even with "noErrorTruncation": true set. There’s currently no option for VS Code to disable it from the looks of it: https://github.com/microsoft/TypeScript/blob/57e2fe0462bb897e581aa489f1d6040db559d82b/src/services/utilities.ts#L1993

For people using VS Code, a quick fix would be opening <Microsoft VS Code install folder>/resources/app/extensions/node_modules/typescript/lib/tsserver.js and change ts.defaultMaximumTruncationLength = 160 at around line 12797 to something higher like ts.defaultMaximumTruncationLength = 800.

[Ciantic]

It’s not just CI, it’s usability problem. I actually like browsing (and copying) the type from the hover tip in the VSCode, and when it gets truncated it’s pretty much useless.

// from https://developer.twitter.com/en/docs/tweets/data-dictionary/overview/intro-to-tweet-json
let foo = {
  "text": "My added comments to this Tweet ---> https:\/\/t.co\/LinkToTweet",
  "user": {
    "screen_name": "TweetQuoter"
  },
  "quoted_status": {
    "text": "original message",
    "user": {
      "screen_name": "OriginalTweeter"
    },
    "place": {      
    },
    "entities": {      
    },
    "extended_entities": {      
    }
  },
  "place": {    
  },
    "entities": {
      "hashtags": [

      ],
      "urls": [
        {
          "url": "https://t.co/W1FqVrsjQk",
          "expanded_url": "https://twittercommunity.com/t/rt-with-comment-aka-quote-tweets-now-may-have-media-attached-across-twitter-apis/125539",
          "display_url": "twittercommunity.com/t/rt-with-comm…",
          "unwound": {
            "url": "https://twittercommunity.com/t/rt-with-comment-aka-quote-tweets-now-may-have-media-attached-across-twitter-apis/125539",
            "status": 200,
            "title": "RT with comment, aka Quote Tweets, now may have media attached across Twitter APIs",
            "description": "Today we’re announcing a new feature that allows userspeople on Twitter to add a GIF, video, or photo to their Retweet with comments, aka Quote Tweets. Developers will start to see additional media metadata included in the payload for Quote Tweets. Quote Tweets with media will be rendered very similarly to Tweets with media across our APIs. This rendering is an addition to the existing media field, so this should not be a breaking change for application owners, if they are already ingesting med..."
          },
          "indices": [
            162,
            185
          ]
        },
        {
          "url": "https://t.co/lXs26mCkIl",
          "expanded_url": "https://twitter.com/TwitterSupport/status/1125479034513645569",
          "display_url": "twitter.com/TwitterSupport…",
          "indices": [
            186,
            209
          ]
        }
      ],
      "user_mentions": [

      ],
      "symbols": [

      ],
      "media": [
        {
          "id": 1125490782532657153,
          "id_str": "1125490782532657153",
          "indices": [
            210,
            233
          ],
          "media_url": "http://pbs.twimg.com/tweet_video_thumb/D56L51LV4AEEC8-.jpg",
          "media_url_https": "https://pbs.twimg.com/tweet_video_thumb/D56L51LV4AEEC8-.jpg",
          "url": "https://t.co/T9MBCHZWcD",
          "display_url": "pic.twitter.com/T9MBCHZWcD",
          "expanded_url": "https://twitter.com/TwitterDev/status/1125490788736032770/photo/1",
          "type": "animated_gif",
          "video_info": {
            "aspect_ratio": [
              101,
              165
            ],
            "variants": [
              {
                "bitrate": 0,
                "content_type": "video/mp4",
                "url": "https://video.twimg.com/tweet_video/D56L51LV4AEEC8-.mp4"
              }
            ]
          },
          "sizes": {
            "thumb": {
              "w": 150,
              "h": 150,
              "resize": "crop"
            },
            "small": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            },
            "large": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            },
            "medium": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            }
          }
        }
      ]
    },
    "extended_entities": {
      "media": [
        {
          "id": 1125490782532657153,
          "id_str": "1125490782532657153",
          "indices": [
            210,
            233
          ],
          "media_url": "http://pbs.twimg.com/tweet_video_thumb/D56L51LV4AEEC8-.jpg",
          "media_url_https": "https://pbs.twimg.com/tweet_video_thumb/D56L51LV4AEEC8-.jpg",
          "url": "https://t.co/T9MBCHZWcD",
          "display_url": "pic.twitter.com/T9MBCHZWcD",
          "expanded_url": "https://twitter.com/TwitterDev/status/1125490788736032770/photo/1",
          "type": "animated_gif",
          "video_info": {
            "aspect_ratio": [
              101,
              165
            ],
            "variants": [
              {
                "bitrate": 0,
                "content_type": "video/mp4",
                "url": "https://video.twimg.com/tweet_video/D56L51LV4AEEC8-.mp4"
              }
            ]
          },
          "sizes": {
            "thumb": {
              "w": 150,
              "h": 150,
              "resize": "crop"
            },
            "small": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            },
            "large": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            },
            "medium": {
              "w": 202,
              "h": 330,
              "resize": "fit"
            }
          }
        }
      ]
    }
  };