vuejs / vuejs/devtools

Console error: prepare.js:1 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'type')

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Dominant language
TypeScript
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Description

Console errors originating from the Vue.js devtools beta extension.
Version: 7.0.0 beta 12

Let me know what other debug info you would like.

prepare.js:1 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'type')
    at Is (prepare.js:1:49734)
    at At (prepare.js:1:52982)
    at mn (prepare.js:1:53166)
    at prepare.js:1:59930
    at prepare.js:1:63865
    at Array.map (<anonymous>)
    at prepare.js:1:63858
    at Et.callHookWith (prepare.js:1:35597)
    at prepare.js:1:63815
    at new Promise (<anonymous>)
    at Object.getInspectorState (prepare.js:1:63797)
    at Proxy.getInspectorState (VM278279 user-app.js:71:73711)
    at b (VM278279 user-app.js:71:49932)
    at t (VM278279 user-app.js:71:64182)

Chrome Devtools points to the following section of code in prepare.js, specifically the line o = t.type.props;

function Is(t) {
        let e = []
          , o = t.type.props;
        for (let n in t.props) {
            let r = o ? o[n] : null
              , s = so(n);
              ......code continues......

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the error with the Vue.js devtools beta extension version 7.0.0 beta 12 and inspect the getInspectorState call in prepare.js. Trace the Is function around the reported line o = t.type.props;; done means the reported console error no longer occurs during inspector-state retrieval.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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