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TemplateCompiler `cannot read property 'visitor' of undefined`

See original GitHub issue

I’m currently diagnosing an issue that cropped up with the recent ember-canary/ember-beta’s (todays), it may not be a bug with Ember.js itself, but rather some other part of our default system that is now getting tripped up.

Stack Strace:

TypeError: Cannot read property 'visitor' of undefined
    at preprocess (/private/var/folders/9n/_xy74rdd4m3063fr5kqdl5vc000mw4/T/embroider/cb03bb/packages/router/node_modules/ember-source/vendor/ember/ember-template-compiler.js:12246:42)
    at normalize (/private/var/folders/9n/_xy74rdd4m3063fr5kqdl5vc000mw4/T/embroider/cb03bb/packages/router/node_modules/ember-source/vendor/ember/ember-template-compiler.js:12906:15)
    at precompileJSON (/private/var/folders/9n/_xy74rdd4m3063fr5kqdl5vc000mw4/T/embroider/cb03bb/packages/router/node_modules/ember-source/vendor/ember/ember-template-compiler.js:5402:47)
    at precompile (/private/var/folders/9n/_xy74rdd4m3063fr5kqdl5vc000mw4/T/embroider/cb03bb/packages/router/node_modules/ember-source/vendor/ember/ember-template-compiler.js:5435:31)
    at Object.precompile (/private/var/folders/9n/_xy74rdd4m3063fr5kqdl5vc000mw4/T/embroider/cb03bb/packages/router/node_modules/ember-source/vendor/ember/ember-template-compiler.js:19197:37)
    at NodeTemplateCompiler.precompile (/Users/spenner/src/embroider-build/embroider/packages/core/src/template-compiler-common.js:71:36)
    at NodeTemplateCompiler.compile (/Users/spenner/src/embroider-build/embroider/packages/core/src/template-compiler-common.js:87:47)
    at NodeTemplateCompiler.compile (/Users/spenner/src/embroider-build/embroider/packages/core/src/template-compiler-node.js:23:25)
    at Object.hbsLoader (/Users/spenner/src/embroider-build/embroider/packages/hbs-loader/src/index.js:9:16)
    at LOADER_EXECUTION (/Users/spenner/src/embroider-build/embroider/node_modules/loader-runner/lib/LoaderRunner.js:132:14)
    ```

Issue Analytics

State:
Created 2 years ago
Reactions:1
Comments:15 (6 by maintainers)

Top GitHub Comments

3reactions

stefanpennercommented, Aug 23, 2021

Ok. Solution: Ensure your template compiler plugins follow the new form only.

In my case, ember-cli-template-lint’s plugins where simply incompatible with the new plugin form introduced by https://github.com/glimmerjs/glimmer-vm/commit/28652d4ea214f1c7bf0251d4b4b23853d9f0a787, and required upgrading to ember-template-lint. Given that ember-cli-template-lint is deprecated, in this scenario it is likely perfectly reasonable solution.

That being said, the debugging on this is quite sub-optimal, and I although I hope folks running into this problem at helped by this issue, i suspect (assuming the above is a reasonable change) that better detection of the failure mode could go a long way. Specifically https://github.com/glimmerjs/glimmer-vm/blob/ef92c497c3d921af22b38a54eac1445c204c3370/packages/%40glimmer/syntax/lib/parser/tokenizer-event-handlers.ts#L447 could detect a return value without { visitor() { } } and provide throw an actionable error

2reactions

loganrosencommented, Jan 19, 2022

@JenLyndle The issue with ember-cp-validations is most likely due to the deprecation that was cleaned up in #19429 for disallowing legacy class-based AST plugins. It looks like @Turbo87 fixed this issue in qonto/ember-cp-validations#3, but that’s a fork of the addon that doesn’t appear to be published to NPM. The original addon hasn’t been touched since April 2021.

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