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Description
Before You File a Bug Report Please Confirm You Have Done The Following...
- I'm usingeslint-plugin-vue.
- I'm sure the problem is a parser problem. (If you are not sure, search for the issue ineslint-plugin-vue repo and open the issue ineslint-plugin-vue repo if there is no solution.
- I have tried restarting my IDE and the issue persists.
- I have updated to the latest version of the packages.
What version of ESLint are you using?
9.12.0
What version ofeslint-plugin-vue andvue-eslint-parser are you using?
- vue-eslint-parser@9.28.0
- eslint-plugin-vue@9.4.3
What did you do?
Use Flat Config in ESLint 9 with the default configuration.
What did you expect to happen?
No parsing error.
What actually happened?
0:0 error Parsing error: Invalid ecmaVersion
(If theespree parser is used for an SFC)
Link to Minimal Reproducible Example
The issue report is atvuejs/eslint-config-typescript#87
And a stable reproduction can be found athttps://github.com/vuejs/eslint-config-typescript/tree/8954ae82336dc53fecc656bb613af1bd42c808cb/test/fixtures/with-older-espree
Additional comments
I explained the fix at my downstream config here:
https://github.com/vuejs/eslint-config-typescript/blob/aae95d60eaae711de8eccd55ee33ffd799cd188a/src/index.ts#L84-L91
But I think there's a bug invue-eslint-parser too:
According tohttps://github.com/vuejs/vue-eslint-parser/blob/b0e0ccc6d302bb40c5cb496528536bd355ee5151/src/script/index.ts#L569C10-L603
Theespree in the user project takes precedence over the others.
However, in
vue-eslint-parser/src/common/espree.ts
Lines 96 to 98 inb0e0ccc
| if(parserOptions.ecmaVersion==="latest"){ | |
| returnnormalizeEcmaVersion(getLatestEcmaVersion(getNewestEspree())) | |
| } |
only the newest espree version is used to determine the latest
ecmaVersion.In the issue report above, as ESLint 9 now depends onespree 10.x, the latestecmaVersion is2025, but the project loads theespree 9.x depended byvue-eslint-parser, which doesn't recognize that version, thus the error.
By the way, if I understand correctly, as ofespree 8.0.0,ecmaVersion: 'latest' is supported, sovue-eslint-parser doesn't have to normalize the version string before passing it along:
eslint/js@b068cea
ThegetEcmaVersionIfUseEspree can be removed entirely.