Compatibility with ESLint 10

[kachkaev]

👋 folks! Just tried upgrading a project from v9 to v10.0.0-rc.2 and caught this error:

TypeError: Error while loading rule 'import/no-default-export': Cannot use 'in' operator to search for 'sourceType' in undefined
Occurred while linting /path/to/project/path/to/file.ts
    at sourceType (/node_modules/eslint-plugin-import/lib/core/sourceType.js:8:63)
    at Object.create (/node_modules/eslint-plugin-import/lib/rules/no-default-export.js:19:39)
    at createRuleListeners (/node_modules/eslint/lib/linter/linter.js:497:15)
    at /node_modules/eslint/lib/linter/linter.js:623:7
    at Array.forEach (<anonymous>)
    at runRules (/node_modules/eslint/lib/linter/linter.js:557:31)
    at #flatVerifyWithoutProcessors (/node_modules/eslint/lib/linter/linter.js:1248:4)
    at Linter._verifyWithFlatConfigArrayAndWithoutProcessors (/node_modules/eslint/lib/linter/linter.js:1333:43)
    at Linter._verifyWithFlatConfigArray (/node_modules/eslint/lib/linter/linter.js:1400:15)
    at Linter.verify (/node_modules/eslint/lib/linter/linter.js:861:9)
    at Linter.verifyAndFix (/node_modules/eslint/lib/linter/linter.js:1518:20)
    at verifyText (/node_modules/eslint/lib/eslint/eslint-helpers.js:1179:45)
    at readAndVerifyFile (/node_modules/eslint/lib/eslint/eslint-helpers.js:1320:10)
Failed

Relevant code:

eslint-plugin-import/src/core/sourceType.js

Line 6 in eb6a828

if ('sourceType' in context.parserOptions) {

Happy to continue the investigation if needed.

[ljharb]

We're not yet compatible with eslint 10, so it's expected there will be failures. The peer dep range will allow it when we are.

[kachkaev]

ESLint v10.0.0 is out 🚀
https://eslint.org/blog/2026/02/eslint-v10.0.0-released/

[palfrey]

I'm hitting a similar issue

TypeError: sourceCode.getTokenOrCommentBefore is not a function
Occurred while linting /home/palfrey/src/freshet/freshet/frontend/eslint.config.ts:3
Rule: "import/order"

@kachkaev Are you working on a PR to fix the issues, or should I have a look at this?

[kachkaev]

👋 @palfrey

I haven’t had a chance to explore potential fix, feel free to!

[palfrey]

I started having a go at this, but this will be hard. So, you hit

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Error while loading rule 'import/no-unused-modules': Package subpath './lib/util/glob-utils' is not defined by "exports" in /home/palfrey/src/eslint-plugin-import/node_modules/eslint/package.json
Occurred while linting /home/palfrey/src/eslint-plugin-import/tests/files/just-json-files/invalid.json

which turns out to be because FileEnumerator got removed entirely in eslint/eslint#20037 and I think we've also got problems related to #3079 as well. This will probably need an entirely new way to do file enumeration with the new flat config.

[ljharb]

We already need an entirely new way to do file enumeration for eslint 9, yes.

[NishargShah]

ESLint 10 released https://eslint.org/blog/2026/02/eslint-v10.0.0-released

[inoplanetyanya]

context.getSourceCode is not a function :(