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chore: add deprecation warning for eslint v9 #3067

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chore: add deprecation warning for eslint v9 #3067

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6 changes: 6 additions & 0 deletions src/cli/format/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,12 @@ export default function (program: Command): void {
.description("Lint and format this Pepr module")
.option("-v, --validate-only", "Do not modify files, only validate formatting.")
.action(async opts => {
Log.warn(
"DEPRECATION NOTICE: Pepr v1.1.6 is the last release that supports ESLint v9. " +
"The next release will upgrade to ESLint v10, which includes breaking changes. " +
"Review the ESLint v10 migration guide before upgrading Pepr: <ADD_URL_HERE>",
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@greptile-apps greptile-apps Bot Apr 22, 2026

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P1 Placeholder URL left in warning message

The migration guide URL is still <ADD_URL_HERE>, which will be shown verbatim to every user who runs pepr format. This should be replaced with the actual ESLint v10 migration guide URL before merging (e.g., https://eslint.org/docs/latest/use/migrate-to-10.0.0).

Suggested change
"Review the ESLint v10 migration guide before upgrading Pepr: <ADD_URL_HERE>",
"Review the ESLint v10 migration guide before upgrading Pepr: https://eslint.org/docs/latest/use/migrate-to-10.0.0",

);

const success = await peprFormat(opts.validateOnly);

if (success) {
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