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This release includes major version upgrades for @babel/cli, eslint, and jest, each introducing significant breaking changes that require developer action. The overall risk is high due to the fundamental nature of these changes, which affect project configuration, code, and runtime environments.
Top Breaking Changes
1. eslint 9.39.4 → 10.0.0 (HIGH RISK)
This upgrade finalizes the transition to the new "flat config" system. Legacy .eslintrc configuration files are no longer supported and must be migrated to eslint.config.js.
Action Required: Manually migrate your ESLint configuration from .eslintrc.js to the new eslint.config.js format. ESLint provides a migration tool (npx @eslint/migrate-config) to assist with this.
Node.js Requirement: Support for Node.js versions below 20.19.0 has been dropped.
Configuration Loading: The algorithm for locating eslint.config.js has changed, which may affect monorepos.
2. @babel/cli 7.28.6 → 8.0.0 (HIGH RISK)
Babel 8 modernizes its core, which impacts project setup and build configurations significantly. It is now ESM-only and targets modern environments by default.
Action Required: Update your Babel configuration (babel.config.js) to align with the new defaults. The most significant change is that @babel/preset-env no longer compiles code to ES5 by default.
Node.js Requirement: Babel 8 itself requires Node.js 22 or newer to run.
ESM-Only: Babel now ships as ESM packages.
Polyfills: Polyfill injection has been extracted to separate packages, and the useBuiltIns option has been removed.
3. jest 29.7.0 → 30.0.0 (MEDIUM RISK)
Jest 30 introduces several breaking changes, but many can be handled with automated tools. The primary impact is on environment compatibility and test code syntax.
Action Required: Run a codemod or use eslint-plugin-jest with its autofixer to replace removed matcher aliases (e.g., toBeCalled() becomes toHaveBeenCalled()). Snapshots will also need to be updated.
Node.js Requirement: Support for Node.js 14, 16, 19, and 21 has been dropped.
TypeScript Requirement: The minimum required TypeScript version is now 5.4.
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Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.
Snyk changed the following file(s):
packages/koa-tracer/package.jsonpackages/koa-tracer/package-lock.jsonVulnerabilities that will be fixed with an upgrade:
SNYK-JS-BRACEEXPANSION-17706650
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