chore: migrate to ESLint v9 and Flat Config #1753
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Summary of ChangesHello @taeold, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly updates the project's linting infrastructure by migrating to ESLint v9 and its Flat Config system. This modernization effort replaces the traditional Highlights
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This pull request successfully migrates the project to ESLint v9 and its new flat configuration format. The updates to dependencies and configuration files are well-executed. I've found a couple of areas for improvement. One is a minor simplification in the new eslint.config.js file. The other is a critical issue in one of the test files, where a refactoring to fix a lint error seems to have introduced a runtime error. Please see my detailed comments below.
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* BREAKING: Upgrade TypeScript to v5.9.3 (#1746) Upgrades from TypeScript v4.3.5 to v5.9.3. All tests pass successfully. * BREAKING: Drop Node.js 14/16 support, require Node.js >=18 (#1747) * BREAKING: Drop Node.js 14/16 support, require Node.js >=18 - Update package.json engines to require Node.js >=18.0.0 - Upgrade @types/node from v14 to v18 - Update TypeScript target from ES2019 to ES2022 - Add useDefineForClassFields: false for backward compatibility - Update CI/CD workflows to test Node.js 18, 20, 22, and 24 - Set default CI/CD Node.js version to 24 - Update integration test documentation * BREAKING: remove functions.config() implementation (#1748) Replace functions.config() implementation with an error that provides clear migration guidance to the params module. This removes the deprecated API as planned for the next major release while helping developers migrate. The error message directs users to: https://firebase.google.com/docs/functions/config-env#migrate-config * chore: migrate to ESLint v9 and Flat Config (#1753) Upgraded eslint to v9 and replaced the legacy .eslintrc.js with the new eslint.config.js format. Applied minor fixes to 4 files (renaming unused catch variables to _e and one small refactor) to satisfy slightly stricter baseline rules from updated plugins. Mostly doing this due to our upgrade in TS to latest v5 version which the old versions of eslint ts plugins no longer support. * chore: enable esModuleInterop (#1751) * feat: add async error handling to onRequest (#1755) BREAKING CHANGE: Unhandled errors in async onRequest handlers now immediately return a 500 Internal Server Error instead of hanging until timeout. This may affect clients relying on 504 Gateway Timeout for retry logic. * BREAKING: Break TS build that uses functions.config() (#1757) Type out `functions.config()` API. Use of `functions.config()` API should now cause a BUILD error at compile time. ```ts import * as functions from "firebase-functions"; import {onRequest} from "firebase-functions/https"; import * as logger from "firebase-functions/logger"; const cfg = functions.config() export const helloWorld = onRequest((request, response) => { logger.info("Hello logs!", cfg); response.send("Hello from Firebase!"); }); ``` ```bash $ npm run build > build > tsc src/index.ts:5:23 - error TS2349: This expression is not callable. Type 'never' has no call signatures. 5 const cfg = functions.config() ~~~~~~ Found 1 error in src/index.ts:5 ``` * Add Firebase Data Connect v2 support (#1727) * Add Firebase Data Connect v2 support * Export dataconnect * Fix export * Rename Extract to VarName, since Extract is a built in type * Include auth context in event payload * Stronger typing for data connect params * Fix formatting and address comments * Apply another suggestion * Add region and fix bug in which event.service, event.connector, event.operation gets populated * Remove locations/... segment * Address comments * Fix linter * feat: enable ESM support via dual-publishing (#1750) - Configure tsdown to build both CJS and ESM outputs. - Update package.json exports to support both 'require' and 'import'. - Fix type hygiene issues by using explicit 'export type'. - Update protos/update.sh to generate ESM version of compiledFirestore and fix its imports for Node.js compatibility. - Configure build aliases to handle relative paths to protos correctly in both CJS and ESM builds. - Add packaging integration test to CI. ~Note: I enabled `esModuleInterop` in tsconfig.release.json to support default imports from CommonJS modules (like cors), which is required for proper ESM interop. This caused some chain-effect that required updating several unit tests and source files to use default imports for other CJS dependencies (e.g., fs, nock, jsonwebtoken) to align with the new compiler configuration.~ Fixed in #1751. * lock down permission per GitHub alert. * update lint rule to enforce prettier rules. * chore: update CHANGELOG for v7.0.0 * format. --------- Co-authored-by: Lisa Jian <ljian997@gmail.com>
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Upgraded eslint to v9 and replaced the legacy
.eslintrc.jswith the neweslint.config.jsformat.Applied minor fixes to 4 files (renaming unused catch variables to _e and one small refactor) to satisfy slightly stricter baseline rules from updated plugins.
Mostly doing this due to our upgrade in TS to latest v5 version which the old versions of eslint ts plugins no longer support.