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Replace ESLint and Prettier with Biome - #1440
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Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe repository replaces ESLint and Prettier with Biome. Source, test, fixture, and TypeScript configuration files receive Biome-compatible formatting, imports, lint suppressions, and equivalent syntax updates. ChangesBiome migration and repository-wide normalization
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The migration replaces the linting and formatting stack while refactoring several code paths; an unresolved accumulator edge case may mishandle a container named "proto", and a mock-specifier mismatch may leave a test unable to intercept the intended module. The PR is not fully merge-ready until these bounded correctness and test-reliability risks are fixed or explicitly accepted. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/testcontainers/src/container-runtime/auth/get-auth-config.test.ts`:
- Around line 8-12: Update the Vitest mock specifiers in the test setup to use
"node:fs" and "node:fs/promises", matching the dynamic imports used for
existsSync and readFile so those production dependencies are mocked.
In
`@packages/testcontainers/src/docker-compose-environment/docker-compose-environment.ts`:
- Around line 212-215: Update the reducer accumulator mapping started containers
by name to use an own-property-safe object, such as Object.create(null),
Object.fromEntries, or object spread, so "__proto__" is stored as a container
key without altering the prototype. Add a regression test covering a container
named "__proto__" and verifying getContainer returns that container.
In `@packages/testcontainers/src/port-forwarder/port-forwarder.ts`:
- Line 21: Remove the unused networkName constructor parameter/property from
PortForwarder and remove the corresponding fifth argument from both new
PortForwarder(...) call sites; do not expose _networkName or change the instance
API.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
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- Create a new PR with the fixes
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📒 Files selected for processing (292)
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Swaps eslint, typescript-eslint, prettier, eslint-config-prettier, eslint-plugin-prettier, prettier-plugin-organize-imports, @eslint/js and @eslint/json for a single @biomejs/biome dependency. Biome ships as a self-contained binary with no npm dependencies and uses its own parser, so it places no constraint on the TypeScript version. That removes the typescript-eslint peer range (typescript >=4.8.4 <6.1.0), which is what currently blocks TypeScript 7 and fails the grouped Dependabot updates. TypeScript itself is left at ^6.0.3 here. Linting runs Biome's recommended preset with no rules disabled. Formatting is configured to match the previous Prettier setup (120 columns, 2-space indent, es5 trailing commas), so TypeScript source formatting is unchanged apart from one expression in the gcloud module. Code changes needed to run clean at default rules: - noAccumulatingSpread: six O(n^2) reduce-with-spread accumulations replaced by Object.fromEntries / map / flatMap - useIterableCallbackReturn: forEach callbacks no longer return a value - noDoubleEquals: 7 loose comparisons tightened (none were `== null`) - noImplicitAnyLet: 4 untyped `let` declarations annotated - useImportType, useNodejsImportProtocol, useLiteralKeys and useTemplate applied mechanically - existing eslint-disable comments translated to biome-ignore Two vi.mock factories are pinned to function expressions with biome-ignore comments. Biome classifies its useArrowFunction fix as safe, but arrow functions are not constructable and both mocks are invoked with `new`; neither tsc nor the linter catches this, only the test run does. noStaticOnlyClass is suppressed per-occurrence on Wait, PullPolicy, TestContainers and PortForwarderInstance rather than disabled globally. These are public API and converting them to object literals would be a breaking change, but the rule stays enabled for new code. docs/ is excluded so the site CSS and JS are not reformatted. Dropping Prettier means .github/**/*.yml is no longer formatted, as Biome has no YAML support.
Four fixes applied by Biome's unsafe autofixes changed the generated declarations. Reverted, with per-occurrence suppressions instead. noUnusedPrivateClassMembers strips the `private` modifier from TypeScript constructor parameter properties rather than removing the member, which promotes it to a public property in the emitted .d.ts: - private readonly stoppedSeleniumContainer; (main) + readonly stoppedSeleniumContainer: object; (was here) Affected StoppedSeleniumContainer, and PortForwarder where the field was additionally renamed networkName -> _networkName. noUnusedFunctionParameters renames unused parameters with a leading underscore. On methods implementing an inherited signature that name is published, so LogWaitStrategy.waitUntilReady and CredsStore.getCredentialProviderName advertised `_boundPorts` and `_registry` to implementors. Verified by diffing `tsc --declaration` output across every package against main: the only remaining differences are import/export statements rewritten to `import type` or reordered, and 11 useless constructors removed. Each of those 11 was confirmed type-equivalent to the signature it now inherits (nine Started*Container classes against AbstractStartedContainer, SeleniumRecordingContainer against SeleniumContainer, StartupCheckStrategy against an implicit constructor).
The noAccumulatingSpread rewrite replaced
reduce((map, c) => ({ ...map, [c.getName()]: c }), {})
with a mutating `map[c.getName()] = c`. Those are not equivalent: a
computed key in an object literal defines an own property, while
assignment goes through the inherited `__proto__` setter. A compose
service named `__proto__` is a legal name, and under the assignment form
it set the accumulator's prototype instead of adding an entry, after
which getContainer("getName") returned an inherited function.
Uses Object.defineProperty to keep the O(n) accumulation while matching
the original define semantics.
Note the read side of getContainer is unchanged and still resolves
inherited keys such as "toString"; that predates this PR and is left
alone here.
The fixture apps under packages/testcontainers/fixtures are copied into container images built from node:10-alpine. Biome's useNodejsImportProtocol rewrote their requires to the node: protocol, which Node 10 does not support: Error: Cannot find module 'node:fs' The containers exited immediately on start, which surfaced as "container stopped/paused ... is not running" and "No port binding found for :8080/tcp" in the Dockerfile and buildkit suites. Confirmed by reintroducing a single node: prefix into one fixture, which reproduces the failure, and removing it, which fixes it. These files are container payloads pinned to an old runtime rather than library source, so they are excluded from Biome entirely and restored byte-for-byte to their state on main.
useNodejsImportProtocol moved the sources to node:-prefixed builtins but
left the mocks on the bare specifier, so the two sides no longer matched:
import { readFile } from "node:fs/promises";
vi.mock("fs/promises");
This works today because Vitest 4.1.10 normalises the prefix, and it was
verified to still bind (vi.isMockFunction(readFile) === true, and the
suites pass). But that normalisation is not documented as a guarantee, and
if it ever changes the mocks would silently stop applying rather than
fail, so the tests would keep passing while testing the real filesystem.
Aligns all 10 mock specifiers across 6 files to match their imports. No
behaviour change; the sources already use node: exclusively.
Main gained the InfluxDB module and a DockerContainerClient test after this branch was cut, both written against the ESLint/Prettier setup. Apply Biome's import-type fix and formatting to them, and translate the remaining eslint-disable comments to biome-ignore. Also bump Biome to the 2.5.14 the lockfile resolves to and migrate the biome.json schema reference to match.
biome ci exits 0 when only warnings are reported, and several recommended rules (noExplicitAny, useImportType, ...) are warnings by default. The ESLint setup ran with --max-warnings=0, so pass --error-on-warnings to keep CI as strict as before.
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- Prefix unused inherited parameters with _ (LogWaitStrategy, CredsStore) - Type Couchbase request bodies as RequestInit["body"] and compose errors as IDockerComposeResult instead of any - Narrow the dockerode stop error instead of typing it any - Stub Dockerode with `as unknown as` in DockerContainerClient tests - Drop never-read private fields on PortForwarder and StoppedSeleniumContainer
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Replaces
eslint,typescript-eslint,prettier,eslint-config-prettier,eslint-plugin-prettier,prettier-plugin-organize-imports,@eslint/jsand@eslint/jsonwith a single@biomejs/biomedependency.Why
Biome ships as a self-contained binary with no npm dependencies and uses its own parser, so it places no constraint on the TypeScript version. That removes the
typescript-eslintpeer range (typescript >=4.8.4 <6.1.0), which is what currently fails the grouped Dependabot updates. See #1477, wherenpm cidies withERESOLVEacross all 43 lint jobs because the group bumpstypescriptto 7.0.2.typescript-eslint cannot fix this on their side yet: TypeScript 7.0 shipped without a stable programmatic API, so #12518 was closed as not planned and the tracking issue #10940 is labelled blocked by external API until TS 7.1.
TypeScript itself is left at
^6.0.3in this PR. Bumping it is Dependabot's job once this lands. It has been checked against TS 7, see Verification.Configuration
Linting runs Biome's
recommendedpreset with no rules disabled.lint:cipasses--error-on-warnings, becausebiome ciotherwise exits 0 on warnings and several recommended rules (noExplicitAny,useImportType, ...) are warnings by default. This keeps CI as strict as the previouseslint --max-warnings=0.Formatting matches the previous Prettier setup (120 columns, 2-space indent, es5 trailing commas), so TypeScript source formatting is unchanged apart from one expression in the gcloud module.
Code changes
Reaching a clean run at default rules needed real fixes, not suppressions:
noAccumulatingSpread: six O(n²)reduce((acc, x) => ({ ...acc, ...x }), {})accumulations replaced withObject.fromEntries/map/flatMapuseIterableCallbackReturn: 7forEachcallbacks no longer implicitly return a valuenoDoubleEquals: 7 loose comparisons tightened; each was checked, none were the intentional== nullidiomnoImplicitAnyLet: 4 untypedletdeclarations annotateduseImportType,useNodejsImportProtocol,useLiteralKeys,useTemplate: applied mechanicallynoUnusedFunctionParameters,noExplicitAny,noUnusedPrivateClassMembers: existingeslint-disablecomments replaced with real fixes. Unused parameters that can't be dropped get a_prefix,anybecomes a concrete type (RequestInit["body"],IDockerComposeResult,as unknown as Dockerode), and two private fields that were never read are removedSuppressions
Two
vi.mockfactories are pinned to function expressions withbiome-ignorecomments. Biome classifies itsuseArrowFunctionfix as safe, but arrow functions are not constructable and both mocks are invoked withnew. Neithertscnor the linter catches this, only the test run does. Worth knowing for anyone doing a similar migration.noStaticOnlyClassis suppressed per-occurrence onWait,PullPolicy,TestContainersandPortForwarderInstancerather than disabled globally. The first three are public API and converting them to object literals would be a breaking change.PortForwarderInstanceis internal, but turning it into module-level state would be a refactor unrelated to this migration. The rule stays enabled for new code.noNonNullAssertionis suppressed once inSeleniumRecordingContainer.start(), wherecreateNetworkIfNeeded()has just set the network mode. The alternative is a runtime check for a case that can't happen.That leaves 7
biome-ignorecomments in total.Trade-offs
.github/**/*.ymlis no longer formatted. Biome has no YAML support, and this drops Prettier entirely. Keeping Prettier solely for workflow files is the alternative.endOfLine: autoequivalent. Biome formats to LF only, so Windows contributors withcore.autocrlf=truemay see local format noise. CI runs on Linux and is unaffected.docs/is excluded so the site CSS and JS aren't reformatted (~660 lines that Prettier never covered).tsconfig*.jsonfiles are reformatted. They sat outside Prettier's globs before and are inside Biome's scope now. That's most of the file count in this diff.Not breaking
The published
.d.tsfiles, compared betweenmainand this branch, differ only in:typemodifiers on imports (import { AbstractStartedContainer, type StartedTestContainer })StoppedSeleniumContainerthat was never readLogWaitStrategy.waitUntilReady's unusedboundPortsparameter is now_boundPorts. Parameter names are not part of a TypeScript signature's compatibility, so callers and subclasses are unaffectedVerification
v12.2.0; code added onmainsince the branch was cut (InfluxDB module,DockerContainerClienttest) brought in line with Biomebiome ci --error-on-warnings .: exit 0. Confirmed it now fails on a warning-only violation, which it did not without the flagnpm run check-compiles(TS 6): cleanvitest runforpackages/testcontainersplus kafka, redis, nats, localstack, couchbase and selenium: 492 passed. Two failures (a Docker Hub pull error and a Couchbase connection error) passed on reruncontainer-runtime,port-forwarder,wait-strategiesanddocker-compose-environment(261 passed), couchbase (9 passed) and selenium (6 passed)check-compilesis clean and still reports a deliberately added type error.jsand.d.tsis byte-identical to the TS 6 buildFollow-up
Once this lands, Dependabot's rebase of #1477 should let the grouped update through:
typescript-eslintis gone, so nothing pins TypeScript below 7.