Replace ESLint and Prettier with Biome - #1440
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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.
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WalkthroughThe 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. Poem
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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.
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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.
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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.
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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 #1439, wherenpm cidies withERESOLVEacross all 43 lint jobs.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.Configuration
Linting runs Biome's
recommendedpreset with no rules disabled. 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.biome cion the whole repo takes 0.6s, against 4.1s for the previouseslintrun.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 mechanicallyeslint-disablecomments translated tobiome-ignore(two became unnecessary)Suppressions
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. These are public API and converting them to object literals would be a breaking change; the rule stays enabled for new code.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.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.Verification
biome ci .— exit 0tsc -b --forceacrosspackages/testcontainersand every module — cleanFollow-up
Once this lands, rebasing #1439 should let the grouped update through:
typescript-eslintis gone, so nothing pins TypeScript below 7.