Typescript Quality Enforcer

TypeScript Quality Enforcer

Turn recurring TypeScript/JavaScript quality failures into evidence-backed, deterministic enforcement. Diagnose the repository first, stage adoption second, and fix the violated invariant rather than the lint message.

Trigger boundary

Use this skill for:

• auditing an existing TypeScript/JavaScript repository for type-evidence loss, unsafe assertions, broad contracts, suppressions, weak boundary parsing, and test seams;
• installing or configuring the bundled anti-slop Oxlint rules after an approved proposal;
• migrating an existing anti-slop setup without blindly replacing project-specific policy;
• reducing repeated any, unknown, unsafe dictionary, assertion, reflection, or module-mocking patterns when the goal is stronger permanent enforcement;
• tightening TypeScript compiler/lint discipline when the repository-specific migration cost is part of the decision.

Do not trigger for:

• explaining a concrete runtime failure with unknown cause—use debugging-investigator;
• upgrading TypeScript, Oxlint, a framework, runtime, or public contract as the primary task—use codebase-evolution-controller;
• a defined behavior-preserving refactor that is already chosen—use review-and-refactor-code;
• a named measured performance problem—use optimize-codebase-performance;
• broad web/mobile production readiness where TypeScript quality is only one concern—use the relevant builder;
• deciding whether the integrated release can ship—use verification-and-release.

Required inputs

Obtain or state:

1. repository root, working-tree state, and protected user work;
2. TypeScript/JavaScript source boundaries and excluded generated/vendor code;
3. package manager, manifests/lockfiles, TypeScript configuration, lint configuration, and existing lint/typecheck commands;
4. current compiler/lint baseline, known failures, and CI enforcement;
5. whether anti-slop or equivalent project-local rules already exist;
6. product/runtime compatibility constraints and public type/API boundaries;
7. whether the task is audit-only or an exact previously proposed adoption/remediation stage has been approved.

If repository evidence cannot distinguish source from generated or vendored code, stop before proposing broad enforcement.

Safety baseline

• Inspect and preserve the working tree and uncommitted user work. Never reset, clean, stash, or reformat unrelated files.
• Broad audit requests authorize inspection only. Do not install dependencies, copy the plugin, change lint/compiler configuration, or remediate files until the user approves a concrete stage.
• The bundled anti-slop runtime is third-party MIT-licensed code vendored from the pinned upstream revision documented in [references/upstream-provenance.md](references/upstream-provenance.md). Preserve its license and provenance.
• Do not overwrite an existing anti-slop/plugin directory. Compare existing content and propose migration instead.
• Never make lint pass by changing unknown to any, replacing one unsafe cast with another, adding blanket suppressions, disabling a rule, widening ignores, or weakening compiler options without an explicit evidence-backed exception.
• Do not enable every rule at error merely because the plugin contains it. First measure impact and stage adoption against the repository's contracts and test architecture.
• Do not edit generated output directly. Identify the generator and authoritative source.
• Do not infer package-manager commands or current dependency versions. Read repository metadata and verify volatile package compatibility from current primary sources before installation.

Workflow

1. Freeze the quality decision

Record:

Mode: audit | adoption proposal | approved stage execution
Repository/scope:
Protected behavior/contracts:
Generated/vendor exclusions:
Existing type/lint baseline:
CI enforcement:
Approved stage, if any:
Evidence limits/unknowns:

Keep two questions separate:

1. Which quality risks are actually present?
2. Which deterministic controls are worth adopting now?

2. Establish a read-only baseline

Inspect manifests, lockfiles, tsconfig*, lint configuration, test configuration, scripts, CI, and source layout. Run the repository's existing non-mutating lint/typecheck checks where safe.

Use the read-only heuristic inventory for a breadth-first signal pass:

python skills/typescript-quality-enforcer/scripts/typescript_quality_inventory.py . --format markdown

The helper reports compiler/lint configuration and suspicious source patterns; it does not claim that regex matches are anti-slop rule violations. Verify material candidates in source and, when available, with the actual linter.

Capture at least:

• strictness-related compiler settings and inherited config uncertainty;
• current Oxlint/ESLint/Vite+ presence and authoritative config;
• suppressions such as @ts-ignore, @ts-expect-error, lint disables, and project-specific allowlists;
• assertion/cast hotspots and broad any/unknown contracts;
• module mocking and whether real dependency seams exist;
• external input boundaries and parsing/validation strategy;
• generated code, test fixtures, and compatibility-sensitive public types.

3. Determine current enforcement state

Classify the repository as one of:

• already enforced: anti-slop or equivalent rules exist and CI runs them;
• partially enforced: Oxlint/TypeScript discipline exists but material escape hatches remain;
• unenforced but compatible: lint infrastructure appears suitable for staged anti-slop adoption;
• migration required: adopting the rules depends on a toolchain/runtime/configuration transition;
• not a fit: the repository language/tooling or constraints make this workflow inappropriate.

If anti-slop is already installed, compare the local copy and configuration with the pinned vendor baseline before recommending replacement.

4. Build the evidence ledger

Group findings by underlying invariant, not merely by rule name. Use [references/violation-remediation.md](references/violation-remediation.md).

Recommended buckets:

• assertion safety: fabricated evidence, chained casts, widen-then-assert flows, undocumented assertions;
• contract precision: broad parameters/returns, unsafe dictionaries, known-value widening;
• boundary discipline: runtime narrowing or unknown values propagated past I/O boundaries instead of parsed once;
• test architecture: module mocks standing in for missing dependency seams;
• dynamic access: reflection or generic containers that bypass useful type evidence;
• compiler/lint gaps: strictness or CI configuration that allows the same debt to recur.

For every admitted finding or cluster include:

Evidence:
Files/symbols:
Observed pattern:
Violated invariant:
User/developer risk:
Confidence: high | medium | low
False-positive/legitimate-use considerations:
Verification target:
Likely remediation owner:

Do not elevate a style preference into a quality defect.

5. Design staged enforcement

Use [references/adoption-strategy.md](references/adoption-strategy.md). Default to stages that minimize blast radius and maximize evidence:

1. assertion safety;
2. contract precision;
3. boundary discipline;
4. dynamic access and repository-specific rules;
5. test architecture;
6. compiler-option migrations where justified.

This is a starting order, not a mandate. Repository evidence may reorder or omit stages.

For each proposed stage state:

• rules/settings included;
• current estimated or measured violations;
• files/components affected;
• mechanical vs architectural remediation mix;
• expected value and recurrence prevented;
• migration effort, risk, reversibility, and verification;
• specialist handoff if the stage crosses another workflow boundary.

6. Produce the proposal and stop

The first broad run must end in one of:

• AUDITED — evidence exists but no enforcement/edit stage is justified;
• AWAITING_APPROVAL — a concrete stage is recommended;
• BLOCKED — evidence/tooling is insufficient for a safe proposal.

For AWAITING_APPROVAL, return:

1. current enforcement state;
2. evidence-backed quality findings ordered by consequence;
3. staged adoption plan;
4. recommended first stage and why it outranks alternatives;
5. exact files/configuration/dependencies expected to change;
6. verification commands/criteria;
7. explicit exclusions and no-laundering invariants.

Stop without editing.

7. Validate approval and refresh baseline

Approval must clearly accept an existing stage or named subset. Re-inspect repository state before writing. If the source, lockfile, lint config, or scope materially changed, return to proposal mode.

If the approved stage requires a toolchain/package migration rather than ordinary configuration, hand it to codebase-evolution-controller before changing versions.

8. Install the vendored runtime only when approved

When anti-slop is absent and the approved stage requires it, copy the bundled runtime with:

node skills/typescript-quality-enforcer/scripts/install.mjs

The installer copies to tools/oxlint/anti-slop/ by default and refuses to overwrite an existing destination. A repository-established tooling path may be passed as the first argument.

Then:

• inspect existing Oxlint/Vite+ configuration and merge the plugin/ignores rather than replacing configuration;
• preserve every existing ignore and add only project-local agent/vendor paths that should not be treated as application source;
• verify current compatible oxlint and @oxlint/plugins requirements from primary sources before adding/updating dependencies;
• enable only the approved rule stage;
• keep the vendored plugin itself excluded from application lint/format passes;
• preserve the bundled LICENSE and repository third-party notice.

9. Remediate by invariant, not diagnostic

For each violation:

1. identify the source of truth and intended contract;
2. determine whether the value is trusted domain data, untrusted boundary input, generated data, or test substitute;
3. replace fabricated evidence with actual evidence—precise inference, satisfies, parsing/validation, named owner types, explicit dependency seams, or direct typed access as appropriate;
4. add focused tests around the corrected boundary or contract;
5. run the approved rule(s), typecheck, and affected tests;
6. inspect the diff for laundering, suppressions, broad formatting churn, or public contract drift.

A changed diagnostic count is not success unless the violated invariant is actually repaired.

10. Escalate architectural findings

Some deterministic rules intentionally reveal work that is not mechanical:

• widespread module mocking may require dependency-seam refactoring;
• public unknown/dictionary contracts may require API/schema evolution;
• toolchain incompatibility may require a controlled migration;
• a suspicious cast implicated in an observed failure may require causal debugging;
• broad platform quality work may belong to the web/mobile builder.

Do not disguise these as lint cleanup. Produce the evidence and hand off.

11. Verify permanent enforcement

For an implemented stage verify, as applicable:

• selected anti-slop rules report zero unexplained violations in the intended scope;
• TypeScript typecheck remains green or no worse than the recorded baseline;
• focused unit/integration tests cover changed boundaries and dependency seams;
• public types/contracts remain compatible unless a separately approved migration changed them;
• CI runs the relevant lint/typecheck path so the debt cannot silently recur;
• no new blanket suppression, unsafe cast, broad ignore, or downgraded rule was introduced;
• the plugin license/provenance remains intact.

Report before/after finding counts, files changed, checks run, legitimate exceptions, and residual debt.

Output contract

Lead with AUDITED, AWAITING_APPROVAL, ENFORCED, or BLOCKED.

Include only applicable sections:

• scope and repository state;
• current compiler/lint enforcement;
• evidence-backed findings by invariant;
• anti-slop/tooling fit assessment;
• staged adoption plan;
• recommended stage and approval boundary;
• implemented remediation and configuration;
• before/after counts and verification;
• legitimate exceptions, unknowns, and residual risk;
• specialist handoff.

Handoffs

• From codebase-improvement-planner: when open-ended repository discovery identifies TypeScript type-evidence or lint discipline as the selected improvement.
• To repository-intelligence: when ownership, generated-code boundaries, or consumer blast radius are too unclear to scope enforcement.
• To review-and-refactor-code: when findings require behavior-preserving dependency seams or structural decomposition beyond the approved lint stage.
• To debugging-investigator: when a quality finding is tied to a concrete observed failure whose cause still needs proof.
• To codebase-evolution-controller: for TypeScript/Oxlint/runtime/package migrations or public contract transitions.
• To optimize-codebase-performance: when a quality pattern becomes a measured performance question rather than a type-safety question.
• To platform builders: when remediation becomes broader web/mobile production implementation.
• To verification-and-release: for the final integrated release gate.

Failure handling

• If heuristic inventory and actual linter results disagree, trust the parser/linter for rule semantics and inspect representative source manually.
• If enabling a rule produces unexpectedly broad findings, stop, classify the dominant causes, and narrow or reorder the stage rather than mass-editing.
• If an existing local anti-slop copy differs from the vendored baseline, preserve it, identify project-specific modifications, and propose a migration instead of overwriting.
• If a rule conflicts with an explicit repository contract, document the conflict and exclude or configure that rule only through a reviewed exception; do not silently weaken policy.
• If package compatibility cannot be established from current primary sources, remain BLOCKED rather than guessing versions.
• If remediation requires public behavior or data-contract change, stop the lint stage and route to the owning migration/implementation workflow.

Stop conditions

Stop in audit/proposal mode when findings are evidence-backed, stages are bounded, and the next write requires approval. Stop execution when approval is ambiguous, repository state changed materially, toolchain compatibility is unresolved, remediation would exceed the approved stage, or a specialist-owned architectural/migration/debugging decision appears. Complete as ENFORCED only when the approved stage is configured, violations are repaired or explicitly justified, focused verification passes, CI recurrence prevention is in place where requested, and provenance remains intact.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: cmdr-chara
• Source: cmdr-chara/codex-toolkit
• License: MIT

Install and usage instructions live in the source repository linked above.