AI Slop Code Risk Monitor

zloirock/core-js

Name: zloirock/core-js — JavaScript Code Quality & Security Review | AI Slop Code Risk Monitor
Creator: AI Slop Code Risk Monitor

Adjusted legacy signal; badge bands: 25 / 50 / 75 (different from dashboard bands).

Standard Library

0.2 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for zloirock/core-js, a JavaScript project with 25,524 GitHub stars. SynthScan examined 165,302 lines of code across 4293 source files, recording 40 pattern matches distributed across 2 syntactic categories. The legacy adjusted pattern signal is 0.2 (Low pattern signal); it is not an authorship estimate.

Use the findings to ask whether maintainers can explain intent, verify dependencies, simplify unnecessary scaffolding, and focus review effort. Risk Payload v1 adds ownership, supply-chain, over-engineering, and review-effort vectors when available. These are prompts for human verification, not probabilities, security findings, or measured maintenance costs.

0.2

Adjusted Signal

0.2

Raw Pattern Score

100%

Time Factor

2026-10-31

Last Push

25.5K

Stars

JavaScript

Language

165.3K

Lines of Code

4.3K

Files

Pattern Hits

2026-10-31

Scan Date

0.00

HC Hit Rate

Risk Review · Payload v1

Use each vector to guide manual verification of the underlying findings.

Payload schema: 1.0.0 · Engine: 2.0.0 · Scoring: heuristic-density-v1 · Scan date: 2026-10-31.

Cognitive Ownership Risk 1.2/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 40 finding(s).

Hallucinated Dependency & Supply Chain Risk 0.0/100 · LOW

Are imports declared and package/API names verified? 0 finding(s).

Agent Over-Engineering Ratio 0.7/100 · LOW

Are wrappers, guards, and repeated structures necessary? 22 finding(s).

PR Review Velocity Impact 1.2/100 · LOW

Which changes need focused human review? 40 finding(s).

What These Metrics Mean

Adjusted Signal: Legacy pattern score normalized per 1,000 scanned lines and multiplied by the repository-level time factor. It is not an estimate of AI authorship.
Raw Pattern Score: Sum of severity- and context-weighted pattern findings before applying the time factor.
Time Factor: A coarse multiplier based on repository last-push metadata. It does not identify when individual code was written.
Pattern Hits: Count of configured pattern findings. Review each location and surrounding code before acting.
HC Hit Rate: High- and critical-severity findings per scanned file. Severity is a configured detector weight, not proof of a vulnerability or authorship.
Lines / Files: Scan coverage denominators used by the legacy normalized score.

Pattern-Signal History

This chart tracks the legacy adjusted pattern score across scan runs. Changes can reflect source changes, scan coverage, or detector/scoring versions; they do not measure AI adoption or prove that a team refactored code. Compare runs only when their scoring versions are compatible. The dashed line tracks the raw pattern-hit count.

Severity Breakdown

Groups findings by configured severity weight. Severity is not a confidence estimate, security rating, or proof that a package is missing. Verify imports against the project's manifests and inspect each finding in its local design context.

CRITICAL 0HIGH 0MEDIUM 0LOW 40

Directory Score Breakdown

This horizontal bar chart shows where configured pattern scores accumulate across directories. Treat the bars as locations to inspect, not as evidence of authorship or code quality. Use the file-level findings to decide whether a directory needs a focused ownership, dependency, complexity, or review check.

Pattern Findings

The scanner identified 40 distinct pattern matches across 2 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a detector match to inspect in context. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the configured finding weight (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — legacy comment-context matches receive a ×1.5 score weight. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier under the legacy scoring model.

Hyper-Verbose Identifiers22 hits · 22 pts

Severity	File	Line	Snippet	Context
LOW	deno/corejs/index.js	6634	getOrInsert: function getOrInsert(key, value) {	CODE
LOW	deno/corejs/index.js	6660	getOrInsertComputed: function getOrInsertComputed(key, callbackfn) {	CODE
LOW	deno/corejs/index.js	11003	function throwsOnLengthTrackingView() {	CODE
LOW	deno/corejs/index.js	11171	getOrInsert: function getOrInsert(key, value) {	CODE
LOW	deno/corejs/index.js	11231	getOrInsertComputed: function getOrInsertComputed(key, callbackfn) {	CODE
LOW	website/src/js/main.js	171	function highlightActiveDocsMenuItem() {	CODE
LOW	website/src/js/main.js	187	function openFirstCollapsibleMenuItem() {	CODE
LOW	tests/compat/tests.js	228	function createStringHTMLMethodTest(METHOD_NAME) {	CODE
LOW	tests/compat/tests.js	235	function createStringTrimMethodTest(METHOD_NAME) {	CODE
LOW	tests/compat/tests.js	259	function createSetLikeWithInfinitySize(size) {	CODE
LOW	tests/compat/tests.js	298	function createSetMethodTestShouldGetKeysBeforeCloning(METHOD_NAME) {	CODE
LOW	tests/compat/tests.js	343	function checkIteratorClosingOnEarlyError(METHOD_NAME, ExpectedError) {	CODE
LOW	tests/compat/tests.js	360	function iteratorHelperThrowsErrorOnInvalidIterator(methodName, argument) {	CODE
LOW	tests/compat/tests.js	2326	function checkNewErrorsCloningSemantic(structuredCloneImplementation) {	CODE
LOW	…ore-js-compat/get-modules-list-for-target-version.d.ts	3	declare function getModulesListForTargetVersion(version: TargetVersion): readonly ModuleName[];	CODE
LOW	packages/core-js-compat/helpers.js	34	function filterOutStabilizedProposals(modules) {	CODE
LOW	…/core-js/modules/es.weak-map.get-or-insert-computed.js	27	getOrInsertComputed: function getOrInsertComputed(key, callbackfn) {	CODE
LOW	packages/core-js/modules/es.weak-map.get-or-insert.js	13	getOrInsert: function getOrInsert(key, value) {	CODE
LOW	…kages/core-js/modules/es.map.get-or-insert-computed.js	14	getOrInsertComputed: function getOrInsertComputed(key, callbackfn) {	CODE
LOW	packages/core-js/modules/es.uint8-array.set-from-hex.js	11	function throwsOnLengthTrackingView() {	CODE
LOW	…e-js/modules/es.object.get-own-property-descriptors.js	12	getOwnPropertyDescriptors: function getOwnPropertyDescriptors(object) {	CODE
LOW	packages/core-js/modules/es.map.get-or-insert.js	13	getOrInsert: function getOrInsert(key, value) {	CODE

Over-Commented Block18 hits · 18 pts

Severity	File	Line	Snippet	Context
LOW	deno/corejs/index.js	17701	// https://bugzilla.mozilla.org/show_bug.cgi?id=1778762	COMMENT
LOW	tests/unit-pure/web.url.js	221	assert.same(String(url), 'file:///var/log/system.log', 'file -> ip');	COMMENT
LOW	tests/unit-pure/web.url.js	421	assert.same(url.host, '192.168.0.240');	COMMENT
LOW	tests/unit-pure/web.url.js	501	// url = new URL('http://zloirock.ru/foo');	COMMENT
LOW	tests/eslint/eslint.config.js	581	// unicorn	COMMENT
LOW	tests/eslint/eslint.config.js	601	'unicorn/filename-case': [ERROR, { case: 'kebabCase' }],	COMMENT
LOW	tests/eslint/eslint.config.js	701	// prefer `Date.now()` to get the number of milliseconds since the Unix Epoch	COMMENT
LOW	tests/eslint/eslint.config.js	721	'unicorn/prefer-negative-index': ERROR,	COMMENT
LOW	tests/eslint/eslint.config.js	2261	// and that if `contributors` is present, it should include at least one contributor	COMMENT
LOW	tests/unit-global/web.url.js	241	// assert.same(url.href, 'http://192.168.0.240/', 'file -> http');	COMMENT
LOW	tests/unit-global/web.url.js	441	assert.same(String(url), 'http://192.168.0.240/foo');	COMMENT
LOW	tests/unit-global/web.url.js	521	// url = new URL('http://zloirock.ru/foo');	COMMENT
LOW	packages/core-js/internals/array-iteration.js	61	// https://tc39.es/ecma262/#sec-array.prototype.every	COMMENT
LOW	packages/core-js/modules/es.typed-array.iterator.js	41	// `%TypedArray%.prototype.values` method	COMMENT
LOW	packages/core-js/modules/web.url.constructor.js	1101	// `URL.prototype.href` accessors pair	COMMENT
LOW	packages/core-js/modules/web.url.constructor.js	1121	defineBuiltInAccessor(URLPrototype, 'hostname', accessorDescriptor('getHostname', 'setHostname'));	COMMENT
LOW	packages/core-js/modules/web.structured-clone.js	101	// https://issues.chromium.org/issues/42202488	COMMENT
LOW	packages/core-js/modules/web.structured-clone.js	121	return serialized;	COMMENT