AI Slop Code Risk Monitor

immerjs/immer

Name: immerjs/immer — 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).

Create the next immutable state by mutating the current one

1.4 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for immerjs/immer, a JavaScript project with 28,999 GitHub stars. SynthScan examined 46,637 lines of code across 107 source files, recording 37 pattern matches distributed across 8 syntactic categories. The legacy adjusted pattern signal is 1.4 (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.

1.4

Adjusted Signal

1.4

Raw Pattern Score

100%

Time Factor

2026-10-22

Last Push

29.0K

Stars

JavaScript

Language

46.6K

Lines of Code

107

Files

Pattern Hits

2026-10-31

Scan Date

0.01

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 4.7/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 27 finding(s).

Hallucinated Dependency & Supply Chain Risk 2.0/100 · LOW

Are imports declared and package/API names verified? 10 finding(s).

Agent Over-Engineering Ratio 0.6/100 · LOW

Are wrappers, guards, and repeated structures necessary? 6 finding(s).

PR Review Velocity Impact 5.2/100 · LOW

Which changes need focused human review? 37 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 1HIGH 0MEDIUM 2LOW 34

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 37 distinct pattern matches across 8 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.

Verbosity Indicators7 hits · 14 pts

Severity	File	Line	Snippet	Context
LOW⚡	src/plugins/patches.ts	51	// Step 1: Check if state has a stored key	COMMENT
LOW⚡	src/plugins/patches.ts	53	// Step 2: Validate the key is still valid in parent	COMMENT
LOW	src/plugins/patches.ts	73	// Step 3: Handle Set case specially	COMMENT
LOW	src/plugins/patches.ts	85	// Step 4: Validate key still exists in parent	COMMENT
LOW⚡	src/plugins/patches.ts	102	// Step 5: Add key to path	COMMENT
LOW⚡	src/plugins/patches.ts	106	// Step 6: Recurse to parent if exists	COMMENT
LOW⚡	src/plugins/patches.ts	111	// Step 7: At root - reverse path and validate	COMMENT

Structural Annotation Overuse7 hits · 14 pts

Severity	File	Line	Snippet	Context
LOW⚡	src/plugins/patches.ts	51	// Step 1: Check if state has a stored key	COMMENT
LOW⚡	src/plugins/patches.ts	53	// Step 2: Validate the key is still valid in parent	COMMENT
LOW	src/plugins/patches.ts	73	// Step 3: Handle Set case specially	COMMENT
LOW	src/plugins/patches.ts	85	// Step 4: Validate key still exists in parent	COMMENT
LOW⚡	src/plugins/patches.ts	102	// Step 5: Add key to path	COMMENT
LOW⚡	src/plugins/patches.ts	106	// Step 6: Recurse to parent if exists	COMMENT
LOW⚡	src/plugins/patches.ts	111	// Step 7: At root - reverse path and validate	COMMENT

Hallucination Indicators1 hit · 10 pts

Severity	File	Line	Snippet	Context
CRITICAL	__tests__/patch.js	1593	draft.queries.queryKey.data.items.push({name: "item2"})	CODE

Fake / Example Data9 hits · 9 pts

Severity	File	Line	Snippet	Context
LOW	__performance_tests__/data.json	5777	"about": "Laboris aliqua labore esse officia Lorem. Ad occaecat ullamco est quis cillum Lorem ipsum eu laboris velit	CODE
LOW	__performance_tests__/data.json	7577	"about": "Ut labore consequat occaecat deserunt qui in. Lorem ipsum commodo culpa minim proident amet voluptate eius	CODE
LOW	__performance_tests__/data.json	8657	"about": "Eu est esse Lorem ipsum aute non labore qui id ad exercitation deserunt. Velit nulla nostrud laboris velit	CODE
LOW	__performance_tests__/data.json	11537	"about": "Enim Lorem ipsum Lorem culpa officia ad et esse ullamco fugiat. Eiusmod non tempor quis ad eu elit magna a	CODE
LOW	__performance_tests__/data.json	12977	"about": "Commodo consectetur occaecat non nostrud est sunt sunt incididunt mollit qui eiusmod laboris do esse. Et e	CODE
LOW	__performance_tests__/data.json	16442	"about": "Commodo elit eu irure ex eu eiusmod ipsum et laboris enim dolore nulla fugiat enim. Excepteur non dolor an	CODE
LOW	__performance_tests__/data.json	17342	"about": "Est veniam irure dolore aliquip ex. Dolore minim sunt eu voluptate aliqua. Enim elit cupidatat cupidatat l	CODE
LOW	__performance_tests__/data.json	21707	"about": "Et ea veniam amet nisi labore enim elit. Mollit eu laborum nulla fugiat qui mollit dolor. Reprehenderit no	CODE
LOW	__performance_tests__/data.json	23057	"about": "Fugiat ad eu eu dolor nisi occaecat velit proident velit nostrud enim. Adipisicing aute dolore aute exerci	CODE

Hyper-Verbose Identifiers6 hits · 6 pts

Severity	File	Line	Snippet	Context
LOW	src/core/finalize.ts	169	export function registerChildFinalizationCallback(	CODE
LOW	src/core/finalize.ts	194	function generatePatchesAndFinalize(state: ImmerState, rootScope: ImmerScope) {	CODE
LOW	src/plugins/patches.ts	247	function generatePatchesFromAssigned(	CODE
LOW	src/plugins/arrayMethods.ts	299	function handleReorderingOperation(	CODE
LOW	src/plugins/arrayMethods.ts	440	function handleNonMutatingOperation(	CODE
LOW	src/utils/common.ts	291	function dontMutateFrozenCollections() {	CODE

Over-Commented Block5 hits · 5 pts

Severity	File	Line	Snippet	Context
LOW	perf-testing/read-cpuprofile.js	441	// .map(([category, funcMap]) => {	COMMENT
LOW	perf-testing/read-cpuprofile.js	461	// .sort((a, b) => b[1] - a[1])	COMMENT
LOW	perf-testing/read-cpuprofile.js	481	// if (funcKey.includes("[unknown]")) {	COMMENT
LOW	perf-testing/read-cpuprofile.js	501	// uncategorizedStats.forEach(([func, samples]) => {	COMMENT
LOW	perf-testing/read-cpuprofile.js	521		COMMENT

AI Slop Vocabulary1 hit · 3 pts

Severity	File	Line	Snippet	Context
MEDIUM	__tests__/regressions.js	167	// That's roughly what seamless-immutable does	COMMENT

Slop Phrases1 hit · 2 pts

Severity	File	Line	Snippet	Context
MEDIUM	_site/readme/index.html	241	Here is a simple example of the difference that Immer could make in practice.	CODE