AI Slop Code Risk Monitor

date-fns/date-fns

Name: date-fns/date-fns — TypeScript 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).

⏳ Modern JavaScript date utility library ⌛️

0.3 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for date-fns/date-fns, a TypeScript project with 36,659 GitHub stars. SynthScan examined 192,885 lines of code across 2017 source files, recording 46 pattern matches distributed across 4 syntactic categories. The legacy adjusted pattern signal is 0.3 (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.

0.3

Adjusted Signal

0.3

Raw Pattern Score

100%

Time Factor

2026-10-26

Last Push

36.7K

Stars

TypeScript

Language

192.9K

Lines of Code

2.0K

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 1.1/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 43 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 1.2/100 · LOW

Are wrappers, guards, and repeated structures necessary? 33 finding(s).

PR Review Velocity Impact 1.6/100 · LOW

Which changes need focused human review? 46 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 3MEDIUM 0LOW 43

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 46 distinct pattern matches across 4 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 Identifiers30 hits · 30 pts

Severity	File	Line	Snippet	Context
LOW	pkgs/core/src/areIntervalsOverlapping/index.tp.ts	6	export function tpyAreIntervalsOverlapping(	CODE
LOW	pkgs/core/src/differenceInCalendarDays/index.tp.ts	6	export function tpyDifferenceInCalendarDays(	CODE
LOW	pkgs/core/src/differenceInBusinessDays/index.tp.ts	7	export function tpyDifferenceInBusinessDays(	CODE
LOW	pkgs/core/src/formatDistanceToNowStrict/index.ts	83	export function formatDistanceToNowStrict(	CODE
LOW	…core/src/_lib/getTimezoneOffsetInMilliseconds/index.ts	15	export function getTimezoneOffsetInMilliseconds(	CODE
LOW	pkgs/core/src/_lib/test/tzOffsetTransitions.ts	65	function previousTickTimezoneOffset(date: Date): number {	CODE
LOW	pkgs/core/src/_lib/format/formatters/index.ts	780	function formatTimezoneWithOptionalMinutes(	CODE
LOW	pkgs/core/src/_lib/protectedTokens/index.ts	6	export function isProtectedDayOfYearToken(token: string) {	CODE
LOW	pkgs/core/src/_lib/protectedTokens/index.ts	14	export function warnOrThrowProtectedError(	CODE
LOW	pkgs/core/src/tp/areIntervalsOverlapping/index.ts	3	export function tpAreIntervalsOverlapping(	CODE
LOW	pkgs/core/src/tp/differenceInBusinessDays/index.ts	3	export function tpDifferenceInBusinessDays(	CODE
LOW	pkgs/core/src/tp/_lib/shiftMonthsWithOverflow/index.ts	2	export function tpShiftMonthsWithOverflow(	CODE
LOW	pkgs/core/src/tp/differenceInISOWeekYears/index.ts	3	export function tpDifferenceInISOWeekYears(	CODE
LOW	pkgs/core/src/tp/differenceInCalendarWeeks/index.ts	3	export function tpDifferenceInCalendarWeeks(	CODE
LOW	pkgs/core/src/differenceInCalendarQuarters/index.tp.ts	6	export function tpyDifferenceInCalendarQuarters(	CODE
LOW	pkgs/core/src/differenceInCalendarQuarters/index.ts	38	export function differenceInCalendarQuarters(	CODE
LOW	pkgs/core/src/differenceInMilliseconds/index.tp.ts	4	export function tpyDifferenceInMilliseconds(	CODE
LOW	pkgs/core/src/differenceInCalendarMonths/index.tp.ts	6	export function tpyDifferenceInCalendarMonths(	CODE
LOW	pkgs/core/src/differenceInCalendarMonths/index.ts	44	export function differenceInCalendarMonths(	CODE
LOW	pkgs/core/src/differenceInCalendarYears/index.tp.ts	6	export function tpyDifferenceInCalendarYears(	CODE
LOW	pkgs/core/src/differenceInCalendarYears/index.ts	44	export function differenceInCalendarYears(	CODE
LOW	pkgs/core/src/differenceInCalendarISOWeeks/index.tp.ts	7	export function tpyDifferenceInCalendarISOWeeks(	CODE
LOW	pkgs/core/src/differenceInCalendarISOWeeks/index.ts	42	export function differenceInCalendarISOWeeks(	CODE
LOW	pkgs/core/src/differenceInISOWeekYears/index.tp.ts	7	export function tpyDifferenceInISOWeekYears(	CODE
LOW	…/core/src/differenceInCalendarISOWeekYears/index.tp.ts	6	export function tpyDifferenceInCalendarISOWeekYears(	CODE
LOW	pkgs/core/src/differenceInCalendarISOWeekYears/index.ts	47	export function differenceInCalendarISOWeekYears(	CODE
LOW	pkgs/core/src/differenceInCalendarWeeks/index.tp.ts	8	export function tpyDifferenceInCalendarWeeks(	CODE
LOW	pkgs/core/src/differenceInCalendarWeeks/index.ts	56	export function differenceInCalendarWeeks(	CODE
LOW	pkgs/core/src/getOverlappingDaysInIntervals/index.ts	42	export function getOverlappingDaysInIntervals(	CODE
LOW	pkgs/tz/src/date/mini.js	508	function constructorArgsToInternalTime(args) {	CODE

Cross-File Repetition3 hits · 15 pts

Severity	File	Snippet	Context
HIGH	pkgs/core/mise.toml	arg "[test]" help="smoke test to run" default="..."	STRING
HIGH	pkgs/tz/mise.toml	arg "[test]" help="smoke test to run" default="..."	STRING
HIGH	pkgs/utc/mise.toml	arg "[test]" help="smoke test to run" default="..."	STRING

Over-Commented Block12 hits · 12 pts

Severity	File	Line	Snippet	Context
LOW	pkgs/core/src/parse/index.ts	41	// (one of the certain letters followed by `o`)	COMMENT
LOW	pkgs/core/src/lightFormat/index.ts	1	import { lightFormatters } from "../_lib/format/lightFormatters/index.ts";	COMMENT
LOW	pkgs/core/src/format/index.ts	21		COMMENT
LOW	pkgs/tz/src/date/mini.js	1	import { tzOffset } from "../tzOffset/index.ts";	COMMENT
LOW	pkgs/tz/src/date/mini.js	161		COMMENT
LOW	pkgs/tz/src/date/mini.js	241		COMMENT
LOW	pkgs/tz/src/date/mini.js	301	: Math.ceil(testOffsetWithSeconds);	COMMENT
LOW	pkgs/tz/src/date/mini.js	321	// it backward.	COMMENT
LOW	pkgs/tz/src/date/mini.js	341		COMMENT
LOW	pkgs/tz/src/date/mini.js	361	// Seconds part contributed by the system time zone offset. Negative offsets	COMMENT
LOW	pkgs/tz/src/date/mini.js	441	// Apply the target-DST correction to external. In the backward-crossing case	COMMENT
LOW	pkgs/tz/src/date/mini.js	461	const newOffset =	COMMENT

Redundant / Tautological Comments1 hit · 2 pts

Severity	File	Line	Snippet	Context
LOW	pkgs/core/scripts/maintain/upgradePnpm.sh	37	# Check if there are any staged changes	COMMENT