AI Slop Code Risk Monitor

acornjs/acorn

Name: acornjs/acorn — 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).

A small, fast, JavaScript-based JavaScript parser

0.7 Low pattern signal View on GitHub

Open-Source Code Quality, Security and Technical Debt Review

This report summarizes scanner evidence for acornjs/acorn, a JavaScript project with 11,469 GitHub stars. SynthScan examined 92,645 lines of code across 91 source files, recording 62 pattern matches distributed across 3 syntactic categories. The legacy adjusted pattern signal is 0.7 (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.

0.7

Adjusted Signal

0.7

Raw Pattern Score

100%

Time Factor

2026-10-21

Last Push

11.5K

Stars

JavaScript

Language

92.6K

Lines of Code

Files

Pattern Hits

2026-10-31

Scan Date

0.02

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 2.7/100 · LOW

Can maintainers explain intent, assumptions, and trade-offs? 60 finding(s).

Hallucinated Dependency & Supply Chain Risk 0.5/100 · LOW

Are imports declared and package/API names verified? 2 finding(s).

Agent Over-Engineering Ratio 0.3/100 · LOW

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

PR Review Velocity Impact 3.8/100 · LOW

Which changes need focused human review? 62 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 2MEDIUM 0LOW 60

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 62 distinct pattern matches across 3 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.

Over-Commented Block54 hits · 44 pts

Severity	File	Line	Snippet	Context
LOW	test/tests-async-iteration.js	1101	testFail("class A { async* f() { () => await a; } }", "Unexpected token (1:35)", { ecmaVersion: 9 })	COMMENT
LOW	test/tests-async-iteration.js	1121	// "type": "ForOfStatement",	COMMENT
LOW	test/tests-async-iteration.js	1141	// }	COMMENT
LOW	test/tests-async-iteration.js	1161	// }	COMMENT
LOW	test/tests-async-iteration.js	1181	// "object": {	COMMENT
LOW	test/tests-async-iteration.js	1301	"type": "BlockStatement"	COMMENT
LOW	test/tests-async-iteration.js	1321	// testFail("var C = class { static async *method() { super(); } }", "", { "ecmaVersion": 9 })	COMMENT
LOW	test/tests-async-iteration.js	1341	// "start": 4,	COMMENT
LOW	test/tests-async-iteration.js	1361	// "name": "method"	COMMENT
LOW	test/tests-async-iteration.js	1381	// "kind": "var",	COMMENT
LOW	test/tests-async-iteration.js	1401	// "params": [],	COMMENT
LOW	test/tests-async-iteration.js	1421	// }	COMMENT
LOW	test/tests-async-iteration.js	1441	// "sourceType": "script"	COMMENT
LOW	test/tests-async-iteration.js	1461	// "body": {	COMMENT
LOW	test/tests-async-iteration.js	1481	// },	COMMENT
LOW	test/tests-async-iteration.js	1501	// "type": "CallExpression",	COMMENT
LOW	test/tests-async-iteration.js	1521	// }	COMMENT
LOW	test/tests-async-iteration.js	1541	// "type": "VariableDeclarator",	COMMENT
LOW	test/tests-async-iteration.js	1561	// "computed": false,	COMMENT
LOW	test/tests-async-iteration.js	1581	// "body": [	COMMENT
LOW	test/tests-async-iteration.js	1601	// "end": 62,	COMMENT
LOW	test/tests-async-iteration.js	1621	// "type": "Super",	COMMENT
LOW	test/tests-async-iteration.js	1641	// }	COMMENT
LOW	test/tests-async-iteration.js	1661	// "id": null,	COMMENT
LOW	test/tests-async-iteration.js	1681	// "id": {	COMMENT
LOW	test/tests-async-iteration.js	1701	// {	COMMENT
LOW	test/tests-async-iteration.js	1721	// ]	COMMENT
LOW	test/tests-async-iteration.js	1741	// "type": "VariableDeclaration",	COMMENT
LOW	test/tests-async-iteration.js	1761	// "type": "Property",	COMMENT
LOW	test/tests-async-iteration.js	1781	// "params": [],	COMMENT
LOW	test/tests-async-iteration.js	1801	// },	COMMENT
LOW	test/tests-async-iteration.js	1821	// "type": "FunctionExpression",	COMMENT
LOW	test/tests-async-iteration.js	1841	// "end": 64,	COMMENT
LOW	test/tests-async-iteration.js	1861	// ]	COMMENT
LOW	test/tests-async-iteration.js	1881	// "type": "ExportDefaultDeclaration",	COMMENT
LOW	test/tests-async-iteration.js	1901	// "end": 74,	COMMENT
LOW	test/tests-async-iteration.js	1921	// "end": 72,	COMMENT
LOW	test/tests-async-iteration.js	1941	// "type": "BlockStatement",	COMMENT
LOW	test/tests-async-iteration.js	1961	// ]	COMMENT
LOW	acorn/src/lval.js	181	if (this.options.ecmaVersion < 6 \|\| !this.eat(tt.eq)) return left	COMMENT
LOW	acorn/src/lval.js	201	//	COMMENT
LOW	acorn/src/lval.js	221	// which the spec says	COMMENT
LOW	acorn/src/options.js	1	import {hasOwn, isArray} from "./util.js"	COMMENT
LOW	acorn/src/options.js	21	strict: false,	COMMENT
LOW	acorn/src/options.js	41	// in a script isn't considered an error.	COMMENT
LOW	acorn/src/options.js	61	// nodes.	COMMENT
LOW	acorn/src/options.js	81	// passed, the full `{line, column}` locations of the start and	COMMENT
LOW	acorn/src/index.js	1	// Acorn is a tiny, fast JavaScript parser written in JavaScript.	COMMENT
LOW	acorn/src/tokentype.js	1	// ## Token types	COMMENT
LOW	acorn/src/tokentype.js	81		COMMENT
LOW	acorn/src/expression.js	1	// A recursive descent parser operates by defining functions for all	COMMENT
LOW	acorn/src/expression.js	81	// ### Expression parsing	COMMENT
LOW	acorn-loose/src/index.js	1	// Acorn: Loose parser	COMMENT
LOW	acorn-walk/src/index.js	1	// AST walker module for ESTree compatible trees	COMMENT

Cross-Language Confusion (JS/TS)2 hits · 10 pts

Severity	File	Line	Snippet	Context
HIGH	acorn/src/bin/acorn.js	10	print("usage: " + basename(process.argv[1]) + " [--ecma3\|--ecma5\|--ecma6\|--ecma7\|--ecma8\|--ecma9\|...\|--ecma2015\|--ecma	CODE
HIGH	acorn/src/bin/acorn.js	11	print(" [--tokenize] [--locations] [--allow-hash-bang] [--allow-await-outside-function] [--compact] [--silent]	CODE

Hyper-Verbose Identifiers6 hits · 6 pts

Severity	File	Line	Snippet	Context
LOW	acorn/src/regexp.js	451	function isRegularExpressionModifier(ch) {	CODE
LOW	acorn/src/regexp.js	944	function isUnicodePropertyNameCharacter(ch) {	CODE
LOW	acorn/src/regexp.js	959	function isUnicodePropertyValueCharacter(ch) {	CODE
LOW	acorn/src/regexp.js	1215	function isClassSetReservedDoublePunctuatorCharacter(ch) {	CODE
LOW	acorn/src/regexp.js	1229	function isClassSetSyntaxCharacter(ch) {	CODE
LOW	acorn/src/regexp.js	1252	function isClassSetReservedPunctuator(ch) {	CODE