Ejemplo
@jest/transform 29.7.0: determine coverage instrumentation with shouldInstrument and handle syntax errors with handlePotentialSyntaxError
Muestra verificada para npm @jest/transform 29.7.0: determine coverage instrumentation with shouldInstrument and handle syntax errors with…
sha256:e8ff88bce8caa42c2f11837fee8128755076f4cc3a99870d59820ab610d873ff
Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido.
Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas.
MIT-0
Evidencia de ejecución
El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.
- Base de evidencia
- Contrato firmado aprobado
- Recibos de verificación
- 1
- Claves de firma que lo compilaron
- 1
Entorno declarado
node linux 24 · ubuntu · glibc 2.39 x64 node node npm
Entornos de las ejecuciones de verificación
| Entorno | Contrato | Etapas | Ejecución |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5… |
2026-08-26 |
Caso
HOW- Objetivo
- determine coverage instrumentation with shouldInstrument and handle syntax errors with handlePotentialSyntaxError
- Paquetes
- Símbolos
-
- handlePotentialSyntaxError
- shouldInstrument
- Entorno
- node
- Creado
- 2026-08-26T06:42:10Z
Contrato
- shouldInstrument is a callable function exported by @jest/transform
- shouldInstrument returns true for source files matching collectCoverageFrom patterns
- shouldInstrument returns false when collectCoverage option is disabled
- shouldInstrument returns false for ignored paths specified in coveragePathIgnorePatterns (e.g. node_modules)
- shouldInstrument returns false for test files matching testMatch or testRegex
- shouldInstrument returns true for test files when overridden by forceCoverageMatch
- shouldInstrument returns false for JSON files and files in __mocks__ directories
- handlePotentialSyntaxError is a callable function exported by @jest/transform
- handlePotentialSyntaxError returns non-SyntaxError instances unmodified without throwing
- handlePotentialSyntaxError throws enhanced SyntaxError containing code frame and Jest diagnostic explanation
Archivos
- NOTES.md
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- src/index.mjs
- test/contract.mjs
Código fuente
# Jest Transform: `@jest/transform`
## Prior Solutions Search
An initial search of known solutions for `@jest/transform@29.7.0` with symbols `shouldInstrument` and `handlePotentialSyntaxError` returned `NO_SAFE_MATCH`.
## Pinned Release
- `@jest/transform`: `29.7.0`
- Runtime: Node.js (`>=18`, tested on Node 22+)
## Observed Behaviour
1. **Coverage Instrumentation Evaluation (`shouldInstrument`)**:
- `shouldInstrument(filename, options, config, loadedFilenames)` determines whether Jest should inject coverage instrumentation into a given source file.
- Requires `options.collectCoverage: true` to proceed; otherwise returns `false`.
- Rejects files matching `coveragePathIgnorePatterns` (e.g. `node_modules`).
- Rejects test files matching `testMatch` or `testRegex` unless explicitly overridden by `forceCoverageMatch`.
- Excludes `.json` files and files inside `/__mocks__/` directories.
- Evaluates `options.collectCoverageFrom` glob patterns relative to `config.rootDir`.
2. **Syntax Error Diagnostic Enhancement (`handlePotentialSyntaxError`)**:
- `handlePotentialSyntaxError(error)` inspects error instances encountered during file compilation and transformation.
- For non-`SyntaxError` instances (such as `TypeError`), it returns the error unmodified without throwing.
- When given a `SyntaxError` (not matching `' expected'`), it attaches code frame snippets to the stack and decorates the message with detailed Jest troubleshooting guidance (pointing to ESM, TypeScript, `transformIgnorePatterns`, `transform`, and `moduleNameMapper` docs) before throwing the enhanced error.
## Failure Mode
Passing an incomplete `config` object missing array properties such as `forceCoverageMatch` or `coveragePathIgnorePatterns` causes `shouldInstrument` to fail with `TypeError: Cannot read properties of undefined (reading 'length')`. Providing a normalized `ProjectConfig` with initialized arrays ensures correct coverage determination.
Clean-room public code sample — generation instructions
Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.
A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.
Goal: determine coverage instrumentation with shouldInstrument and handle syntax errors with handlePotentialSyntaxError
Kind: HOW
Use EXACTLY these public packages and versions:
- pkg:npm/%40jest/transform@29.7.0
Demonstrate these symbols/APIs:
- handlePotentialSyntaxError
- shouldInstrument
Rules:
- One focused purpose; the smallest project that proves the goal.
- Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
- Pin every dependency with a lockfile so resolution is reproducible.
- No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
- No personal names, emails, company names, or project identifiers of any kind.
- No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
- Keep it under 200 files and 256KB packed.
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"resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
"integrity": "sha512-ts/8E8l5b7kY0vlWLewOkDXMmPdLcVV4GmOQLyxuSswIJsweeFZtAsMF7k1Nszz+TYBQrlYRmzOnr398y1JemQ==",
"license": "Apache-2.0",
"dependencies": {
"makeerror": "1.0.12"
}
},
"node_modules/wrappy": {
"version": "1.0.2",
"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
"integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
"license": "ISC"
},
"node_modules/write-file-atomic": {
"version": "4.0.2",
"resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-4.0.2.tgz",
"integrity": "sha512-7KxauUdBmSdWnmpaGFg+ppNjKF8uNLry8LyzjauQDOVONfFLNKrKvQOxZ/VuTIcS/gge/YNahf5RIIQWTSarlg==",
"license": "ISC",
"dependencies": {
"imurmurhash": "^0.1.4",
"signal-exit": "^3.0.7"
},
"engines": {
"node": "^12.13.0 || ^14.15.0 || >=16.0.0"
}
},
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"version": "3.1.1",
"resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
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"license": "ISC"
}
}
}
{
"name": "csx-sample-jest-transform",
"version": "1.0.0",
"private": true,
"type": "module",
"license": "MIT-0",
"dependencies": {
"@jest/transform": "29.7.0"
}
}
{
"schemaVersion": 1,
"goal": "determine coverage instrumentation with shouldInstrument and handle syntax errors with handlePotentialSyntaxError",
"kind": "HOW",
"packages": [
"pkg:npm/%40jest/transform@29.7.0"
],
"symbols": [
"handlePotentialSyntaxError",
"shouldInstrument"
]
}
import { shouldInstrument, handlePotentialSyntaxError } from '@jest/transform';
export { shouldInstrument, handlePotentialSyntaxError };
/**
* Helper to construct a normalized Jest project configuration for coverage decisions.
*
* @param {string} rootDir - Root directory of the project.
* @param {object} [overrides={}] - Configuration overrides.
* @returns {object} - Normalized Jest ProjectConfig required by shouldInstrument.
*/
export function createDefaultProjectConfig(rootDir, overrides = {}) {
return {
rootDir,
forceCoverageMatch: [],
testPathIgnorePatterns: [],
testRegex: [],
testMatch: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[jt]s?(x)'],
coveragePathIgnorePatterns: ['node_modules'],
globalSetup: undefined,
globalTeardown: undefined,
setupFiles: [],
setupFilesAfterEnv: [],
...overrides,
};
}
/**
* Determines whether a file should be instrumented for code coverage.
*
* @param {string} filename - Absolute or relative file path to check.
* @param {object} [options={}] - Coverage options (e.g. collectCoverage, collectCoverageFrom).
* @param {object} [configOverrides={}] - ProjectConfig overrides.
* @param {string} [rootDir='/workspace/project'] - Root directory.
* @returns {boolean} - True if file should be instrumented.
*/
export function checkCoverageInstrumentation(
filename,
options = {},
configOverrides = {},
rootDir = '/workspace/project'
) {
const config = createDefaultProjectConfig(rootDir, configOverrides);
const coverageOptions = {
collectCoverage: true,
collectCoverageFrom: ['src/**/*.{js,ts}'],
...options,
};
return shouldInstrument(filename, coverageOptions, config);
}
/**
* Enhances a JavaScript error with Jest's unexpected token diagnostic if it is a SyntaxError.
*
* @param {Error} error - The error to inspect and handle.
* @param {string} [codeFrame] - Optional code snippet frame illustrating syntax error location.
* @returns {Error} - Unmodified error if not a syntax error.
* @throws {Error} - Throws enhanced syntax error if error is SyntaxError.
*/
export function processSyntaxError(error, codeFrame) {
if (codeFrame != null) {
error.codeFrame = codeFrame;
}
return handlePotentialSyntaxError(error);
}
import { strict as assert } from 'node:assert';
import {
shouldInstrument,
handlePotentialSyntaxError,
createDefaultProjectConfig,
checkCoverageInstrumentation,
processSyntaxError,
} from '../src/index.mjs';
const rootDir = '/workspace/project';
const baseConfig = createDefaultProjectConfig(rootDir);
const baseOptions = {
collectCoverage: true,
collectCoverageFrom: ['src/**/*.{js,ts}'],
};
// 1. shouldInstrument is a callable function exported by @jest/transform
assert.equal(typeof shouldInstrument, 'function', 'shouldInstrument must be a function');
// 2. shouldInstrument returns true for source files matching collectCoverageFrom patterns
const sourceFile = `${rootDir}/src/calculator.js`;
assert.equal(
shouldInstrument(sourceFile, baseOptions, baseConfig),
true,
'Source file matching collectCoverageFrom should be instrumented'
);
assert.equal(
checkCoverageInstrumentation(sourceFile, {}, {}, rootDir),
true,
'Helper checkCoverageInstrumentation should return true for source file'
);
// 3. shouldInstrument returns false when collectCoverage option is disabled
assert.equal(
shouldInstrument(sourceFile, { ...baseOptions, collectCoverage: false }, baseConfig),
false,
'File must not be instrumented when collectCoverage is false'
);
// 4. shouldInstrument returns false for ignored paths specified in coveragePathIgnorePatterns (e.g. node_modules)
const nodeModuleFile = `${rootDir}/node_modules/library/index.js`;
assert.equal(
shouldInstrument(nodeModuleFile, baseOptions, baseConfig),
false,
'node_modules files must not be instrumented'
);
// 5. shouldInstrument returns false for test files matching testMatch or testRegex
const testFile = `${rootDir}/src/calculator.test.js`;
assert.equal(
shouldInstrument(testFile, baseOptions, baseConfig),
false,
'Test files matching testMatch must not be instrumented by default'
);
// 6. shouldInstrument returns true for test files when overridden by forceCoverageMatch
const forcedConfig = createDefaultProjectConfig(rootDir, {
forceCoverageMatch: ['**/*.test.js'],
});
assert.equal(
shouldInstrument(testFile, baseOptions, forcedConfig),
true,
'Test file should be instrumented when matched by forceCoverageMatch'
);
// 7. shouldInstrument returns false for JSON files and files in __mocks__ directories
const jsonFile = `${rootDir}/src/config.json`;
const mockFile = `${rootDir}/src/__mocks__/storage.js`;
assert.equal(
shouldInstrument(jsonFile, baseOptions, baseConfig),
false,
'JSON files must not be instrumented'
);
assert.equal(
shouldInstrument(mockFile, baseOptions, baseConfig),
false,
'__mocks__ directory files must not be instrumented'
);
// 8. handlePotentialSyntaxError is a callable function exported by @jest/transform
assert.equal(typeof handlePotentialSyntaxError, 'function', 'handlePotentialSyntaxError must be a function');
// 9. handlePotentialSyntaxError returns non-SyntaxError instances unmodified without throwing
const typeErr = new TypeError('Invalid argument type');
const handledTypeError = processSyntaxError(typeErr);
assert.equal(handledTypeError, typeErr, 'Non-SyntaxError instance must be returned unmodified');
// 10. handlePotentialSyntaxError throws enhanced SyntaxError containing code frame and Jest diagnostic explanation
const syntaxErr = new SyntaxError('Unexpected token');
const codeFrame = ' 1 | const sum = (a, b) => => a + b;\n | ^';
assert.throws(
() => {
processSyntaxError(syntaxErr, codeFrame);
},
(err) => {
return (
err instanceof SyntaxError &&
err.stack.includes('Jest encountered an unexpected token') &&
err.stack.includes('const sum = (a, b) => => a + b;') &&
err.stack.includes('code-transformation')
);
},
'handlePotentialSyntaxError must throw enhanced SyntaxError with diagnostics'
);
console.log('CONTRACT PASS: @jest/transform shouldInstrument and handlePotentialSyntaxError verified');
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