CodeSampleX

Ejemplo

babel-plugin-istanbul 6.1.1

Muestra verificada para npm babel-plugin-istanbul 6.1.1. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:1dca9522f2fbfd3a4eefeb8d6cbba570880c202234651872598c820470d6a069

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 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-08-27

Caso

HOW
Objetivo
verify pkg:npm/babel-plugin-istanbul@6.1.1
Paquetes
Entorno
node 22.23.2
Creado
2026-08-27T12:29:53Z

Contrato

  1. babel-plugin-istanbul default export is a Babel plugin function declaring Babel 7 compatibility
  2. Plugin visitor exposes Program enter and exit lifecycle handlers
  3. Program visitor initializes NYC configuration with default and custom options
  4. Program visitor respects include and exclude filter patterns to skip non-matching files
  5. Program visitor generates AST instrumentation and records coverage metrics on Program exit
  6. Program visitor invokes onCover callback with resolved file path and coverage metadata
  7. Program visitor supports custom coverageVariable configuration

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

PROMPT.md
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: verify pkg:npm/babel-plugin-istanbul@6.1.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/babel-plugin-istanbul@6.1.1
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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.
csx.json
{"case":{"caseId":"case:sha256:31d2b286da920d750f51bc00014ef81b1089e476493c3e0c9c3f2b094f96f522","constraints":{"executionContext":"node"},"contract":["babel-plugin-istanbul default export is a Babel plugin function declaring Babel 7 compatibility","Plugin visitor exposes Program enter and exit lifecycle handlers","Program visitor initializes NYC configuration with default and custom options","Program visitor respects include and exclude filter patterns to skip non-matching files","Program visitor generates AST instrumentation and records coverage metrics on Program exit","Program visitor invokes onCover callback with resolved file path and coverage metadata","Program visitor supports custom coverageVariable configuration"],"goal":"verify pkg:npm/babel-plugin-istanbul@6.1.1","kind":"HOW","packages":["pkg:npm/babel-plugin-istanbul@6.1.1"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/babel-plugin-istanbul@6.1.1"],"schemaVersion":1,"subject":"pkg:npm/babel-plugin-istanbul@6.1.1","verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-plugin-istanbul",
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  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "sample-babel-plugin-istanbul",
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      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
      "license": "ISC"
    }
  }
}
package.json
{
  "name": "sample-babel-plugin-istanbul",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "babel-plugin-istanbul": "6.1.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/babel-plugin-istanbul@6.1.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/babel-plugin-istanbul@6.1.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import babelPluginIstanbulModule from "babel-plugin-istanbul";

export const babelPluginIstanbul =
  typeof babelPluginIstanbulModule === "function"
    ? babelPluginIstanbulModule
    : babelPluginIstanbulModule.default || babelPluginIstanbulModule;

export function instantiatePlugin(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === "function") {
        api.assertVersion(range);
      }
    },
    types: api.types || createDefaultTypes(),
    ...api
  };
  return babelPluginIstanbul(normalizedApi, options);
}

export function createDefaultTypes() {
  return {
    valueToNode: (v) => ({ type: "ObjectExpression", value: v }),
    program: (body) => ({ type: "Program", body }),
    stringLiteral: (v) => ({ type: "StringLiteral", value: v }),
    numericLiteral: (v) => ({ type: "NumericLiteral", value: v }),
    identifier: (name) => ({ type: "Identifier", name }),
    booleanLiteral: (v) => ({ type: "BooleanLiteral", value: v }),
    nullLiteral: () => ({ type: "NullLiteral" }),
    callExpression: (callee, args) => ({ type: "CallExpression", callee, arguments: args }),
    expressionStatement: (expression) => ({ type: "ExpressionStatement", expression }),
    variableDeclaration: (kind, declarations) => ({ type: "VariableDeclaration", kind, declarations }),
    isStatement: () => false,
    isExpression: () => true
  };
}

export function createMockProgramPath(filename = "sample.js") {
  const body = [];
  const comments = [];
  const scope = {
    hasBinding: () => false,
    getBinding: () => null
  };

  const path = {
    node: {
      type: "Program",
      body,
      comments
    },
    scope,
    isProgram() {
      return true;
    },
    find(fn) {
      return fn(this) ? this : null;
    },
    traverse(visitor, state) {
      // traversal simulation
    },
    unshiftContainer(listKey, nodes) {
      const arr = Array.isArray(nodes) ? nodes : [nodes];
      this.node.body.unshift(...arr);
    }
  };

  return path;
}

export function createVisitorContext(filename, options = {}) {
  return {
    opts: {
      cwd: process.cwd(),
      ...options
    },
    file: {
      opts: {
        filename
      }
    }
  };
}

export function simulatePluginExecution(pluginInstance, context, path) {
  if (!pluginInstance?.visitor?.Program) {
    throw new Error("Invalid plugin instance: missing Program visitor");
  }

  pluginInstance.visitor.Program.enter.call(context, path);
  pluginInstance.visitor.Program.exit.call(context, path);

  return {
    instrumented: Boolean(context.__dv__),
    nycConfig: context.nycConfig,
    body: path.node.body
  };
}
test/contract.mjs
import assert from "node:assert/strict";
import babelPluginIstanbulModule from "babel-plugin-istanbul";
import {
  babelPluginIstanbul,
  instantiatePlugin,
  createDefaultTypes,
  createMockProgramPath,
  createVisitorContext,
  simulatePluginExecution
} from "../src/index.mjs";

const rawPlugin =
  typeof babelPluginIstanbulModule === "function"
    ? babelPluginIstanbulModule
    : babelPluginIstanbulModule.default || babelPluginIstanbulModule;

// Contract 1: babel-plugin-istanbul default export is a Babel plugin function declaring Babel 7 compatibility
{
  assert.equal(typeof babelPluginIstanbul, "function");
  assert.equal(typeof rawPlugin, "function");

  let assertedVersion = null;
  const mockApi = {
    assertVersion: (v) => {
      assertedVersion = v;
    },
    types: createDefaultTypes()
  };

  const instance = rawPlugin(mockApi, {});
  assert.equal(assertedVersion, 7);
  assert.ok(instance && typeof instance === "object");
  assert.ok(instance.visitor);
}

// Contract 2: Plugin visitor exposes Program enter and exit lifecycle handlers
{
  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };

  const instance = instantiatePlugin(mockApi, {});
  assert.ok(instance.visitor.Program);
  assert.equal(typeof instance.visitor.Program.enter, "function");
  assert.equal(typeof instance.visitor.Program.exit, "function");
}

// Contract 3: Program visitor initializes NYC configuration with default and custom options
{
  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };
  const instance = instantiatePlugin(mockApi, {});

  const customOptions = {
    cwd: process.cwd(),
    include: ["src/**/*.js"],
    exclude: ["**/*.spec.js"],
    extension: [".js", ".jsx"]
  };

  const context = createVisitorContext(process.cwd() + "/src/sample.js", customOptions);
  const path = createMockProgramPath("src/sample.js");

  instance.visitor.Program.enter.call(context, path);
  assert.ok(context.nycConfig);
  assert.equal(context.nycConfig.cwd, process.cwd());
  assert.deepEqual(context.nycConfig.include, ["src/**/*.js"]);
  assert.deepEqual(context.nycConfig.exclude, ["**/*.spec.js"]);
  assert.deepEqual(context.nycConfig.extension, [".js", ".jsx"]);
}

// Contract 4: Program visitor respects include and exclude filter patterns to skip non-matching files
{
  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };

  // Matching file in include pattern: should be instrumented
  {
    const instance = instantiatePlugin(mockApi, {});
    const context = createVisitorContext(process.cwd() + "/src/feature.js", {
      cwd: process.cwd(),
      include: ["src/**/*.js"]
    });
    const path = createMockProgramPath("src/feature.js");
    const result = simulatePluginExecution(instance, context, path);
    assert.equal(result.instrumented, true);
    assert.ok(result.body.length > 0);
  }

  // Excluded file in exclude pattern: should be skipped
  {
    const instance = instantiatePlugin(mockApi, {});
    const context = createVisitorContext(process.cwd() + "/src/feature.spec.js", {
      cwd: process.cwd(),
      include: ["src/**/*.js"],
      exclude: ["**/*.spec.js"]
    });
    const path = createMockProgramPath("src/feature.spec.js");
    const result = simulatePluginExecution(instance, context, path);
    assert.equal(result.instrumented, false);
    assert.equal(result.body.length, 0);
  }

  // File outside include pattern: should be skipped
  {
    const instance = instantiatePlugin(mockApi, {});
    const context = createVisitorContext(process.cwd() + "/test/my-test.js", {
      cwd: process.cwd(),
      include: ["src/**/*.js"]
    });
    const path = createMockProgramPath("test/my-test.js");
    const result = simulatePluginExecution(instance, context, path);
    assert.equal(result.instrumented, false);
    assert.equal(result.body.length, 0);
  }

  // node_modules file: should be skipped by default node_modules exclusion
  {
    const instance = instantiatePlugin(mockApi, {});
    const context = createVisitorContext(process.cwd() + "/node_modules/dep/index.js", {
      cwd: process.cwd(),
      include: ["**/*.js"]
    });
    const path = createMockProgramPath("node_modules/dep/index.js");
    const result = simulatePluginExecution(instance, context, path);
    assert.equal(result.instrumented, false);
    assert.equal(result.body.length, 0);
  }
}

// Contract 5: Program visitor generates AST instrumentation and records coverage metrics on Program exit
{
  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };
  const instance = instantiatePlugin(mockApi, {});
  const filePath = process.cwd() + "/src/calculator.js";
  const context = createVisitorContext(filePath, {
    cwd: process.cwd(),
    include: ["src/**/*.js"]
  });
  const path = createMockProgramPath("src/calculator.js");

  instance.visitor.Program.enter.call(context, path);
  assert.ok(context.__dv__);

  const initialBodyCount = path.node.body.length;
  instance.visitor.Program.exit.call(context, path);

  // Program body should have prepended coverage template nodes
  assert.ok(path.node.body.length > initialBodyCount);
  const firstStatement = path.node.body[0];
  assert.ok(firstStatement);
}

// Contract 6: Program visitor invokes onCover callback with resolved file path and coverage metadata
{
  let onCoverCalled = false;
  let receivedFilename = null;
  let receivedCoverage = null;

  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };
  const instance = instantiatePlugin(mockApi, {});
  const filePath = process.cwd() + "/src/service.js";

  const context = createVisitorContext(filePath, {
    cwd: process.cwd(),
    include: ["src/**/*.js"],
    onCover: (filename, coverage) => {
      onCoverCalled = true;
      receivedFilename = filename;
      receivedCoverage = coverage;
    }
  });
  const path = createMockProgramPath("src/service.js");

  simulatePluginExecution(instance, context, path);

  assert.equal(onCoverCalled, true);
  assert.equal(receivedFilename, filePath);
  assert.ok(receivedCoverage);
  assert.equal(receivedCoverage.path, filePath);
  assert.ok(typeof receivedCoverage.statementMap === "object");
  assert.ok(typeof receivedCoverage.fnMap === "object");
  assert.ok(typeof receivedCoverage.branchMap === "object");
  assert.ok(typeof receivedCoverage.s === "object");
  assert.ok(typeof receivedCoverage.f === "object");
  assert.ok(typeof receivedCoverage.b === "object");
}

// Contract 7: Program visitor supports custom coverageVariable configuration
{
  let receivedCoverageVar = null;
  const mockApi = {
    assertVersion: () => {},
    types: createDefaultTypes()
  };
  const instance = instantiatePlugin(mockApi, {});
  const customVarName = "__CUSTOM_ISTANBUL_COVERAGE__";

  const context = createVisitorContext(process.cwd() + "/src/custom-var.js", {
    cwd: process.cwd(),
    include: ["src/**/*.js"],
    coverageVariable: customVarName,
    onCover: (filename, coverage) => {
      receivedCoverageVar = context.nycConfig?.coverageVariable;
    }
  });
  const path = createMockProgramPath("src/custom-var.js");

  simulatePluginExecution(instance, context, path);

  assert.equal(receivedCoverageVar, customVarName);
}

console.log("All babel-plugin-istanbul contract tests passed successfully.");

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