CodeSampleX

Sample

@babel/helper-create-regexp-features-plugin 7.29.7: transform dotAll regex flag with createRegExpFeaturePlugin

Verified sample for npm @babel/helper-create-regexp-features-plugin 7.29.7: transform dotAll regex flag with createRegExpFeaturePlugin. The contract ran on…

sha256:c167622a38445d97c75724bc964e2b6882249e684a90f280c3eb319905634e34

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
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

Case

HOW
Goal
transform dotAll regex flag with createRegExpFeaturePlugin
Packages
Symbols
  • createRegExpFeaturePlugin
Created
2026-08-27T12:38:27Z

Contract

  1. createRegExpFeaturePlugin exports a factory function for Babel regex feature plugins
  2. createRegExpFeaturePlugin returns a plugin object with name, manipulateOptions, pre, and visitor.RegExpLiteral
  3. Plugin pre() enables the specified feature bitflag and sets the version key on file context
  4. Plugin pre() enables additional unicodeFlag bitflag when useUnicodeFlag option is explicitly false
  5. RegExpLiteral visitor compiles dotAll regex pattern to match any character and removes the s flag
  6. RegExpLiteral visitor preserves regular expressions without the s flag unchanged
  7. Module helper simulateTransformation executes full plugin lifecycle to transform dotAll regular expressions

Files

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

Download the source artifact (tar.gz)

Source

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: transform dotAll regex flag with createRegExpFeaturePlugin
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/helper-create-regexp-features-plugin@7.29.7
Demonstrate these symbols/APIs:
  - createRegExpFeaturePlugin

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
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package-lock.json
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package.json
{
  "name": "sample-babel-helper-create-regexp-features-plugin",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/helper-create-regexp-features-plugin": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "transform dotAll regex flag with createRegExpFeaturePlugin",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/helper-create-regexp-features-plugin@7.29.7"
  ],
  "symbols": [
    "createRegExpFeaturePlugin"
  ]
}
src/index.mjs
import helperPkg from "@babel/helper-create-regexp-features-plugin";

export const createRegExpFeaturePlugin =
  helperPkg.createRegExpFeaturePlugin ||
  helperPkg.default?.createRegExpFeaturePlugin ||
  helperPkg;

export function instantiatePlugin({
  name = "transform-dot-all-regex",
  feature = "dotAllFlag",
  options = {},
  manipulateOptions = () => {}
} = {}) {
  return createRegExpFeaturePlugin({
    name,
    feature,
    options,
    manipulateOptions
  });
}

export function createFileContext(initialEntries = {}) {
  const store = new Map(Object.entries(initialEntries));
  return {
    get(key) {
      return store.get(key);
    },
    set(key, value) {
      store.set(key, value);
    },
    has(key) {
      return store.has(key);
    },
    _store: store
  };
}

export function applyPluginPre(pluginInstance, file) {
  if (typeof pluginInstance?.pre === "function") {
    pluginInstance.pre.call({ file });
  }
}

export function transformRegExpLiteral(pluginInstance, file, path, helpers = {}) {
  if (!pluginInstance?.visitor?.RegExpLiteral) {
    throw new Error("Invalid plugin instance: missing visitor.RegExpLiteral");
  }
  const thisContext = {
    file,
    addHelper: (name) => {
      if (typeof helpers.addHelper === "function") {
        return helpers.addHelper(name);
      }
      return { type: "Identifier", name };
    }
  };
  return pluginInstance.visitor.RegExpLiteral.call(thisContext, path);
}

export function simulateTransformation({
  pattern,
  flags = "",
  feature = "dotAllFlag",
  name = "transform-dot-all-regex",
  options = {},
  manipulateOptions = () => {},
  isTest = false
} = {}) {
  const instance = instantiatePlugin({
    name,
    feature,
    options,
    manipulateOptions
  });
  const file = createFileContext();
  applyPluginPre(instance, file);

  const node = {
    type: "RegExpLiteral",
    pattern,
    flags
  };

  let replacedNode = null;
  const path = {
    node,
    parentPath: {
      isMemberExpression: ({ object, computed }) =>
        isTest && object === node && computed === false,
      get: (prop) => ({
        isIdentifier: ({ name }) => isTest && prop === "property" && name === "test"
      })
    },
    replaceWith(newNode) {
      replacedNode = newNode;
    }
  };

  transformRegExpLiteral(instance, file, path);

  return {
    instance,
    file,
    node,
    replacedNode,
    finalPattern: node.pattern,
    finalFlags: node.flags
  };
}
test/contract.mjs
import assert from "node:assert/strict";
import helperPkg from "@babel/helper-create-regexp-features-plugin";
import {
  createRegExpFeaturePlugin,
  instantiatePlugin,
  createFileContext,
  applyPluginPre,
  transformRegExpLiteral,
  simulateTransformation
} from "../src/index.mjs";

const rawFactory =
  helperPkg.createRegExpFeaturePlugin ||
  helperPkg.default?.createRegExpFeaturePlugin ||
  helperPkg;

// Contract 1: createRegExpFeaturePlugin exports a factory function for Babel regex feature plugins
{
  assert.equal(typeof createRegExpFeaturePlugin, "function");
  assert.equal(typeof rawFactory, "function");
}

// Contract 2: createRegExpFeaturePlugin returns a plugin object with name, manipulateOptions, pre, and visitor.RegExpLiteral
{
  const customManipulate = () => {};
  const plugin = instantiatePlugin({
    name: "transform-dot-all-regex",
    feature: "dotAllFlag",
    manipulateOptions: customManipulate
  });

  assert.equal(plugin.name, "transform-dot-all-regex");
  assert.equal(plugin.manipulateOptions, customManipulate);
  assert.equal(typeof plugin.pre, "function");
  assert.ok(plugin.visitor);
  assert.equal(typeof plugin.visitor.RegExpLiteral, "function");
}

// Contract 3: Plugin pre() enables the specified feature bitflag and sets the version key on file context
{
  const plugin = instantiatePlugin({
    name: "transform-dot-all-regex",
    feature: "dotAllFlag"
  });
  const file = createFileContext();
  applyPluginPre(plugin, file);

  const featuresKey = "@babel/plugin-regexp-features/featuresKey";
  const versionKey = "@babel/plugin-regexp-features/version";

  assert.ok(file.has(featuresKey));
  assert.equal(file.get(featuresKey), 2); // 1 << 1 for dotAllFlag
  assert.equal(file.get(versionKey), "7.29.7");
}

// Contract 4: Plugin pre() enables additional unicodeFlag bitflag when useUnicodeFlag option is explicitly false
{
  const plugin = instantiatePlugin({
    name: "transform-dot-all-regex",
    feature: "dotAllFlag",
    options: { useUnicodeFlag: false }
  });
  const file = createFileContext();
  applyPluginPre(plugin, file);

  const featuresKey = "@babel/plugin-regexp-features/featuresKey";
  // dotAllFlag (2) | unicodeFlag (1) = 3
  assert.equal(file.get(featuresKey), 3);
}

// Contract 5: RegExpLiteral visitor compiles dotAll regex pattern to match any character and removes the s flag
{
  const result = simulateTransformation({
    pattern: "hello.world",
    flags: "s",
    feature: "dotAllFlag"
  });

  assert.equal(result.finalPattern, "hello[^]world");
  assert.equal(result.finalFlags, "");
  assert.equal(result.replacedNode, null);
}

// Contract 6: RegExpLiteral visitor preserves regular expressions without the s flag unchanged
{
  const result = simulateTransformation({
    pattern: "hello.world",
    flags: "g",
    feature: "dotAllFlag"
  });

  assert.equal(result.finalPattern, "hello.world");
  assert.equal(result.finalFlags, "g");
  assert.equal(result.replacedNode, null);
}

// Contract 7: Module helper simulateTransformation executes full plugin lifecycle to transform dotAll regular expressions
{
  const result = simulateTransformation({
    pattern: "^start.*end$",
    flags: "ims",
    feature: "dotAllFlag"
  });

  assert.equal(result.finalPattern, "^start[^]*end$");
  assert.equal(result.finalFlags, "im");
}

console.log("All @babel/helper-create-regexp-features-plugin contract tests passed successfully.");

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