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

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.

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{
  "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"
  }
}

{
  "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"
  ]
}

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
  };
}

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.");