es-module-lexer 2.3.1: ImportType

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 es-module-lexer.ImportType in pkg:npm/es-module-lexer@2.3.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/es-module-lexer@2.3.1
Demonstrate these symbols/APIs:
  - es-module-lexer.ImportType

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.

{"case":{"caseId":"case:sha256:137e81417c75d54b7bfc05c575ff6123cffa2c22c110d0723510f41a91bc6fa8","contract":["ImportType enum defines numeric discriminant values for Static (1), Dynamic (2), and ImportMeta (3)","ImportType enum defines phase imports for StaticSourcePhase (4), DynamicSourcePhase (5), StaticDeferPhase (6), and DynamicDeferPhase (7)","parse assigns ImportType.Static to static imports, ImportType.Dynamic to dynamic imports, and ImportType.ImportMeta to import.meta expressions","parse classifies source phase and defer phase imports with corresponding ImportType values"],"goal":"verify es-module-lexer.ImportType in pkg:npm/es-module-lexer@2.3.1","kind":"HOW","packages":["pkg:npm/es-module-lexer@2.3.1"],"schemaVersion":1,"symbols":["es-module-lexer.ImportType"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","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/es-module-lexer@2.3.1"],"schemaVersion":1,"subject":"pkg:npm/es-module-lexer@2.3.1","symbols":["es-module-lexer.ImportType"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-es-module-lexer",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-es-module-lexer",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "es-module-lexer": "2.3.1"
      }
    },
    "node_modules/es-module-lexer": {
      "version": "2.3.1",
      "resolved": "https://registry.npmjs.org/es-module-lexer/-/es-module-lexer-2.3.1.tgz",
      "integrity": "sha512-shc1dbU90Yl/xq1QrC7QRtfcwURZuVRfPhZbDoldJ1cn1gzDvBaBWlv0eFolj5+0znnPJz5TXLxsN77X/12KTA==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-es-module-lexer",
  "version": "1.0.0",
  "private": true,
  "description": "verify es-module-lexer.ImportType in pkg:npm/es-module-lexer@2.3.1",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "es-module-lexer": "2.3.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify es-module-lexer.ImportType in pkg:npm/es-module-lexer@2.3.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/es-module-lexer@2.3.1"
  ],
  "symbols": [
    "es-module-lexer.ImportType"
  ]
}

const { init, parse, ImportType } = require('es-module-lexer');

/**
 * Initializes the lexer and parses ES module source code,
 * returning the imports, exports, facade flag, and syntax flag.
 * @param {string} source - JavaScript/ESM source code to parse.
 * @param {string} [name] - Optional filename for error reporting.
 * @returns {Promise<[readonly any[], readonly any[], boolean, boolean]>}
 */
async function parseModule(source, name) {
  await init;
  return parse(source, name);
}

module.exports = {
  init,
  parse,
  ImportType,
  parseModule
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { init, parse, ImportType, parseModule } = require('../src/index.js');
const esModuleLexer = require('es-module-lexer');

// 1. ImportType enum defines numeric discriminant values for Static (1), Dynamic (2), and ImportMeta (3)
assert.strictEqual(typeof ImportType, 'object', 'ImportType must be defined');
assert.strictEqual(ImportType.Static, 1, 'ImportType.Static must be 1');
assert.strictEqual(ImportType.Dynamic, 2, 'ImportType.Dynamic must be 2');
assert.strictEqual(ImportType.ImportMeta, 3, 'ImportType.ImportMeta must be 3');
assert.strictEqual(ImportType[1], 'Static', 'Reverse mapping for 1 must be Static');
assert.strictEqual(ImportType[2], 'Dynamic', 'Reverse mapping for 2 must be Dynamic');
assert.strictEqual(ImportType[3], 'ImportMeta', 'Reverse mapping for 3 must be ImportMeta');
assert.strictEqual(esModuleLexer.ImportType.Static, 1, 'matches es-module-lexer export');

// 2. ImportType enum defines phase imports for StaticSourcePhase (4), DynamicSourcePhase (5), StaticDeferPhase (6), and DynamicDeferPhase (7)
assert.strictEqual(ImportType.StaticSourcePhase, 4, 'ImportType.StaticSourcePhase must be 4');
assert.strictEqual(ImportType.DynamicSourcePhase, 5, 'ImportType.DynamicSourcePhase must be 5');
assert.strictEqual(ImportType.StaticDeferPhase, 6, 'ImportType.StaticDeferPhase must be 6');
assert.strictEqual(ImportType.DynamicDeferPhase, 7, 'ImportType.DynamicDeferPhase must be 7');
assert.strictEqual(ImportType[4], 'StaticSourcePhase');
assert.strictEqual(ImportType[5], 'DynamicSourcePhase');
assert.strictEqual(ImportType[6], 'StaticDeferPhase');
assert.strictEqual(ImportType[7], 'DynamicDeferPhase');

// 3. parse assigns ImportType.Static to static imports, ImportType.Dynamic to dynamic imports, and ImportType.ImportMeta to import.meta expressions
await init;
const standardSource = `
  import defaultItem, { namedItem } from 'target-module';
  const dynamicModule = import('./lazy-module.js');
  const metaUrl = import.meta.url;
`;
const [standardImports] = await parseModule(standardSource);
assert.strictEqual(standardImports.length, 3, 'must detect 3 imports');

assert.strictEqual(standardImports[0].n, 'target-module');
assert.strictEqual(standardImports[0].t, ImportType.Static, 'static import t must be ImportType.Static');
assert.strictEqual(standardImports[0].d, -1);

assert.strictEqual(standardImports[1].n, './lazy-module.js');
assert.strictEqual(standardImports[1].t, ImportType.Dynamic, 'dynamic import t must be ImportType.Dynamic');
assert.ok(standardImports[1].d >= 0);

assert.strictEqual(standardImports[2].t, ImportType.ImportMeta, 'import.meta t must be ImportType.ImportMeta');
assert.strictEqual(standardImports[2].d, -2);

// 4. parse classifies source phase and defer phase imports with corresponding ImportType values
const phaseSource = `
  import source sourceMod from 'source-module';
  const dynamicSourceMod = import.source('dyn-source-module');
  import defer * as deferMod from 'defer-module';
  const dynamicDeferMod = import.defer('dyn-defer-module');
`;
const [phaseImports] = await parseModule(phaseSource);
assert.strictEqual(phaseImports.length, 4, 'must detect 4 phase imports');

assert.strictEqual(phaseImports[0].n, 'source-module');
assert.strictEqual(phaseImports[0].t, ImportType.StaticSourcePhase, 'static source import t must be ImportType.StaticSourcePhase');

assert.strictEqual(phaseImports[1].n, 'dyn-source-module');
assert.strictEqual(phaseImports[1].t, ImportType.DynamicSourcePhase, 'dynamic source import t must be ImportType.DynamicSourcePhase');

assert.strictEqual(phaseImports[2].n, 'defer-module');
assert.strictEqual(phaseImports[2].t, ImportType.StaticDeferPhase, 'static defer import t must be ImportType.StaticDeferPhase');

assert.strictEqual(phaseImports[3].n, 'dyn-defer-module');
assert.strictEqual(phaseImports[3].t, ImportType.DynamicDeferPhase, 'dynamic defer import t must be ImportType.DynamicDeferPhase');

console.log('All contract assertions passed.');