@jridgewell/source-map 0.3.11: generate and consume source maps with SourceMapGenerator and SourceMapConsumer

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: generate and consume source maps with SourceMapGenerator and SourceMapConsumer
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jridgewell/source-map@0.3.11
Demonstrate these symbols/APIs:
  - SourceMapConsumer
  - SourceMapGenerator

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:cbd03d708bf1f1fcfb6144c4ef3b5578df3f1dec78c10b972a9ba977d05dd5aa","contract":["SourceMapGenerator generates v3 source map with mappings and embedded sourcesContent","SourceMapConsumer resolves originalPositionFor with mapped line column and symbol name","SourceMapConsumer resolves generatedPositionFor matching original line and column","SourceMapConsumer retrieves original source code via sourceContentFor"],"goal":"generate and consume source maps with SourceMapGenerator and SourceMapConsumer","kind":"HOW","packages":["pkg:npm/%40jridgewell/source-map@0.3.11"],"schemaVersion":1,"symbols":["SourceMapConsumer","SourceMapGenerator"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40jridgewell/source-map@0.3.11"],"schemaVersion":1,"subject":"pkg:npm/%40jridgewell/source-map@0.3.11","symbols":["SourceMapConsumer","SourceMapGenerator"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-source-map",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-source-map",
      "version": "1.0.0",
      "dependencies": {
        "@jridgewell/source-map": "0.3.11"
      }
    },
    "node_modules/@jridgewell/gen-mapping": {
      "version": "0.3.13",
      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
      "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
      "license": "MIT",
      "dependencies": {
        "@jridgewell/sourcemap-codec": "^1.5.0",
        "@jridgewell/trace-mapping": "^0.3.24"
      }
    },
    "node_modules/@jridgewell/resolve-uri": {
      "version": "3.1.2",
      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
      "license": "MIT",
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/@jridgewell/source-map": {
      "version": "0.3.11",
      "resolved": "https://registry.npmjs.org/@jridgewell/source-map/-/source-map-0.3.11.tgz",
      "integrity": "sha512-ZMp1V8ZFcPG5dIWnQLr3NSI1MiCU7UETdS/A0G8V/XWHvJv3ZsFqutJn1Y5RPmAPX6F3BiE397OqveU/9NCuIA==",
      "license": "MIT",
      "dependencies": {
        "@jridgewell/gen-mapping": "^0.3.5",
        "@jridgewell/trace-mapping": "^0.3.25"
      }
    },
    "node_modules/@jridgewell/sourcemap-codec": {
      "version": "1.5.5",
      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
      "integrity": "sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==",
      "license": "MIT"
    },
    "node_modules/@jridgewell/trace-mapping": {
      "version": "0.3.31",
      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
      "license": "MIT",
      "dependencies": {
        "@jridgewell/resolve-uri": "^3.1.0",
        "@jridgewell/sourcemap-codec": "^1.4.14"
      }
    }
  }
}

{
  "name": "sample-source-map",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "@jridgewell/source-map": "0.3.11"
  }
}

{
  "schemaVersion": 1,
  "goal": "generate and consume source maps with SourceMapGenerator and SourceMapConsumer",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jridgewell/source-map@0.3.11"
  ],
  "symbols": [
    "SourceMapConsumer",
    "SourceMapGenerator"
  ]
}

import assert from 'node:assert/strict';
import { SourceMapGenerator, SourceMapConsumer } from '@jridgewell/source-map';

// 1. Generate source map with SourceMapGenerator
const generator = new SourceMapGenerator({
  file: 'bundle.js',
  sourceRoot: 'https://example.com/src/'
});

const originalCode = 'function hello() {\n  console.log("world");\n}\n';
generator.setSourceContent('hello.js', originalCode);

generator.addMapping({
  source: 'hello.js',
  original: { line: 2, column: 2 },
  generated: { line: 1, column: 18 },
  name: 'console'
});

const rawMap = generator.toJSON();

assert.equal(rawMap.version, 3);
assert.equal(rawMap.file, 'bundle.js');
assert.equal(rawMap.sourceRoot, 'https://example.com/src/');
assert.deepEqual(rawMap.sources, ['hello.js']);
assert.deepEqual(rawMap.sourcesContent, [originalCode]);
assert.ok(typeof rawMap.mappings === 'string');

// 2. Query original position with SourceMapConsumer
const consumer = new SourceMapConsumer(rawMap);

const origPos = consumer.originalPositionFor({ line: 1, column: 18 });
assert.equal(origPos.source, 'https://example.com/src/hello.js');
assert.equal(origPos.line, 2);
assert.equal(origPos.column, 2);
assert.equal(origPos.name, 'console');

// 3. Query generated position with SourceMapConsumer
const genPos = consumer.generatedPositionFor({
  source: 'hello.js',
  line: 2,
  column: 2
});
assert.equal(genPos.line, 1);
assert.equal(genPos.column, 18);

// 4. Retrieve source content with SourceMapConsumer
const retrievedSource = consumer.sourceContentFor('hello.js');
assert.equal(retrievedSource, originalCode);

consumer.destroy();
console.log('Contract passed');