source-map 0.6.1: 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: verify source-map.SourceMapConsumer in pkg:npm/source-map@0.6.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/source-map@0.6.1
Demonstrate these symbols/APIs:
  - source-map.SourceMapConsumer

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:f6f7a4f31aee60da6579456ccac44df06465bcb249b1fa5e17fe3f23a971c08d","contract":["SourceMapConsumer parses raw source map and resolves original position for a generated coordinate","SourceMapConsumer resolves original position with GREATEST_LOWER_BOUND and LEAST_UPPER_BOUND bias options","SourceMapConsumer resolves generated position for an original source line and column","SourceMapConsumer returns all generated positions matching an original source line","SourceMapConsumer retrieves embedded source content by file name","SourceMapConsumer iterates over mappings in GENERATED_ORDER and ORIGINAL_ORDER","SourceMapConsumer checks whether contents are embedded for all source files"],"goal":"verify source-map.SourceMapConsumer in pkg:npm/source-map@0.6.1","kind":"HOW","packages":["pkg:npm/source-map@0.6.1"],"schemaVersion":1,"symbols":["source-map.SourceMapConsumer"]},"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/source-map@0.6.1"],"schemaVersion":1,"subject":"pkg:npm/source-map@0.6.1","symbols":["source-map.SourceMapConsumer"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-source-map-consumer",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-source-map-consumer",
      "version": "1.0.0",
      "dependencies": {
        "source-map": "0.6.1"
      }
    },
    "node_modules/source-map": {
      "version": "0.6.1",
      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
      "license": "BSD-3-Clause",
      "engines": {
        "node": ">=0.10.0"
      }
    }
  }
}

{
  "name": "sample-source-map-consumer",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "source-map": "0.6.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify source-map.SourceMapConsumer in pkg:npm/source-map@0.6.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/source-map@0.6.1"
  ],
  "symbols": [
    "source-map.SourceMapConsumer"
  ]
}

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

function createFixtureSourceMap() {
  const generator = new SourceMapGenerator({
    file: 'bundle.min.js'
  });

  generator.setSourceContent('util.js', 'export function add(a, b) {\n  return a + b;\n}\n');
  generator.setSourceContent('main.js', 'import { add } from "./util";\nconst sum = add(1, 2);\n');

  // Mapping 1: util.js add function definition
  generator.addMapping({
    generated: { line: 1, column: 0 },
    original: { line: 1, column: 0 },
    source: 'util.js',
    name: 'add'
  });

  // Mapping 2: util.js return statement
  generator.addMapping({
    generated: { line: 1, column: 20 },
    original: { line: 2, column: 2 },
    source: 'util.js'
  });

  // Mapping 3: main.js import
  generator.addMapping({
    generated: { line: 2, column: 0 },
    original: { line: 1, column: 0 },
    source: 'main.js'
  });

  // Mapping 4: main.js sum assignment
  generator.addMapping({
    generated: { line: 2, column: 15 },
    original: { line: 2, column: 6 },
    source: 'main.js',
    name: 'sum'
  });

  // Mapping 5: main.js call to add on same line
  generator.addMapping({
    generated: { line: 2, column: 25 },
    original: { line: 2, column: 12 },
    source: 'main.js',
    name: 'add'
  });

  return generator.toJSON();
}

const rawMap = createFixtureSourceMap();

// 1. SourceMapConsumer parses raw source map and resolves original position for a generated coordinate
{
  const consumer = new SourceMapConsumer(rawMap);
  const pos = consumer.originalPositionFor({ line: 2, column: 15 });
  assert.equal(pos.source, 'main.js');
  assert.equal(pos.line, 2);
  assert.equal(pos.column, 6);
  assert.equal(pos.name, 'sum');
}

// 2. SourceMapConsumer resolves original position with GREATEST_LOWER_BOUND and LEAST_UPPER_BOUND bias options
{
  const consumer = new SourceMapConsumer(rawMap);
  // Column 18 is between mapping at col 15 and col 25 on line 2
  const lowerPos = consumer.originalPositionFor({
    line: 2,
    column: 18,
    bias: SourceMapConsumer.GREATEST_LOWER_BOUND
  });
  assert.equal(lowerPos.line, 2);
  assert.equal(lowerPos.column, 6);
  assert.equal(lowerPos.name, 'sum');

  const upperPos = consumer.originalPositionFor({
    line: 2,
    column: 18,
    bias: SourceMapConsumer.LEAST_UPPER_BOUND
  });
  assert.equal(upperPos.line, 2);
  assert.equal(upperPos.column, 12);
  assert.equal(upperPos.name, 'add');
}

// 3. SourceMapConsumer resolves generated position for an original source line and column
{
  const consumer = new SourceMapConsumer(rawMap);
  const genPos = consumer.generatedPositionFor({
    source: 'util.js',
    line: 2,
    column: 2
  });
  assert.equal(genPos.line, 1);
  assert.equal(genPos.column, 20);
}

// 4. SourceMapConsumer returns all generated positions matching an original source line
{
  const consumer = new SourceMapConsumer(rawMap);
  const allPositions = consumer.allGeneratedPositionsFor({
    source: 'main.js',
    line: 2
  });
  assert.ok(Array.isArray(allPositions));
  assert.equal(allPositions.length, 2);
  assert.equal(allPositions[0].line, 2);
  assert.equal(allPositions[0].column, 15);
  assert.equal(allPositions[1].line, 2);
  assert.equal(allPositions[1].column, 25);
}

// 5. SourceMapConsumer retrieves embedded source content by file name
{
  const consumer = new SourceMapConsumer(rawMap);
  const utilContent = consumer.sourceContentFor('util.js');
  assert.equal(utilContent, 'export function add(a, b) {\n  return a + b;\n}\n');

  const mainContent = consumer.sourceContentFor('main.js');
  assert.equal(mainContent, 'import { add } from "./util";\nconst sum = add(1, 2);\n');

  const missingContent = consumer.sourceContentFor('nonexistent.js', true);
  assert.equal(missingContent, null);
}

// 6. SourceMapConsumer iterates over mappings in GENERATED_ORDER and ORIGINAL_ORDER
{
  const consumer = new SourceMapConsumer(rawMap);
  const genOrderMappings = [];
  consumer.eachMapping((m) => {
    genOrderMappings.push({ genLine: m.generatedLine, genCol: m.generatedColumn });
  }, null, SourceMapConsumer.GENERATED_ORDER);

  assert.equal(genOrderMappings.length, 5);
  assert.deepEqual(genOrderMappings[0], { genLine: 1, genCol: 0 });
  assert.deepEqual(genOrderMappings[1], { genLine: 1, genCol: 20 });
  assert.deepEqual(genOrderMappings[2], { genLine: 2, genCol: 0 });

  const origOrderMappings = [];
  consumer.eachMapping((m) => {
    origOrderMappings.push({ source: m.source, origLine: m.originalLine, origCol: m.originalColumn });
  }, null, SourceMapConsumer.ORIGINAL_ORDER);

  assert.equal(origOrderMappings.length, 5);
  assert.equal(origOrderMappings[0].source, 'util.js');
  assert.equal(origOrderMappings[0].origLine, 1);
  assert.equal(origOrderMappings[0].origCol, 0);
}

// 7. SourceMapConsumer checks whether contents are embedded for all source files
{
  const consumer = new SourceMapConsumer(rawMap);
  assert.equal(consumer.hasContentsOfAllSources(), true);

  const partialMap = {
    version: 3,
    file: 'out.js',
    sources: ['a.js', 'b.js'],
    sourcesContent: ['content a', null],
    names: [],
    mappings: 'AAAA;'
  };
  const partialConsumer = new SourceMapConsumer(partialMap);
  assert.equal(partialConsumer.hasContentsOfAllSources(), false);
}