node-source-map-support/test.js

require('./source-map-support').install();

var SourceMapGenerator = require('source-map').SourceMapGenerator;
var child_process = require('child_process');
var assert = require('assert');
var fs = require('fs');

function compareStackTrace(source, expected) {
  var sourceMap = new SourceMapGenerator({
    file: '.generated.js',
    sourceRoot: '.'
  });
  for (var i = 1; i <= 100; i++) {
    sourceMap.addMapping({
      generated: { line: i, column: 1 },
      original: { line: 1000 + i, column: 100 + i },
      source: 'line' + i + '.js'
    });
  }
  fs.writeFileSync('.generated.js.map', sourceMap);
  fs.writeFileSync('.generated.js', 'exports.test = function() {' +
    source.join('\n') + '};//@ sourceMappingURL=.generated.js.map');
  try {
    delete require.cache[require.resolve('./.generated')];
    require('./.generated').test();
  } catch (e) {
    expected = expected.join('\n');
    assert.equal(e.stack.slice(0, expected.length), expected);
  }
  fs.unlinkSync('.generated.js');
  fs.unlinkSync('.generated.js.map');
}

function compareStdout(done, source, expected) {
  var sourceMap = new SourceMapGenerator({
    file: '.generated.js',
    sourceRoot: '.'
  });
  sourceMap.addMapping({
    generated: { line: 1, column: 1 },
    original: { line: 1, column: 1 },
    source: '.original.js'
  });
  fs.writeFileSync('.original.js', 'this is the original code');
  fs.writeFileSync('.generated.js.map', sourceMap);
  fs.writeFileSync('.generated.js', source.join('\n') +
    '//@ sourceMappingURL=.generated.js.map');
  child_process.exec('node ./.generated', function(error, stdout, stderr) {
    expected = expected.join('\n');
    try {
      assert.equal((stdout + stderr).slice(0, expected.length), expected);
    } catch (e) {
      return done(e);
    }
    fs.unlinkSync('.generated.js');
    fs.unlinkSync('.generated.js.map');
    fs.unlinkSync('.original.js');
    done();
  });
}

it('normal throw', function() {
  compareStackTrace([
    'throw new Error("test");'
  ], [
    'Error: test',
    '    at Object.exports.test (./line1.js:1001:101)'
  ]);
});

it('throw inside function', function() {
  compareStackTrace([
    'function foo() {',
    '  throw new Error("test");',
    '}',
    'foo();'
  ], [
    'Error: test',
    '    at foo (./line2.js:1002:102)',
    '    at Object.exports.test (./line4.js:1004:104)'
  ]);
});

it('throw inside function inside function', function() {
  compareStackTrace([
    'function foo() {',
    '  function bar() {',
    '    throw new Error("test");',
    '  }',
    '  bar();',
    '}',
    'foo();'
  ], [
    'Error: test',
    '    at bar (./line3.js:1003:103)',
    '    at foo (./line5.js:1005:105)',
    '    at Object.exports.test (./line7.js:1007:107)'
  ]);
});

it('eval', function() {
  compareStackTrace([
    'eval("throw new Error(\'test\')");'
  ], [
    'Error: test',
    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
    '    at Object.exports.test (./line1.js:1001:101)'
  ]);
});

it('eval inside eval', function() {
  compareStackTrace([
    'eval("eval(\'throw new Error(\\"test\\")\')");'
  ], [
    'Error: test',
    '    at Object.eval (eval at <anonymous> (eval at <anonymous> (./line1.js:1001:101)))',
    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
    '    at Object.exports.test (./line1.js:1001:101)'
  ]);
});

it('eval inside function', function() {
  compareStackTrace([
    'function foo() {',
    '  eval("throw new Error(\'test\')");',
    '}',
    'foo();'
  ], [
    'Error: test',
    '    at eval (eval at foo (./line2.js:1002:102))',
    '    at foo (./line2.js:1002:102)',
    '    at Object.exports.test (./line4.js:1004:104)'
  ]);
});

it('eval with sourceURL', function() {
  compareStackTrace([
    'eval("throw new Error(\'test\')//@ sourceURL=sourceURL.js");'
  ], [
    'Error: test',
    '    at Object.eval (sourceURL.js:1:7)',
    '    at Object.exports.test (./line1.js:1001:101)'
  ]);
});

it('eval with sourceURL inside eval', function() {
  compareStackTrace([
    'eval("eval(\'throw new Error(\\"test\\")//@ sourceURL=sourceURL.js\')");'
  ], [
    'Error: test',
    '    at Object.eval (sourceURL.js:1:7)',
    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
    '    at Object.exports.test (./line1.js:1001:101)'
  ]);
});

it('default options', function(done) {
  compareStdout(done, [
    '',
    'function foo() { throw new Error("this is the error"); }',
    'require("./source-map-support").install();',
    'process.nextTick(foo);',
    'process.nextTick(function() { process.exit(1); });'
  ], [
    '',
    './.original.js:1',
    'this is the original code',
    '^',
    'Error: this is the error',
    '    at foo (./.original.js:1:1)'
  ]);
});

it('handleUncaughtExceptions is true', function(done) {
  compareStdout(done, [
    '',
    'function foo() { throw new Error("this is the error"); }',
    'require("./source-map-support").install({ handleUncaughtExceptions: true });',
    'process.nextTick(foo);'
  ], [
    '',
    './.original.js:1',
    'this is the original code',
    '^',
    'Error: this is the error',
    '    at foo (./.original.js:1:1)'
  ]);
});

it('handleUncaughtExceptions is false', function(done) {
  compareStdout(done, [
    '',
    'function foo() { throw new Error("this is the error"); }',
    'require("./source-map-support").install({ handleUncaughtExceptions: false });',
    'process.nextTick(foo);'
  ], [
    '',
    __dirname + '/.generated.js:2',
    'function foo() { throw new Error("this is the error"); }',
    '                       ^',
    'Error: this is the error',
    '    at foo (./.original.js:1:1)'
  ]);
});