table.md

Import behavior matrix

What is available as a result of import * as namespace from "x.cjs"

❌ - missing
☑ - own property, but falsy
✔️ - truthy

	endo	node-v12	node-v12	node-v16	node-v20	bun	esbuild	parcel	rollup	tsc	tscInterop	webpack
1.cjs even	✔️	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
1.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
1.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
2.cjs even	✔️	❌	❌	❌	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️
2.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
2.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
3.cjs even	❌	❌	❌	❌	❌	✔️	✔️	✔️	❌	✔️	❌	✔️
3.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
3.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
4.cjs even	✔️	❌	❌	❌	❌	✔️	✔️	✔️	❌	✔️	❌	✔️
4.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
4.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
5.cjs even	✔️	❌	❌	❌	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️
5.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
5.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
6.cjs even	✔️	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌
6.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
6.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
7.cjs even	☑	❌	☑	☑	☑	❌	❌	❌	❌	❌	❌	❌
7.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	❌	❌	✔️	✔️
7.cjs default.even	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
8.cjs even	✔️	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
8.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
8.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	☑	✔️	☑	✔️	✔️
9.cjs even	❌	❌	❌	❌	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️
9.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	❌	✔️
9.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	❌	✔️
10.cjs even	❌	❌	❌	❌	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️
10.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	❌	✔️
10.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	❌	✔️
11.cjs even	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌	❌
11.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
11.cjs default.even	❌	❌	❌	❌	❌	✔️	❌	✔️	✔️	✔️	✔️	❌
12.cjs even	✔️	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
12.cjs default	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	❌	❌	✔️
12.cjs default.even	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	❌	❌	✔️
13.cjs even	☑	❌	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
13.cjs default	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
13.cjs default.even	✔️	✔️	✔️	✔️	✔️	✔️	✔️	❌	✔️	❌	✔️	✔️
	endo	node-v12	node-v12	node-v16	node-v20	bun	esbuild	parcel	rollup	tsc	tscInterop	webpack

Matching results

• 2,5,
• 9,10

Cases

file 1.cjs

module.exports = {
  even: n => n % 2 === 0
};

file 2.cjs

module.exports = {
  version: '1.1.0',
  even: n => n % 2 === 0
};

file 3.cjs

let o = Object.create({ even: n => n % 2 === 0 })
module.exports = o;

file 4.cjs

Object.defineProperty(exports, 'even', {
  enumerable: false,
  value: n => n % 2 === 0
})

file 5.cjs

const api = {
  version: '1.1.0',
  even: n => n % 2 === 0,
}
module.exports = api

file 6.cjs

const even = n => n % 2 === 0;

// "The Infamous Triplet"
module.exports = even
module.exports.even = even
module.exports.default = even

file 7.cjs

if (false) {
    exports.even = true
}

file 8.cjs

const even = n => n % 2 === 0;

module.exports = {
    even,
    default: { even: false }
}

file 9.cjs

'use strict';
// derived from real package
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __exportStar = (this && this.__exportStar) || function(m, exports) {
    for (var p in m) if (p !== "default" && !exports.hasOwnProperty(p)) __createBinding(exports, m, p);
};
Object.defineProperty(exports, '__esModule', { value: true });
const stuff = { even: n => n % 2 === 0 };
__exportStar(stuff, exports);

file 10.cjs

'use strict';
// derived from real package
var letsCallItSomethingElse = exports;
function defineThingy(name) {
  Object.defineProperty(letsCallItSomethingElse, name, {
    configurable: true,
    enumerable: true,
    get: function() {
      Object.defineProperty(letsCallItSomethingElse, name, {
        configurable: true,
        enumerable: true,
        value: true
      });
      return true
    },
  });
}
defineThingy('even')

file 11.cjs

exports.__esModule = true;
exports.default = {
  even: n => n % 2 === 0
};

file 12.cjs

// should be exactly the same as 9
exports.__esModule = true;
exports.even = n => n % 2 === 0

file 13.cjs

//popular shape of typescript output for reexports
const ex = require('./1.cjs');
Object.defineProperty(exports, 'even', {
  enumerable: true,
  get() {
    return ex.even
  }
});

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<style> /* these are useful locally */ tr:nth-child(3n+1){ border-top:2px solid #333 !important; } td:nth-child(n+1){ background-color: #eee !important; } </style>