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Tests for the browser field in package.json

Most JavaScript bundlers support a special bundler-specific field in package.json called browser. The idea is that this field lets you override certain import paths for node-specific code with browser-specific alternatives.

There is a "specification" for this field here: https://github.com/defunctzombie/package-browser-field-spec. However, the specification is abandoned, doesn't actually specify much, and comes without any tests. As a result, bundles implement this feature inconsistently leading to this feature breaking often in different situations.

This repository is a collection of some tests for this feature. The tests are not necessarily comprehensive. But they are better than nothing.

Positive Results

These tests are expected to pass. Each test is considered successful if the bundle is generated without errors and if the resulting bundle runs the code input.works = true.

Testesbuildwebpackbrowserifyparcelrollup
entry.js:
  require('foo')
package.json:
  { "browser": { "./foo": "./file" } }
file.js:
  input.works = true
✅ 🚫 ✅ 🚫 ✅ 
entry.js:
  require('foo')
package.json:
  { "browser": { "foo": "./file" } }
file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('./foo')
package.json:
  { "browser": { "./foo": "./file" } }
file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('./foo')
package.json:
  { "browser": { "foo": "./file" } }
file.js:
  input.works = true
✅ ✅ 🚫 🚫 🚫 
entry.js:
  require('pkg/foo/bar')
node_modules/pkg/package.json:
  { "browser": { "./foo/bar": "./file" } }
node_modules/pkg/foo/bar.js:
  invalid syntax
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg/foo/bar')
node_modules/pkg/package.json:
  { "browser": { "foo/bar": "./file" } }
node_modules/pkg/foo/bar.js:
  invalid syntax
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 🚫 🚫 
entry.js:
  require('pkg/foo/bar')
node_modules/pkg/package.json:
  { "browser": { "./foo/bar": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 ✅ 🚫 
entry.js:
  require('pkg/foo/bar')
node_modules/pkg/package.json:
  { "browser": { "foo/bar": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 🚫 🚫 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  require('foo/bar')
node_modules/pkg/package.json:
  { "browser": { "./foo/bar": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ 🚫 ✅ 🚫 ✅ 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  require('foo/bar')
node_modules/pkg/package.json:
  { "browser": { "foo/bar": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  throw 'fail'
node_modules/pkg/package.json:
  { "browser": { "./index.js": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "browser": { "./index.js": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  throw 'fail'
node_modules/pkg/package.json:
  { "browser": { "./index": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "browser": { "./index": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/main.js:
  throw 'fail'
node_modules/pkg/package.json:
  { "main": "./main",
    "browser": { "./main.js": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "main": "./main",
    "browser": { "./main.js": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ 🚫 ✅ 🚫 
entry.js:
  require('pkg')
package.json:
  { "browser": { "pkg2": "pkg3" } }
node_modules/pkg/index.js:
  require('pkg2')
node_modules/pkg/package.json:
  { "browser": { "pkg2": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg')
package.json:
  { "browser": { "pkg2": "pkg3" } }
node_modules/pkg/index.js:
  require('pkg2')
node_modules/pkg2/index.js:
  throw 'fail'
node_modules/pkg3/index.js:
  input.works = true
✅ ✅ ✅ 🚫 🚫 
entry.js:
  require('pkg')
package.json:
  { "browser": { "pkg2": "pkg3" } }
node_modules/pkg/index.js:
  require('pkg2')
node_modules/pkg/package.json:
  { "browser": { "./pkg2": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ 🚫 ✅ 🚫 🚫 
entry.js:
  require('pkg/dir')
node_modules/pkg/package.json:
  { "browser": { "./dir/index": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ 🚫 ✅ 🚫 🚫 
entry.js:
  require('pkg/dir')
node_modules/pkg/package.json:
  { "browser": { "./dir/index.js": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ 🚫 ✅ 🚫 🚫 
entry.js:
  require('pkg/dir')
node_modules/pkg/package.json:
  { "browser": { "./dir/index": "./file" } }
node_modules/pkg/dir/index.js:
  input.works = true
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg/dir')
node_modules/pkg/package.json:
  { "browser": { "./dir/index.js": "./file" } }
node_modules/pkg/dir/index.js:
  input.works = true
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg')
package.json:
  { "browser": { "./index.js": "./fail.js" } }
fail.js:
  throw 'fail'
node_modules/pkg/main.js:
  require('./lib')
node_modules/pkg/package.json:
  { "main": "main.js" }
node_modules/pkg/lib/index.js:
  input.works = true
node_modules/pkg/lib/fail.js:
  throw 'fail'
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "browser": { "./foo/bar.js": "./foo/baz" } }
node_modules/pkg/index.js:
  require('./foo/bar')
node_modules/pkg/foo/baz.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg/sub')
node_modules/pkg/package.json:
  { "browser": { "./sub": "./sub/foo.js" } }
node_modules/pkg/sub/foo.js:
  require('sub')
node_modules/sub/package.json:
  { "main": "./bar" }
node_modules/sub/bar.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg/sub')
node_modules/pkg/package.json:
  { "browser": {
    "./sub": "./sub/foo.js",
    "./sub/sub": "./sub/bar.js"
  } }
node_modules/pkg/sub/foo.js:
  require('sub')
node_modules/pkg/sub/bar.js:
  input.works = true
✅ 🚫 ✅ 🚫 🚫 
entry.js:
  require('pkg/sub')
node_modules/pkg/package.json:
  { "browser": {
    "./sub": "./sub/foo.js",
    "./sub/sub.js": "./sub/bar.js"
  } }
node_modules/pkg/sub/foo.js:
  require('sub')
node_modules/sub/index.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  require("./sub/foo")
node_modules/pkg/sub/bar.js:
  require("baz")
node_modules/pkg/package.json:
  { "browser": {
    "./sub/foo": "./sub/bar.js",
    "./sub/baz": "./sub/bat.js"
  } }
node_modules/pkg/sub/bat.js:
  input.works = true
node_modules/baz/index.js:
  invalid syntax
✅ 🚫 ✅ 🚫 🚫 
entry.js:
  require('pkg')
node_modules/pkg/index.js:
  require("./sub/foo")
node_modules/pkg/sub/bar.js:
  require("baz")
node_modules/pkg/package.json:
  { "browser": {
    "./sub/foo.js": "./sub/bar.js",
    "./sub/baz.js": "./sub/bat.js"
  } }
node_modules/pkg/sub/bat.js:
  invalid syntax
node_modules/baz/index.js:
  input.works = true
✅ ✅ ✅ ✅ 🚫
Percent handled: 100.0% 76.7% 73.3% 63.3% 23.3%

Negative Results

These tests are expected to fail. Each test is considered a failure if the bundle is generated without errors and if the resulting bundle runs the code input.works = true.

Testesbuildwebpackbrowserifyparcelrollup
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "browser": { ".": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('./foo.js')
package.json:
  { "browser": { "foo": "./file" } }
index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg/foo.js')
node_modules/pkg/package.json:
  { "browser": { "foo": "./file" } }
node_modules/pkg/index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('./foo.js')
package.json:
  { "browser": { "./foo": "./file" } }
index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg/foo.js')
node_modules/pkg/package.json:
  { "browser": { "./foo": "./file" } }
node_modules/pkg/index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
node_modules/pkg/main.js:
  throw 'fail'
node_modules/pkg/package.json:
  { "main": "./main.js",
    "browser": { "./main": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
node_modules/pkg/package.json:
  { "main": "./main.js",
    "browser": { "./main": "./file" } }
node_modules/pkg/file.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
package.json:
  { "browser": { "pkg2": "pkg3" } }
node_modules/pkg/index.js:
  require('pkg2')
node_modules/pkg/package.json:
  { "browser": {} }
node_modules/pkg2/index.js:
  throw 'fail'
node_modules/pkg3/index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅ 
entry.js:
  require('pkg')
package.json:
  { "browser": { "./pkg2": "pkg3" } }
node_modules/pkg/index.js:
  require('pkg2')
node_modules/pkg2/index.js:
  throw 'fail'
node_modules/pkg3/index.js:
  input.works = true
✅ ✅ ✅ ✅ ✅
Percent handled: 100.0% 100.0% 100.0% 100.0% 100.0%

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