Uncaught TypeError: Cannot add property async, object is not extensible

[OmgImAlexis]

I keep getting Uncaught TypeError: Cannot add property async, object is not extensible when trying to pack my library with bili.

I hope I'm using the settings correctly. I'm trying to get my library to export a ES6 file and a normal and minified version of the file for browsers. I'm using yarn bili --format cjs,es,umd,umd-min --nodeResolve.preferBuiltins to bundle the files.

I'm using --nodeResolve.preferBuiltins as I use Buffer in my library and that fixes the issue of it not being mocked for the browser.

[egoist]

what's the actual code you're bundling? a minimal repo will help

[OmgImAlexis]

The current code is here. I believe the issue I had was caused by the async used here.

[egoist]

Hmm I don't get the error Uncaught TypeError: Cannot add property async, object is not extensible after removed the async plugin (which transforms async to generator which buble can't transform), just a bunch of warnings:

$ bili --moduleName Medusa --format cjs,es,umd,umd-min
⏳  Bundling 223 files: commonjs-proxy:/Users/egoist/dev/temp/medusa-lib/node_modules/qs/lib/parse.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 228 files: node_modules/iconv-lite/lib/index.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 231 files: node_modules/iconv-lite/encodings/internal.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 232 files: commonjs-external:buffer
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 232 files: commonjs-external:buffer
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable thi⏳  Bundling 233 files: commonjs-external:string_decoder
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable thi⏳  Bundling 233 files: commonjs-external:string_decoder
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'string_decoder' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/string_decoder/lib/string_decoder.js', pass 'preferBuiltins: false' to disable thi⏳  Bundling 234 files: node_modules/iconv-lite/encodings/utf16.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 235 files: node_modules/iconv-lite/encodings/utf7.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 236 files: node_modules/iconv-lite/encodings/sbcs-codec.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 239 files: node_modules/iconv-lite/encodings/dbcs-codec.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 265 files: node_modules/iconv-lite/lib/streams.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 267 files: node_modules/iconv-lite/lib/extend-node.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⏳  Bundling 314 files: commonjs-proxy:/Users/egoist/dev/temp/medusa-lib/node_modules/qs/lib/index.js
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins: true' to disable this warning
preferring built-in module 'buffer' over local alternative at '/Users/egoist/dev/temp/medusa-lib/node_modules/buffer/index.js', pass 'preferBuiltins: false' to disable this behavior or 'preferBuiltins⚠️  Using named and default exports together. Consumers of your bundle will have to use Medusa['default'] to access the default export, which may not be what you want. Use `exports: 'named'` to disable this warning
⚠️  Creating a browser bundle that depends on Node.js built-in modules ('buffer', 'url', 'http', 'https', 'zlib', 'stream', 'string_decoder', 'util' and 'tty'). You might need to include https://www.npmjs.com/package/rollup-plugin-node-builtins
⚠️  No name was provided for external module 'buffer' in options.globals – guessing 'require$$0'
⚠️  No name was provided for external module 'url' in options.globals – guessing 'require$$0$1'
⚠️  No name was provided for external module 'http' in options.globals – guessing 'http'
⚠️  No name was provided for external module 'https' in options.globals – guessing 'https'
⚠️  No name was provided for external module 'zlib' in options.globals – guessing 'zlib'
⚠️  No name was provided for external module 'stream' in options.globals – guessing 'require$$1'
⚠️  No name was provided for external module 'string_decoder' in options.globals – guessing 'require$$1$1'
⚠️  No name was provided for external module 'util' in options.globals – guessing 'util'
⚠️  No name was provided for external module 'tty' in options.globals – guessing 'tty'
⚠️  Using named and default exports together. Consumers of your bundle will have to use Medusa['default'] to access the default export, which may not be what you want. Use `exports: 'named'` to disable this warning
⚠️  Creating a browser bundle that depends on Node.js built-in modules ('buffer', 'url', 'http', 'https', 'zlib', 'stream', 'string_decoder', 'util' and 'tty'). You might need to include https://www.npmjs.com/package/rollup-plugin-node-builtins
⚠️  No name was provided for external module 'buffer' in options.globals – guessing 'require$$0'
⚠️  No name was provided for external module 'url' in options.globals – guessing 'require$$0$1'
⚠️  No name was provided for external module 'http' in options.globals – guessing 'http'
⚠️  No name was provided for external module 'https' in options.globals – guessing 'https'
⚠️  No name was provided for external module 'zlib' in options.globals – guessing 'zlib'
⚠️  No name was provided for external module 'stream' in options.globals – guessing 'require$$1'
⚠️  No name was provided for external module 'string_decoder' in options.globals – guessing 'require$$1$1'
⚠️  No name was provided for external module 'util' in options.globals – guessing 'util'
⚠️  No name was provided for external module 'tty' in options.globals – guessing 'tty'
✨  Built in 18.67s.
┌────────────────────────────────────────────┐
│file                    size       gzip size│
│dist/medusa-lib.cjs.js  301 B      149 B    │
│dist/medusa-lib.es.js   286 B      138 B    │
│dist/medusa-lib.js      978.81 KB  320.74 KB│
│dist/medusa-lib.min.js  308.91 KB  211.05 KB│
└────────────────────────────────────────────┘
✨  Done in 19.59s.

btw I should find a way to reduce duplicated warnings 😄

[OmgImAlexis]

I get it while using the dist/medusa-lib.min.js or dist/medusa-lib.js file in my browser. Sorry I should have mentioned that.

I was hoping they'd be browser ready without any other config.

[egoist]

Hmm I'm only getting Cannot read property 'Buffer' of undefined when using medusa-lib.js in browser

[OmgImAlexis]

Ah you missed the ending to that command. --nodeResolve.preferBuiltins.

Should I not be using that? One of my deps is what relies on Buffer so I don't exactly what to add it as a dep when my lib isn't using it directly.

[egoist]

@OmgImAlexis i do try that too, doesn't work either

[OmgImAlexis]

Any suggestions on how to get it bundling? I'm just trying to get a file I can include in a browser environment without needing babel.

[egoist]

@OmgImAlexis no idea until I get home 😄 you should also use es modules

[OmgImAlexis]

I need to be able to use ES5 since the project I'm working on is still using ES5 as it hasn't been migrated over to use Vue and Poi yet.

[OmgImAlexis]

@egoist any chance you could look at this when you're not busy?

[egoist]

hmm I can't really reproduce this, maybe a minimal repo? I mean without unrelated code.