2022/10/10 Workers Runtime Release Notes

[harris]

Changes last week:

• Fixed a bug where if an ES-modules-syntax script exported an array-typed value from the top-level module, the upload API would refuse it with a 500 error.
• console.log now prints more information about certain objects, for example Promises.
• The Workers Runtime is now built from the Open Source code in: GitHub - cloudflare/workerd: The JavaScript / Wasm runtime that powers Cloudflare Workers

[eidam]

hey harris

• console.log now prints more information about certain objects, for example Promises.

what does this one mean exactly? what would console.log print if I pass it a Promise?

[jlee]

Before, console.log(promise) would log the result of serializing promise to JSON, which is an empty JS object: {}. Now, for values that serialize to JSON as empty objects but are not themselves empty objects, console.log() falls back to serializing the value to a string, so console.log(promise) would instead log the string "[object Promise]". Hopefully, this is more informative during debugging than the previous behavior.

[eidam]

thank you - gotcha, and agree, very useful!