Design Meeting 2021-09-09

[kitsonk]

Deno 2.0 Scope Discussion

We dedicated this meeting to discussing tentative Deno 2.0 discussion. Based on the discussion we feel we are still looking at doing a 2.0 release in November. Prior to the meeting we had collected candidate items, and the process we followed in the meeting:

• "Owner" briefly introduced the candidate item so that everyone had a shared understanding.
• We added any last minute entries.
• We voted against the items to prioritise the order of discussion.
• We mapped each item in order of priority against low and high value and desirability versus low and high effort, planning to focus on those things that had high value/desirability and low effort.

Based on that, we have the following scope items we are considering for Deno 2.0 at this point. Note this is a working list, it is subject to change as some of the features get refined, scoped and investigated:

• Move JavaScript only "stuff" out of the Deno Namespace (Remove pure JS (non native) io functions from Deno namespace #9795)
• Enable Deno namespace by default in workers (Enable Deno namespace by default in Workers #8174)
• Don't type check be default (Skip type checking by default #11340)
• New subprocess API (Implement new two-tier subprocess API #11016, Detached processes in deno #5501, feat(runtime): two-tier subprocess API #11618)
• Turn TypeScript useUnknownInCatchVariables on (Enable "useUnknownInCatchVariables" for TypeScript by default #11826)
• Remove deprecated Deno.customInspect (Remove Deno.customInspect symbol at 2.0 #10929)
• Lockfile generated by default (Lockfile should be written by default #11971)
• Switch JSX/TSX default constructors (Proposal: [breaking-change] Default to h and Fragment for JSX #11186)
• Have a single configuration for TypeScript (Proposal: Remove ability to specify TypeScript compile options #7732)
• Internal Origin for Persistance (Internal Origin for Persistence #11882)
• Don't report check diagnostics for external scripts by default (Don't report diagnostics for "external" TypeScript code #11970)
• Use --allow-import for dynamic imports and workers (Proposal: add --allow-import=<allow_list> for checking dynamic imports/workers #8266)

There were a handful of issues we didn't have time to triage and will discuss them quickly at the start of next week's meeting:

• Make documentation test executable (feat(cli): make documentation tests executable #11782)
• Allow commas in args on the CLI (How to provide an --allow-* arg containing a comma? #6553, Allow --ignore to be used with directories and filenames containing a comma #9535)
• NotCapable error to distinguish between permissions and capabilities (Introduce a "NotCapable" error #7394)
• Flatten Deno.errors into Deno namespace (Flatten the Deno.errors namespace into the Deno namespace #9646)
• Remove Deno.read() and Deno.write()