Support for static class properties without babel plugin

🚀 Feature Proposal

A babel plugin shouldn’t be required to use static class properties (a native Node LTS feature now).

Motivation

Node LTS is v12.x now which supports static class properties. Developers ideally shouldn’t need to include a babel plugin for a natively supported feature 🙏

UPDATE: I was able to work around this without a babel plugin by specifying transform: {} in jest.config.js. This is still not ideal, however. I would expect jest to work out of the box for natively-supported code.

Example

This error wouldn’t happen when I run my tests.

    SyntaxError: /Users/david/repos/mission-control-api/classes/BaseModel.class.js: Support for the experimental syntax 'classProperties' isn't currently enabled (26:3):

      24 |       ...super.schema,
      25 |   */
    > 26 |   static schema = {
         |   ^
      27 |     createdAt: { type: Date, required: true },
      28 |     id: { type: CosmosId },
      29 |     updatedAt: { type: Date, required: true },

    Add @babel/plugin-proposal-class-properties (https://git.io/vb4SL) to the 'plugins' section of your Babel config to enable transformation.

      at Parser.raise (node_modules/@babel/parser/lib/index.js:6930:17)
      at Parser.expectPlugin (node_modules/@babel/parser/lib/index.js:8328:18)
      at Parser.parseClassProperty (node_modules/@babel/parser/lib/index.js:11617:12)
      at Parser.pushClassProperty (node_modules/@babel/parser/lib/index.js:11582:30)
      at Parser.parseClassMemberWithIsStatic (node_modules/@babel/parser/lib/index.js:11556:14)
      at Parser.parseClassMember (node_modules/@babel/parser/lib/index.js:11453:10)
      at node_modules/@babel/parser/lib/index.js:11408:14
      at Parser.withTopicForbiddingContext (node_modules/@babel/parser/lib/index.js:10486:14)
      at Parser.parseClassBody (node_modules/@babel/parser/lib/index.js:11385:10)
      at Parser.parseClass (node_modules/@babel/parser/lib/index.js:11359:22)

Pitch

Why does this feature belong in the Jest core platform?

I believe it would be best if jest can run on valid, native NodeJS code with no other dependencies or additional configuration 😃

[jeysal]

This is Babel’s decision but I would expect that it will be enabled by default once it is stage 4.

[github-actions[bot]]

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