Class private methods are not enabled.

I just upgraded tracked-built-ins in an addon and am getting this error:

Build Error (broccoli-persistent-filter:Babel > [Babel: tracked-built-ins]) in tracked-built-ins/-private/object.js

ember-statechart-component/tracked-built-ins/-private/object.js: Class private methods are not enabled.
  65 |
  66 |   // @private
> 67 |   #readStorageFor(key) {
     |   ^
  68 |     let storage = this.#storages.get(key);
  69 |
  70 |     if (storage === undefined) {

but, what’s weird, is that I’ve worked on tracked-built-ins with private methods… and this wasn’t an issue at all.

My ember-cli-babel appears up to date:

❯ npm ls ember-cli-babel
├─┬ @ember/test-helpers@2.6.0
│ ├─┬ @ember/test-waiters@3.0.0
│ │ └── ember-cli-babel@7.26.6 deduped
│ ├── ember-cli-babel@7.26.6 deduped
│ └─┬ ember-destroyable-polyfill@2.0.3
│   └── ember-cli-babel@7.26.6 deduped
├─┬ @glimmer/component@1.0.4
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-auto-import@1.12.0
│ ├─┬ @embroider/core@0.33.0
│ │ └─┬ @embroider/macros@0.33.0
│ │   └── ember-cli-babel@7.26.6 deduped
│ └── ember-cli-babel@7.26.6 deduped
├── ember-cli-babel@7.26.6
├─┬ ember-cli-typescript-blueprints@3.0.0
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-could-get-used-to-this@1.0.1
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-load-initializers@2.1.2
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-maybe-import-regenerator@0.1.6
│ └── ember-cli-babel@6.18.0
├─┬ ember-page-title@6.2.2
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-qunit@5.1.5
│ ├── ember-cli-babel@7.26.6 deduped
│ └─┬ ember-cli-test-loader@3.0.0
│   └── ember-cli-babel@7.26.6 deduped
├─┬ ember-resolver@8.0.3
│ └── ember-cli-babel@7.26.6 deduped
├─┬ ember-source@3.26.2
│ └── ember-cli-babel@7.26.6 deduped
├─┬ qunit-dom@1.6.0
│ └── ember-cli-babel@7.26.6 deduped
├─┬ tracked-built-ins@2.0.0
│ ├── ember-cli-babel@7.26.6 deduped
│ └─┬ ember-tracked-storage-polyfill@1.0.0
│   └── ember-cli-babel@7.26.6 deduped
└─┬ tracked-maps-and-sets@3.0.2
  └── ember-cli-babel@7.26.6 deduped


ember-statechart-component on  upgrade-debs [$!] 

  origin  [e-mail]:NullVoxPopuli/ember-statechart-component.git 

❯ latestPkgVer ember-cli-babel
Current:
"7.26.6"

Tags:
{
  "latest": "7.26.6",
  "alpha": "7.0.0-alpha.2",
  "beta": "7.24.0-beta.2",
  "5.x": "5.2.8",
  "old": "6.17.2"
}

Most Recent:
"7.26.6"

and browserslist seems to be up to date as well.

❯ npx browserslist --update-db
Latest version:     1.0.30001279
Installed version:  1.0.30001279
caniuse-lite is up to date
caniuse-lite has been successfully updated

No target browser changes

[chriskrycho]

rwjblue and I are going to try to get this knocked out tomorrow; in the meantime, folks may be able to work around it by pinning caniuse-lite to 1.0.30001280. (We did that for an internal addon and it did the trick.)

[chriskrycho]

All right, cool. I’ll chat with @rwjblue and see if we can land the fix in ember-cli-babel now that Data is unblocked, and that should then cascade out to the rest of the ecosystem “automagically” by way of Renovate/Dependabot/etc.