Fix babel build error, convert Poll class into a function

[JSReds]

Change-type: patch
Signed-off-by: Andrea Rosci andrear@balena.io

This PR should resolve a babel build error:

ERROR in ./src/utils/poll.ts 42:16
Module parse failed: The keyword 'private' is reserved (42:16)
File was processed with these loaders:
 * ./node_modules/babel-loader/lib/index.js
You may need an additional loader to handle the result of these loaders.
| var DEFAULT_GRACE_RATIO = 0.33;
| export var Poll = /*#__PURE__*/function () {
>   function Poll(private fn, private interval, graceRatio, isTabActive) {
|     _classCallCheck(this, Poll);
|
 @ ./src/index.ts 58:0-48 58:0-48 58:0-48
 @ ./.storybook/preview.js
 @ ./.storybook/preview.js-generated-config-entry.js
 @ multi ./node_modules/@storybook/core-client/dist/esm/globals/polyfills.js ./node_modules/@storybook/core-client/dist/esm/globals/globals.js ./.storybook/storybook-init-framework-entry.js ./node_modules/@storybook/addon-essentials/node_modules/@storybook/addon-docs/dist/esm/frameworks/common/config.js-generated-other-entry.js ./node_modules/@storybook/addon-essentials/node_modules/@storybook/addon-docs/dist/esm/frameworks/react/config.js-generated-other-entry.js ./node_modules/@storybook/addon-links/dist/esm/preset/addDecorator.js-generated-other-entry.js ./node_modules/@storybook/addon-actions/dist/esm/preset/addDecorator.js-generated-other-entry.js ./node_modules/@storybook/addon-actions/dist/esm/preset/addArgs.js-generated-other-entry.js ./node_modules/@storybook/addon-backgrounds/dist/esm/preset/addDecorator.js-generated-other-entry.js ./node_modules/@storybook/addon-backgrounds/dist/esm/preset/addParameter.js-generated-other-entry.js ./node_modules/@storybook/addon-measure/dist/esm/preset/preview.js-generated-other-entry.js ./node_modules/storybook-addon-outline/dist/esm/preset/addDecorator.js-generated-other-entry.js ./.storybook/preview.js-generated-config-entry.js ./.storybook/generated-stories-entry.js (webpack)-hot-middleware/client.js?reload=true&quiet=false&noInfo=undefined

Contributor checklist

• I have regenerated jest snapshots for any affected components with npm run generate-snapshots

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---

[thgreasi]

I think we do use this in the UI to check whether the poll is cancelled.
Or maybe we only do that for useRequest 🤔 ?

[JSReds]

need discussion, the fix was released with #1595