TypeScript conversion of Index Lifecycle Management plugin

[yuliacech]

Summary

This issue is to plan and discuss work converting JavaScript files in ILM plugin codebase to TypeScript.

Plugin components

ILM plugin consists of 3 major components: EditPolicy page, PolicyTable and IndexManagementExtension.

EditPolicy

This component allows creating/editing of an ILM policy and consists of 4 phases (hot, warm, cold, delete). The conversion to TS can be combined with switching from Redux-store to useRequest hooks and (de)serialization services. Following steps are needed to complete the conversion/refactoring:

• Create types for policies and other objects returned from ES API
• Convert store actions to fetch policy/policies and to save a policy to useRequest hook
• Convert store selectors to validate inputs while editing a policy to a service
• Convert store reducers to transform to and from ES API to a (de)serialization service
• Convert phases components to receive props with phase data, validation errors and a callback to update phase data
• Convert EditPolicy from a Redux connected component to useRequest hook

PR: #75148

PolicyTable

This component uses Redux store to fetch a list of policies and pagination/filtering/sorting of the table. Steps:

• Convert store actions to fetch policies to useRequest hook
• Convert store reducers for table pagination etc to a service
• Convert DeletePolicy and AddPolicyToTemplate modals to TS (without UX changes/refactorings)
• Convert PolicyTable from a Redux connected component to useRequest hook

PR: #76006

IndexManagementExtension

This part consists of several functions that add functionality to IndexManagement. Steps:

• Convert AddLifecyclePolicy and IndexLifecycleSummary modals to TS
• Convert IndexManagementExtension

PR: #76517

Clean up

• Convert any remaining js files, such as jest tests, services and helpers
• Add correct typings any remaining any types

PR: #76308

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[yuliacech]

Closing this issue since its last PR has been merged.