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Fix typings for RealtimeChannel.modes #1955

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@lawrence-forooghian lawrence-forooghian commented Jan 21, 2025

For some reason, this property returns lowercased values. So, reflect this in the typings. This is the only non-breaking change we can make, since:

  • if we change the return value of RealtimeChannel.modes to be uppercase, that will break things for users who are checking this return value against a list of lowercase values (having previously observed that this property returns lowercase values even though it contradicts the typings)

  • if we change the ChannelModes type to be lowercase, then we break things for TypeScript users who are setting modes in their channel options

I have also changed the ChannelModes type to indicate that it accepts lowercased values; this allows a user to pass a ResolvedChannelModes when setting modes in their channel options.

In our next major release, we should remove this duplicate type and only allow a single case (probably lowercase, since that's what we use for all of the other enum values in this SDK). Have created #1954 for this.

Resolves #1952.

Summary by CodeRabbit

  • New Features

    • Enhanced channel mode definitions to support both uppercase and lowercase representations.
    • Introduced a new ResolvedChannelMode type for more flexible channel mode handling.
  • Improvements

    • Updated type signatures to allow more versatile channel mode configurations.
    • Added lowercase variants of existing channel mode types.

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coderabbitai bot commented Jan 21, 2025

Walkthrough

The changes modify the TypeScript type definitions for channel modes in the ably.d.ts file. The primary modification introduces case-insensitive support for channel modes by expanding existing type definitions to accept both uppercase and lowercase variants. A new ResolvedChannelModes namespace is created to handle lowercase mode representations, and the ChannelMode type is updated to reference these new resolved mode types.

Changes

File Change Summary
ably.d.ts - Updated ChannelModes types to accept both uppercase and lowercase values
- Added new ResolvedChannelModes namespace with lowercase mode types
- Introduced ResolvedChannelMode export type
- Modified RealtimeChannel interface to use ResolvedChannelMode[]

Assessment against linked issues

Objective Addressed Explanation
Resolve case inconsistency between typings and runtime behavior

Poem

🐰 A Rabbit's Type Tale 🐰

In the realm of types, both big and small,
Uppercase and lowercase now stand tall
Channel modes dance with newfound grace
Flexibility wins this coding race!
TypeScript magic, oh so neat! 🎩✨


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👍 with one comment

@@ -853,19 +853,19 @@ declare namespace ChannelModes {
/**
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Maybe worth leave a link to this pr or #1954 in the docstring comment for ChannelModes to explain the redundant values

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Done 👍

For some reason, this property returns lowercased values. So, reflect
this in the typings. This is the only non-breaking change we can make,
since:

- if we change the return value of RealtimeChannel.modes to be
  uppercase, that will break things for users who are checking this
  return value against a list of lowercase values (having previously
  observed that this property returns lowercase values even though it
  contradicts the typings)

- if we change the ChannelModes type to be lowercase, then we break
  things for TypeScript users who are setting `modes` in their channel
  options

I have also changed the ChannelModes type to indicate that it accepts
lowercased values; this allows a user to pass a ResolvedChannelModes
when setting `modes` in their channel options.

In our next major release, we should remove this duplicate type and only
allow a single case (probably lowercase, since that's what we use for
all of the other enum values in this SDK). Have created #1954 for this.

Resolves #1952.
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case inconsistency between typings and runtime behaviour for ChannelModes
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