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List of keywords you searched for before creating this issue. Write them down here so that others can find this suggestion more easily and help provide feedback.
class implements interface completions
✅ Viability Checklist
My suggestion meets these guidelines:
This wouldn't be a breaking change in existing TypeScript/JavaScript code
This wouldn't change the runtime behavior of existing JavaScript code
This could be implemented without emitting different JS based on the types of the expressions
This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
interfaceType{isA?: false;isB?: false;}typePickType<TextendskeyofType>={[KinkeyofType]?: KextendsT ? true : false|undefined;};classAimplementsPickType<'isA'>{isA: true=true;a=1;}classBimplementsPickType<'isB'>{isB: true=true;b=1;}typeAorB=A|B;leta: AorB|undefined;if(a){if(a.isA)a.a;// error Property 'isA' does not exist on type 'B'if(a.isB)a.b;// error Property 'isB' does not exist on type 'A'}
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Suggestion
🔍 Search Terms
List of keywords you searched for before creating this issue. Write them down here so that others can find this suggestion more easily and help provide feedback.
class implements interface completions
✅ Viability Checklist
My suggestion meets these guidelines:
⭐ Suggestion
📃 Motivating Example
💻 Use Cases
use case
typescriptlang live link
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