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@deprecated for properties of merged Interfaces #40365

@htho

Description

@htho

TypeScript Version: 4.1.0-dev.20200903

Search Terms: deprecated, interface, merge

Code

interface O {
	old: "old";
	new: "new";
}
interface O {
	/** @deprecated */
	old: "old";
}

const o: O = {} as any;

const a = o.old;

Expected behavior:
o.old should be marked as deprecated

Actual behavior:
o.old is not marked as deprecated

Playground Link: https://www.typescriptlang.org/play?ts=4.1.0-dev.20200903&ssl=6&ssc=20&pln=6&pc=2#code/JYOwLgpgTgZghgYwgAgPLIN4CgCQB7AGwBMAuZAIkKPIG5cQIB3M8hx2rAXy1ElkRTpsOAPQAqMcgACRCAAcoEBHEhFkYkbiosqHblgR4QAZzDI8ZdAF5MnZHGP2QATzoGjp+8ht4AdFRogA

Related Issues: none as far as I know.

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