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Bidirectional comparable relation for primitive types#19926

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ahejlsberg merged 3 commits into
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improvePrimitiveComparable
Nov 11, 2017
Merged

Bidirectional comparable relation for primitive types#19926
ahejlsberg merged 3 commits into
masterfrom
improvePrimitiveComparable

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@ahejlsberg
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This PR makes the comparable relation bidirectional for primitive types. For example, the following previously was an error but is now permitted:

declare const x: { a: 1, b: string };
declare const y: { a: number, b: 'a' };

x === y;  // Now ok, previously was error

@@ -0,0 +1,8 @@
// @strict: true

// Verify that properties can vary idependently in comparable relationship
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typo:independently

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@weswigham weswigham left a comment

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Given how similar the logic in two replaced callsites for isSimpleTypeRelatedTo is, it'd be nice to see the logic moved into a helper function; but it's not required, since it's only duplicating code in two places. 🤷‍♂️

@ahejlsberg ahejlsberg merged commit b8fbf88 into master Nov 11, 2017
@ahejlsberg ahejlsberg deleted the improvePrimitiveComparable branch November 11, 2017 17:15
@microsoft microsoft locked and limited conversation to collaborators Jun 14, 2018
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4 participants