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Discriminated union types#9163

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ahejlsberg merged 6 commits intomastermicrosoft/TypeScript:masterfrom typeGuardDiscriminantsmicrosoft/TypeScript:typeGuardDiscriminantsCopy head branch name to clipboardJun 17, 2016

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Commits on Jun 10, 2016

• Type guards using discriminant properties of string literal types

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Commits on Jun 13, 2016

• Narrow type in case/default sections in switch on discriminant property

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• No implicit returns following exhaustive switch statements

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Commits on Jun 14, 2016

• Narrow non-union types to ensure consistent results

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• Add tests

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• Merge branch 'master' into typeGuardDiscriminants

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