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Title: Conditional types by ahejlsberg · Pull Request #21316 · microsoft/TypeScript · GitHub

Open Graph Title: Conditional types by ahejlsberg · Pull Request #21316 · microsoft/TypeScript

X Title: Conditional types by ahejlsberg · Pull Request #21316 · microsoft/TypeScript

Description: TypeScript is a superset of JavaScript that compiles to clean JavaScript output. - Conditional types by ahejlsberg · Pull Request #21316 · microsoft/TypeScript

Open Graph Description: This PR introduces conditional types which add the ability to express non-uniform type mappings. A conditional type selects one of two possible types based on a condition expressed as a type relati...

X Description: This PR introduces conditional types which add the ability to express non-uniform type mappings. A conditional type selects one of two possible types based on a condition expressed as a type relati...

Opengraph URL: https://github.com/microsoft/TypeScript/pull/21316

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Commits44 (44)https://github.com/microsoft/TypeScript/pull/21316/commits
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Conditional typeshttps://github.com/microsoft/TypeScript/pull/21316#top
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masterhttps://github.com/microsoft/TypeScript/tree/master
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Jan 20, 2018https://github.com/microsoft/TypeScript/pull/21316#issue-290210315
Please reload this pagehttps://github.com/microsoft/TypeScript/pull/21316
#21496https://github.com/microsoft/TypeScript/pull/21496
#12215https://github.com/microsoft/TypeScript/issues/12215
#12424https://github.com/microsoft/TypeScript/issues/12424
Please reload this pagehttps://github.com/microsoft/TypeScript/pull/21316
ahejlsberghttps://github.com/ahejlsberg
December 5, 2017 14:18https://github.com/microsoft/TypeScript/pull/21316#commits-pushed-57ca768
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Initial implementation of conditional type operatorhttps://github.com/microsoft/TypeScript/pull/21316/commits/57ca7680c9f5ec0d772c9dd94294cbcff2a29129
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Add type relationships and distribute over union typeshttps://github.com/microsoft/TypeScript/pull/21316/commits/063eed1a47b873a60e804d748dbe2959f9b51d70
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Clean up isGenericXXXType functionshttps://github.com/microsoft/TypeScript/pull/21316/commits/43e195d966f65b019f15e2cbc7c16a6e2e47b8d9
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Introduce TypeFlags.Instatiablehttps://github.com/microsoft/TypeScript/pull/21316/commits/61225cc57c1ae9c2aea8ecbd15d24b55e9f3d02f
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Rename TypeVariable to InstantiableTypehttps://github.com/microsoft/TypeScript/pull/21316/commits/9f74a7a22887a0e5f85171640b01f66df193b37f
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Inference for conditional and extends type operatorshttps://github.com/microsoft/TypeScript/pull/21316/commits/20434fabe66cca85208dd7f5be3890a3db29d0c6
20434fahttps://github.com/microsoft/TypeScript/pull/21316/commits/20434fabe66cca85208dd7f5be3890a3db29d0c6
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Fix typohttps://github.com/microsoft/TypeScript/pull/21316/commits/ddc631c5d47150d5227470d64853a059d839e011
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Handle constraints for distributive conditional typeshttps://github.com/microsoft/TypeScript/pull/21316/commits/27b945b898d0ec2bf9914981b38047e8206993ec
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Accept new baselineshttps://github.com/microsoft/TypeScript/pull/21316/commits/f59e2e63316fc826142d88d52f007625ed646c04
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Move JsxAttributes and MarkerType from TypeFlags to ObjectFlagshttps://github.com/microsoft/TypeScript/pull/21316/commits/14590f1884c43966c62eb2016845631e7149df5b
14590f1https://github.com/microsoft/TypeScript/pull/21316/commits/14590f1884c43966c62eb2016845631e7149df5b
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Accept new baselineshttps://github.com/microsoft/TypeScript/pull/21316/commits/100e4f6f3b5e4a06081753d01aaedd303e145a34
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Parse xxx? as JSDoc type when not followed by token that starts typehttps://github.com/microsoft/TypeScript/pull/21316/commits/c5fd2f14f38d669f604f8cb40af8f3e0d747c600
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Accept new baselineshttps://github.com/microsoft/TypeScript/pull/21316/commits/341c3973a33bbf6c6dadc5aa4ae77a6c53813834
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Fix linting errorhttps://github.com/microsoft/TypeScript/pull/21316/commits/3f4911f44adad5ca4410c2da90a4b8f51a285073
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Merge branch 'master' into conditionalTypeshttps://github.com/microsoft/TypeScript/pull/21316/commits/abc8110e9b97c9c19ca740e46c82f27b837069ad
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Propagate both TypeFlags and ObjectFlags in getSpreadTypehttps://github.com/microsoft/TypeScript/pull/21316/commits/bb23bb2a9248afb8eb357fffe312e8f9313f6649
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Eagerly evaluate S extends T when S is definitely or definitely not a…https://github.com/microsoft/TypeScript/pull/21316/commits/c10a5520e2bd47efdc01ad8ca0fcedcf8a49aaa3
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Revert to extends check being part of conditional typehttps://github.com/microsoft/TypeScript/pull/21316/commits/53b1572ed60283c765fabf32830608f44b1f4458
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Remove 'T extends U' type constructorhttps://github.com/microsoft/TypeScript/pull/21316/commits/5094f7677cedbfde6548627f8d30b2e673d2584c
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Accept new baselineshttps://github.com/microsoft/TypeScript/pull/21316/commits/15baf0ead598d302f7dd501c1bbd94c0edbb1f70
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Properly handle 'any' and 'never' as conditional check typehttps://github.com/microsoft/TypeScript/pull/21316/commits/9598acd47702e2e8dee9a43d696d88b2730a2c6b
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Erase substitution types in type references and type alias instantiat…https://github.com/microsoft/TypeScript/pull/21316/commits/e96ec8c2c7bb6ea85610c9462bf6b07ed8b4c7cc
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Optimize the sameMap functionhttps://github.com/microsoft/TypeScript/pull/21316/commits/d52fa71f62dec04e3cdd3b5e4b9016adaf2ddae2
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Merge branch 'master' into conditionalTypeshttps://github.com/microsoft/TypeScript/pull/21316/commits/4ec6fdd96fa9a9835e6b9819d8ba0f6feeb8397e
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Separate code path for conditional type instantiationhttps://github.com/microsoft/TypeScript/pull/21316/commits/fd0dd6ed4c27fe5dd83fe78b2b3fb0edbe689606
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Fix parsinghttps://github.com/microsoft/TypeScript/pull/21316/commits/c360c24b9b6e054f3bb4dd5cced7b1d161fd5d1a
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Mar 18, 2018 https://github.com/microsoft/TypeScript/pull/21316#ref-issue-297280681
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Mar 19, 2018 https://github.com/microsoft/TypeScript/pull/21316#ref-issue-305832563
Nested conditional generic types yields boolean not assignable to true | false | undefined. #22630 https://github.com/microsoft/TypeScript/issues/22630
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