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Title: Support ES6 built-in symbols by JsonFreeman · Pull Request #1978 · microsoft/TypeScript · GitHub

Open Graph Title: Support ES6 built-in symbols by JsonFreeman · Pull Request #1978 · microsoft/TypeScript

X Title: Support ES6 built-in symbols by JsonFreeman · Pull Request #1978 · microsoft/TypeScript

Description: This change adds type checking support for properties whose names are the built-in ES symbols. It allows you to create objects like: var obj = { [Symbol.toStringTag]() { return ""; } } And you get the right type when you index: obj[Symbol.toStringTag](0); // Error because the method expected no arguments I've also added a new keyword for the symbol primitive type, as well as type guard support, errors for all the operators ,etc. To see the full design discussion, see #980. This pull request fixes #1750, and #1863. However, strong type information is only available for the built-in ES6 symbols (properties of the global Symbol object). This does not cover symbol indexers, which allows an object to act as a map with arbitrary symbol keys. I also did my best to allow symbol polyfilling to work on the type side, provided that the provider of the polyfill also provide the typings for the global Symbol object. I recommend going through the pull request commit-by-commit, although some commits were experiments that were largely reverted later on. This is mainly true for the following two commits, so feel free to skip them if you like: Allow Symbol indexer in ES6 Create global Symbol type

Open Graph Description: This change adds type checking support for properties whose names are the built-in ES symbols. It allows you to create objects like: var obj = { [Symbol.toStringTag]() { return "&q...

X Description: This change adds type checking support for properties whose names are the built-in ES symbols. It allows you to create objects like: var obj = { [Symbol.toStringTag]() { return &quo...

Opengraph URL: https://github.com/microsoft/TypeScript/pull/1978

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Show all changes 44 commits https://github.com/microsoft/TypeScript/pull/1978/files
11d75ef Allow Symbol indexer in ES6 JsonFreeman Jan 26, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/11d75ef4ce1d341c9cc26eb96e8dca41ba70843d
b30d8f3 Change computed property error messages to be about symbols JsonFreeman Jan 28, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/b30d8f39c23b08063c12e9b11a6e5577cc0b537a
39952b1 Syntactically allow computed properties everywhere if the name looks … JsonFreeman Jan 28, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/39952b1a934b34666219b7e81aee2cf15abc9dad
d788624 Move hasDynamicName to utilities.ts JsonFreeman Jan 28, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/d78862433211e6ae693df6728adbf37c57562ee6
07f3641 Update hasDynamicName to take well known symbols into account JsonFreeman Jan 28, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/07f3641af2b3def43c823ff8287fb065628a09b6
f344654 Add named property symbol for known Symbol properties JsonFreeman Jan 28, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/f344654460c0772eb781754a0c5b460cf740e114
30892af Change computed property error message to mention Symbols JsonFreeman Jan 29, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/30892af5636b462d2ead50ad334e6db653b51df9
9cb38fb Create global Symbol type JsonFreeman Jan 30, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/9cb38fb5f2cf88fc39773f59454a3664ffbbccfc
25fcbe2 Change certain hasDynamicName checks to check the SyntaxKind instead JsonFreeman Jan 30, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/25fcbe2f9ec163da94fef1cfd2251d27c74333e0
b60fa14 Add tests for operators with symbol operand JsonFreeman Jan 30, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/b60fa1467f94da0566d94bebec061a5cd28f35b9
779661c Add tests for symbol properties JsonFreeman Feb 2, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/779661c8dafd36e2cbd70dc4d7ac645369c4f1e0
95af997 Accept correct baselines for symbol property tests JsonFreeman Feb 3, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/95af9978e19551b6ce94eac64dfcbd1acb9203bf
e508bf7 Add symbol keyword JsonFreeman Feb 3, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/e508bf7e86939819a11a3591ba2bf204e6ac19e1
ebdd96b Update tests to use new symbol keyword JsonFreeman Feb 3, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/ebdd96bacf7f4b5d34cee0a8c9a262e4100a153e
e346b70 Change isTypeOfKind calls to pass symbol TypeFlag when needed JsonFreeman Feb 4, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/e346b7001303723e904888645cdb1e655d9ea879
59a704e Rename references in es6.d.ts from Symbol to symbol JsonFreeman Feb 4, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/59a704e7c1f8a40c705bf96220eefbafd4718668
d793658 Change Symbol to symbol in error messages JsonFreeman Feb 4, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/d793658b7ff228f023207748cbae908aca05b0c4
2d16474 Fix expression checking for symbols JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/2d1647485cfb33a7ae1d84a6bc08ced6f952a552
6a6c03b Fix error message wording JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/6a6c03b9b79bbd158eab7acc01a740de6b1b5df2
92617f5 Don't pass prop.name directly for error reporting JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/92617f5978a9ef2da4b39f578e6b1d376108b593
fbeadbc Add test for new Symbol() JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/fbeadbcbd3dfa42f970f66386375e0f21549c670
9f39a53 Make Symbol the apparent type of symbol JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/9f39a5388ab6cd4a3393938fef16fb7219182b20
df826de symbols in type guards JsonFreeman Feb 5, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/df826de042f6e18102e44d625bfcba6df111e60a
d07ed67 Support indexing with known symbols JsonFreeman Feb 6, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/d07ed679a01a75b1fd7735da366be3cf5eee796f
8325862 Fix error message JsonFreeman Feb 6, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/83258629ea361820078caf7726d69cd09a89e3e0
3834edd Refactor part of getPropertyNameForIndexedAccess into checkSymbolName… JsonFreeman Feb 6, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/3834edd747fc9ffab50299e5286183eb8e900feb
4c09ccd Check that Symbol properties are proper, and support downlevel type c… JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/4c09ccd60ecd8a6a7ffd04ea413b8dbe8e8468f3
3560442 Declaration emit for symbol properties JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/35604426c885f3884ddee31bc198557bc93e4413
2f3c32a Navigation bar support for symbols JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/2f3c32afd659b3edda1b24599f1abc1b1b125d18
eb50619 Disable symbol indexer JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/eb5061971df26526a25633f2ba40677406489cf2
52cb13e Uncomment symbol properties in es6.d.ts JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/52cb13e9d6265417a960b43e32ffce6a53b48d2a
75382c1 Accept baselines after rebase JsonFreeman Feb 7, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/75382c14f9aabc4f1e120d21df757a1d4e70cc25
18276e5 Address feedback from @yuit JsonFreeman Feb 11, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/18276e526754b14d1f0f30ef794f19a64d193767
a94e61b Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 11, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/a94e61bfcdcf9ca3fd83f27b3e46151df8d8f7db
486cebd Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 12, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/486cebd224b4c4fa3c73c175b4d142c301811943
4942c5f Address feedback JsonFreeman Feb 13, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/4942c5f615cb675b3ced89c2c29c4f5eeff4b819
9c273d8 Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 13, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/9c273d8133c12a64bd78f5270a7fb25f75fc0a53
65d831e Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 16, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/65d831e8b33b1ee9c0583bd0f4ce483ef63690c5
ac829a8 Error for naming an interface 'symbol' JsonFreeman Feb 16, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/ac829a838457762fe00f6e116c543a0c81f496c5
7d7d54f Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 16, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/7d7d54f6f0f6bede6fff185b27b19c855d348a07
935c602 Rebaseline after merge JsonFreeman Feb 16, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/935c6024c27593388a00bc1975f21e5e291b41a9
59dc7d3 Address feedback JsonFreeman Feb 17, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/59dc7d3a5bf606e7e2b00786fbc57ea6f6f02319
dd6a129 Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 17, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/dd6a12911cc8d01711987601ee0e84b1d641d080
47404bc Merge branch 'master' of https://github.com/Microsoft/TypeScript into… JsonFreeman Feb 18, 2015 https://github.com/microsoft/TypeScript/pull/1978/commits/47404bccf08092d0cb087cb85e9c202bc7b79c89
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