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generic type parameters without an explicit constraint are now implicitly constrained to unknownhttps://github.com/Microsoft/TypeScript/pull/30637
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#-k-string-unknown--is-no-longer-a-wildcard-assignment-target
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#improved-excess-property-checks-in-union-types
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#background
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#rationale-and-change
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https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#background-1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#change-and-rationale
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#workarounds-1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#libdts-includes-the-omit-helper-type
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#objectkeys-rejects-primitives-in-es5
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#background-2
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#rationale-and-change-1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#workarounds-2
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-34
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#top-level-this-is-now-typed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#propagated-generic-type-arguments
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#contextual-return-types-flow-in-as-contextual-argument-types
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#consistent-inference-priorities-outside-of-strictfunctiontypes
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-32
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#libdts-updates
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https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#more-specific-types
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-31
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#some-vendor-specific-types-are-removed-from-libdts
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#recommendations
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#narrowing-functions-now-intersects--object-and-unconstrained-generic-type-parameters
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-30
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#the-unknown-keyword-is-reserved
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#intersecting-with-nullundefined-reduces-to-nullundefined-outside-of-strictnullchecks
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#recommendation
"identity" elementshttps://en.wikipedia.org/wiki/Identity_element
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-29
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#keyof-now-includes-string-number-and-symbol-keys
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#recommendations-1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#trailing-commas-not-allowed-on-rest-parameters
#22262https://github.com/Microsoft/TypeScript/pull/22262
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#in-strictnullchecks-an-unconstrained-type-parameter-is-no-longer-assignable-to-object
#24013https://github.com/Microsoft/TypeScript/issues/24013
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-28
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#unused-type-parameters-are-checked-under---nounusedparameters
#20568https://github.com/Microsoft/TypeScript/issues/20568
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#some-ms-specific-types-are-removed-from-libdts
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#htmlobjectelement-no-longer-has-an-alt-attribute
#21386https://github.com/Microsoft/TypeScript/issues/21386
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-27
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.7%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#tuples-now-have-a-fixed-length-property
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#under-allowsyntheticdefaultimports-types-for-default-imports-are-synthesized-less-often-for-ts-and-js-files
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#stricter-checking-for-indexed-access-generic-type-constraints
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#in-expressions-are-treated-as-type-guards
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#structurally-equivalent-classes-are-not-reduced-in-conditional-operator
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#customevent-is-now-a-generic-type
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-26
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.6%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#write-only-references-are-unused
compiler optionshttps://www.typescriptlang.org/docs/handbook/compiler-options.html
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#arbitrary-expressions-are-forbidden-in-export-assignments-in-ambient-contexts
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-24
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.4%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#weak-type-detection
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#return-types-as-inference-targets
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#stricter-variance-in-callback-parameters
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#promises
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#nested-callbacks
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#stricter-checking-for-generic-functions
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#type-parameter-inference-from-contextual-types
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-23
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.3%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#empty-generic-parameter-lists-are-flagged-as-error
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-22
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.2%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#changes-to-dom-apis-in-the-standard-library
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-21
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.1%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#generated-constructor-code-substitutes-the-return-value-of-super-calls-as-this
TypeScript 1.8https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#disallow-this-accessing-before-super-call
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work
Object.setPrototypeOfhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf
__proto__https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto
these workarounds will not work on Internet Explorer 10 and priorhttps://msdn.microsoft.com/en-us/library/s4esdbwz(v=vs.94).aspx
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#literal-types-are-inferred-by-default-for-const-variables-and-readonly-properties
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#no-type-narrowing-for-captured-variables-in-functions-and-class-expressions
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#implicit-any-error-raised-for-un-annotated-callback-arguments-with-no-matching-overload-arguments
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#comma-operators-on-side-effect-free-expressions-is-now-flagged-as-an-error
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#changes-to-dom-apis-in-the-standard-library-1
#11113https://github.com/Microsoft/TypeScript/issues/11113
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-20
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.0%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#no-type-narrowing-for-captured-variables-in-functions-and-class-expressions-1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#generic-type-parameters-are-now-narrowed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#getters-with-no-setters-are-automatically-inferred-to-be-readonly-properties
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#function-declarations-not-allowed-in-blocks-in-strict-mode
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#templatestringsarray-is-now-immutable
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-18
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.8%22+label%3A%22Breaking+Change%22+is%3Aclosed
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#modules-are-now-emitted-with-a-use-strict-prologue
MDN Articlehttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#exporting-non-local-names-from-a-module
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#reachability-checks-are-enabled-by-default
reachability checkshttps://github.com/Microsoft/TypeScript/pull/4788
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https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#changes-to-dom-apis-in-the-standard-library-2
#949https://github.com/Microsoft/TypeScript/issues/949
#1558https://github.com/Microsoft/TypeScript/issues/1558
#3583https://github.com/Microsoft/TypeScript/issues/3583
#3583https://github.com/Microsoft/TypeScript/issues/3583
#5932https://github.com/Microsoft/TypeScript/issues/5932
#6106https://github.com/Microsoft/TypeScript/issues/6106
#6418https://github.com/Microsoft/TypeScript/issues/6418
#6500https://github.com/Microsoft/TypeScript/issues/6500
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#disallow-this-accessing-before-super-call
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-17
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.7%22+label%3A%22breaking+change%22
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#changes-in-inferring-the-type-from-this
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#automatic-semicolon-insertion-after-class-member-modifiers
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-16
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.6%22+label%3A%22breaking+change%22
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#strict-object-literal-assignment-checking
--suppressExcessPropertyErrorshttps://github.com/Microsoft/TypeScript/pull/4484
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#commonjs-module-resolution-no-longer-assumes-paths-are-relative
the issue that describes the resolution algorithmhttps://github.com/Microsoft/TypeScript/issues/2338
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#function-and-class-default-export-declarations-can-no-longer-merge-with-entities-intersecting-in-their-meaning
the originating issuehttps://github.com/Microsoft/TypeScript/issues/3095
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#module-bodies-are-parsed-in-strict-mode
the ES6 spechttp://www.ecma-international.org/ecma-262/6.0/#sec-strict-mode-code
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#changes-to-dom-apis-in-the-standard-library-3
issue #4295https://github.com/Microsoft/TypeScript/issues/4295
issue #4220https://github.com/Microsoft/TypeScript/issues/4220
issue #3999https://github.com/Microsoft/TypeScript/issues/3999
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#system-module-output-uses-bulk-exports
new bulk-exporthttps://github.com/ModuleLoader/es6-module-loader/issues/386
v0.17.1https://github.com/ModuleLoader/es6-module-loader/releases/tag/v0.17.1
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#js-content-of-npm-package-is-moved-from-bin-to-lib-folder
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-npm-package-does-not-install-globally-by-default
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#decorators-are-checked-as-call-expressions
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-15
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.5%22+label%3A%22breaking+change%22
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#referencing-arguments-in-arrow-functions-is-not-allowed
ES6 spec drafthttp://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#enum-reference-in-lining-changes
#2183https://github.com/Microsoft/TypeScript/issues/2183
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#contextual-type-flows-through-super-and-parenthesized-expressions
#1425https://github.com/Microsoft/TypeScript/issues/1425
#920https://github.com/Microsoft/TypeScript/issues/920
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#dom-interface-changes
last released version before this change (TypeScript 1.5-alpha)https://github.com/Microsoft/TypeScript/blob/v1.5.0-alpha/bin/lib.d.ts
full changehttps://github.com/Microsoft/TypeScript/pull/2739
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#class-bodies-are-parsed-in-strict-mode
the ES6 spechttp://www.ecma-international.org/ecma-262/6.0/#sec-strict-mode-code
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-14
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.4%22+label%3A%22breaking+change%22
issue #868https://github.com/Microsoft/TypeScript/issues/868
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#multiple-best-common-type-candidates
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#generic-type-inference
microsoft/TypeScript#824 (comment)https://github.com/microsoft/TypeScript/pull/824#discussion_r18665727
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#generic-rest-parameters
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#overload-resolution-with-type-argument-inference
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#strict-mode-parsing-for-class-declarations-and-class-expressions
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#typescript-11
breaking change issueshttps://github.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+1.1%22+label%3A%22breaking+change%22+
https://github.com/beshanoe/TypeScript-wiki/blob/master/Breaking-Changes.md#working-with-null-and-undefined-in-ways-that-are-observably-incorrect-is-now-an-error
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