Bump typescript from 2.8.3 to 2.8.4

[dependabot-preview[bot]]

Bumps typescript from 2.8.3 to 2.8.4.

Release notes

*Sourced from [typescript's releases](https://github.com/Microsoft/TypeScript/releases).* > ## TypeScript 2.8.4 > This release include a set of bug fixes reported against [TypeScript 2.8.3](https://github.com/Microsoft/TypeScript/releases/tag/v2.8.3). For the complete list of fixed issues, check out the [fixed issues query for TypeScript 2.8.4](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues?q=is%3Aissue+milestone%3A%22TypeScript+2.8.4%22+label%3A%22fixed%22+). > > Download: > - [npm](https://www.npmjs.com/package/typescript) > - [Visual Studio 2015 plugin](https://www.microsoft.com/en-us/download/details.aspx?id=48593) > - [Visual Studio 2017](https://www.microsoft.com/en-us/download/details.aspx?id=55258) (Select new version in [Tools/Options](https://github.com/Microsoft/TypeScript/wiki/Updating-TypeScript-in-Visual-Studio-2017)) > - [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild/2.8.4)

Commits

- [`c59ea30`](https://github.com/Microsoft/TypeScript/commit/c59ea304bc49d93385c22be7b8d2b401891ebc04) Update LKG - [`acd7f81`](https://github.com/Microsoft/TypeScript/commit/acd7f81d0e40c1746681fed415f52c962de7c025) Accept new baselines - [`2d7efb3`](https://github.com/Microsoft/TypeScript/commit/2d7efb35b16902766947637be5b54981368a97cd) Add test of stack overflow - [`c798e21`](https://github.com/Microsoft/TypeScript/commit/c798e2109c27d3a4b0c60e37c0a23909d33c36f1) Compare merged targetInitializer to target - [`68875dc`](https://github.com/Microsoft/TypeScript/commit/68875dc5c87399b36bf27f3fe038f19d58dbcc0c) JS initializers use original valueDecl, not mutated - [`6b21c37`](https://github.com/Microsoft/TypeScript/commit/6b21c379373f9edf4b91074cdc57b1446c347228) Merge pull request [#24053](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues/24053) from Microsoft/dev/billti/update-to-2.8.4 - [`22715da`](https://github.com/Microsoft/TypeScript/commit/22715daa2b41534a7c2b606663f53f229a5b7621) Update LKG - [`850cfc5`](https://github.com/Microsoft/TypeScript/commit/850cfc59ba82e4e6f09621e049eb7a4e326a9f7a) Bump version to 2.8.4 - [`92b18d8`](https://github.com/Microsoft/TypeScript/commit/92b18d8c7595b541cd15f0bc59e52a507231ddb9) Merge pull request [#24052](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues/24052) from RyanCavanaugh/portInitializerFix - [`e03e2ae`](https://github.com/Microsoft/TypeScript/commit/e03e2aef5fcfa7c8bb2d3ebb43dedd33f341a213) Port fix [#24050](https://github-redirect.dependabot.com/Microsoft/TypeScript/issues/24050) from master to release-2.8 - See full diff in [compare view](https://github.com/Microsoft/TypeScript/compare/v2.8.3...v2.8.4)

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[dependabot-preview[bot]]

Superseded by #33.