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[TypeScript] Drop support for TS 3.1 #1805

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[TypeScript] Drop support for TS 3.1 #1805

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[TypeScript] Drop support for TS 3.1
deyaaeldeen Sep 15, 2020
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adding the list back and adding a note about downlevel-dts
deyaaeldeen Sep 16, 2020
76faccd
update link
deyaaeldeen Sep 16, 2020
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6 changes: 3 additions & 3 deletions docs/typescript/design.md
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Expand Up @@ -23,12 +23,12 @@ Use [caniuse.com](https://caniuse.com) to determine whether you can use a given

{% include requirement/SHOULDNOT id="ts-no-ie11-support" %} support IE11. If you have a business justification for IE11 support, contact the [Architecture Board].

{% include requirement/MUST id="ts-support-ts" %} compile without errors on all versions of TypeScript greater than 3.1.
{% include requirement/MUST id="ts-support-ts" %} compile without errors on TypeScript v3.5 and greater.

While consumers are fast at adopting new versions of TypeScript, version 3.1 is used by Angular 7, which is still commonly used. Supporting older versions of TypeScript can be a challenge. There are two general approaches:
Supporting older versions of TypeScript can be a challenge. There are two general approaches:

1. Don't use new features.
2. Use [`typesVersions`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-1.html#version-selection-with-typesversions), which might require manual effort to produce typings compatible with older versions based on the new typings.
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2. Use [`typesVersions`](https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#version-selection-with-typesversions), which might require manual effort to produce typings compatible with older versions based on the new typings. Much of that effort can be automated using [`downlevel-dts`](https://github.com/sandersn/downlevel-dts).

{% include requirement/MUST id="ts-register-dropped-platforms" %} get approval from the [Architecture Board] to drop support for any platform (except IE11 and Node 6) even if support isn't required.

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