feat(types): drop TypeScript < 4.1 (sequelize#13954)

Co-authored-by: Rik Smale <13023439+WikiRik@users.noreply.github.com>
creditiq · Jun 2, 2022 · 099c7e0 · 099c7e0
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diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ts-version: ["3.9", "4.0", "4.1", "4.2", "4.3", "4.4", "4.5"]
+        ts-version: ["4.1", "4.2", "4.3", "4.4", "4.5"]
     name: TS Typings (${{ matrix.ts-version }})
     runs-on: ubuntu-latest
     steps:

diff --git a/docs/manual/other-topics/typescript.md b/docs/manual/other-topics/typescript.md
@@ -1,6 +1,9 @@
 # TypeScript
 
-Since v5, Sequelize provides its own TypeScript definitions. Please note that only TS >= 3.1 is supported.
+Sequelize provides its own TypeScript definitions.
+
+Please note that only **TypeScript >= 4.1** is supported.
+Our TypeScript support does not follow SemVer. We will support TypeScript releases for at least one year, after which they may be dropped in a SemVer MINOR release.
 
 As Sequelize heavily relies on runtime property assignments, TypeScript won't be very useful out of the box. A decent amount of manual type declarations are needed to make models workable.