feat: TypeScript 5.7 (#1470)

jsii 5.7.x with support for TypeScript 5.7

https://devblogs.microsoft.com/typescript/announcing-typescript-5-7/

---

By submitting this pull request, I confirm that my contribution is made
under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

.projenrc.ts

@@ -11,20 +11,18 @@ import { UpgradeDependencies } from './projenrc/upgrade-dependencies';
 //  1. Fork the current `main` to a maintenance branch:
 //     `git switch main && git fetch --all && git pull`
 //     `git push origin main:maintenance/vX.Y` (X.Y is the TS version that is about to be replaced by a new release)
-//  2. Add a branch protection rule for the new maintenance branch.
-//     Copy the settings from the most recent maintenance branch.
-//  3. Edit `projenrc/support.ts`, set maintenance EOL date for the new maintenance version to be 6 months from
+//  2. Edit `projenrc/support.ts`, set maintenance EOL date for the new maintenance version to be 6 months from
 //     today (round up to the mid-point or end of month), make the new version current.
-//  4. Update `minNodeVersion` to the oldest LTS version of Node (i.e. dropping support for EOL versions of Node)
-//  5. Update the version list in the README (remember to remove EOS versions)
-//  6. If any versions dropped into EOS, change the respective branch protection rule to include "Lock branch"
-//  7. `npx projen`
-//  8. `npx projen build` and resolve any new test failures that might be introduced by the new TS version
-//  9. Create a PR, with title "feat: TypeScript X.Y"
-// 10. Note that merging the PR doesn't trigger a release. Release are performed on a weekly schedule.
+//  3. Update `minNodeVersion` to the oldest LTS version of Node (i.e. dropping support for EOL versions of Node)
+//  4. Update the version list in the README (remember to remove EOS versions)
+//  5. If any versions dropped into EOS, add the respective branch to the "end-of-support" ruleset.
+//  6. `npx projen`
+//  7. `npx projen build` and resolve any new test failures that might be introduced by the new TS version
+//  8. Create a PR, with title "feat: TypeScript X.Y"
+//  9. Note that merging the PR doesn't trigger a release. Release are performed on a weekly schedule.
 //     You need to manually create a release by triggering this workflow:
 //     https://github.com/aws/jsii-compiler/actions/workflows/auto-tag-releases.yml
-// 11. Perform new version steps for `jsii-rosetta`
+// 10. Perform new version steps for `jsii-rosetta`
 
 const project = new typescript.TypeScriptProject({
   projenrcTs: true,

README.md

@@ -64,7 +64,8 @@ The current status of `jsii` compiler releases is:
 
 | Release | Status      | EOS        | Comment                                                                                 |
 | ------- | ----------- | ---------- | --------------------------------------------------------------------------------------- |
-| `5.6.x` | Current     | TBD        | ![npm](https://img.shields.io/npm/v/jsii/v5.6-latest?label=jsii%40v5.6-latest&logo=npm) |
+| `5.7.x` | Current     | TBD        | ![npm](https://img.shields.io/npm/v/jsii/v5.7-latest?label=jsii%40v5.7-latest&logo=npm) |
+| `5.6.x` | Maintenance | 2025-07-01 | ![npm](https://img.shields.io/npm/v/jsii/v5.6-latest?label=jsii%40v5.6-latest&logo=npm) |
 | `5.5.x` | Maintenance | 2025-05-15 | ![npm](https://img.shields.io/npm/v/jsii/v5.5-latest?label=jsii%40v5.5-latest&logo=npm) |
 | `5.4.x` | Maintenance | 2025-02-28 | ![npm](https://img.shields.io/npm/v/jsii/v5.4-latest?label=jsii%40v5.4-latest&logo=npm) |
 

projenrc/support.ts

@@ -2,7 +2,7 @@ import { JsonFile, Project } from 'projen';
 import type { ReleasesDocument } from '../src/support';
 
 export const SUPPORT_POLICY: ReleasesDocument = {
-  current: '5.6',
+  current: '5.7',
   maintenance: {
     // version: End-of-support date
     '5.0': new Date('2024-01-31'),
@@ -11,6 +11,7 @@ export const SUPPORT_POLICY: ReleasesDocument = {
     '5.3': new Date('2024-10-15'),
     '5.4': new Date('2025-02-28'),
     '5.5': new Date('2025-05-15'),
+    '5.6': new Date('2025-07-01'),
   },
 };