feat: TypeScript 5.5 (#1256)

Closes #1255 

---

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

---------

Signed-off-by: github-actions <[email protected]>
Co-authored-by: github-actions <[email protected]>
Co-authored-by: Momo Kornher <[email protected]>

.projenrc.ts

@@ -6,20 +6,24 @@ import { SUPPORT_POLICY, SupportPolicy } from './projenrc/support';
 import { UpdateIntegPackage } from './projenrc/update-integ-package';
 import { UpgradeDependencies } from './projenrc/upgrade-dependencies';
 
-// See 'projenrc/support.ts' for TypeScript versions we are tracking. To add a new version:
+//  See 'projenrc/support.ts' for TypeScript versions we are tracking. To add a new version:
 //
-// 1. Fork the current `main` to a maintenance branch:
-//    `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
-// 3. Edit `support.ts`, maintenance EOL date for the current version is 6 months from
-//    today, 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. `npx projen`
-// 6. Update the version list in the README (remember to remove EOS versions)
-// 7. Create a PR
-// 8. Note that merging the PR doesn't trigger a release. Release are perfoemd on a weekly schedule, you should manully create a release by trigeeting this workflow:
-//    https://github.com/aws/jsii-compiler/actions/workflows/auto-tag-releases.yml
-// 9. Perform new version steps for `jsii-rosetta`
+//  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 branch for the version that is about to be replaced.
+//  3. Edit `projenrc/support.ts`, maintenance EOL date for the current 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. `npx projen`
+//  6. Update the version list in the README (remember to remove EOS versions)
+//  7. If any versions dropped into EOS, change the respective branch protection rule to include "Lock branch"
+//  8. Create a PR, with title "eat: 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
+// 10. Perform new version steps for `jsii-rosetta`
 
 const project = new typescript.TypeScriptProject({
   projenrcTs: true,

README.md

@@ -64,9 +64,9 @@ The current status of `jsii` compiler releases is:
 
 | Release | Status      | EOS        | Comment                                                                                 |
 | ------- | ----------- |------------| --------------------------------------------------------------------------------------- |
-| `5.4.x` | Current     | TBD        | ![npm](https://img.shields.io/npm/v/jsii/v5.4-latest?label=jsii%40v5.4-latest&logo=npm) |
+| `5.5.x` | Current     | TBD        | ![npm](https://img.shields.io/npm/v/jsii/v5.5-latest?label=jsii%40v5.5-latest&logo=npm) |
+| `5.4.x` | Maintenance | 2024-02-28 | ![npm](https://img.shields.io/npm/v/jsii/v5.4-latest?label=jsii%40v5.4-latest&logo=npm) |
 | `5.3.x` | Maintenance | 2024-10-07 | ![npm](https://img.shields.io/npm/v/jsii/v5.3-latest?label=jsii%40v5.3-latest&logo=npm) |
-| `5.2.x` | Maintenance | 2024-06-30 | ![npm](https://img.shields.io/npm/v/jsii/v5.2-latest?label=jsii%40v5.2-latest&logo=npm) |
 | `1.x`   | Maintenance | 2024-10-31 | <https://github.com/aws/jsii>                                                           |
 
 ## :balance_scale: License

projenrc/support.ts

@@ -2,13 +2,14 @@ import { JsonFile, Project } from 'projen';
 import type { ReleasesDocument } from '../src/support';
 
 export const SUPPORT_POLICY: ReleasesDocument = {
-  current: '5.4',
+  current: '5.5',
   maintenance: {
     // version: End-of-support date
     '5.0': new Date('2024-01-31'),
     '5.1': new Date('2024-02-28'),
     '5.2': new Date('2024-06-30'),
     '5.3': new Date('2024-10-15'),
+    '5.4': new Date('2025-02-28'),
   },
 };