feat: TypeScript 5.4 (#855)

[TypeScript 5.4 has been
released](https://devblogs.microsoft.com/typescript/announcing-typescript-5-4/).
This moves jsii-compiler 5.3 into maintenance mode.

---

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

.projenrc.ts

@@ -10,13 +10,13 @@ import { UpgradeDependencies } from './projenrc/upgrade-dependencies';
 // 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/v5.2`
+//    `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.
+// 6. Update the version list in the README (remember to remove EOS versions)
 // 7. Create a PR
 // 8. Perform new version steps for `jsii-rosetta`
 
@@ -239,6 +239,7 @@ project.preCompileTask.exec('ts-node build-tools/code-gen.ts', {
   name: 'code-gen',
 });
 project.gitignore.addPatterns('/src/version.ts', '/jsii-outdir/', '/test/negatives/.*');
+project.gitignore.exclude('.DS_Store');
 
 // Exclude negatives from tsconfig and eslint...
 project.tsconfigDev.addExclude('test/negatives/**/*.ts');

README.md

@@ -62,13 +62,12 @@ The applicable _Maintenance & Support policy_ can be reviewed in [SUPPORT.md](./
 
 The current status of `jsii` compiler releases is:
 
-| Release | Status      | Comment                                                                                 |
-| ------- | ----------- | --------------------------------------------------------------------------------------- |
-| `5.3.x` | Current     | ![npm](https://img.shields.io/npm/v/jsii/v5.3-latest?label=jsii%40v5.3-latest&logo=npm) |
-| `5.2.x` | Maintenance | ![npm](https://img.shields.io/npm/v/jsii/v5.2-latest?label=jsii%40v5.2-latest&logo=npm) |
-| `5.1.x` | Maintenance | ![npm](https://img.shields.io/npm/v/jsii/v5.1-latest?label=jsii%40v5.1-latest&logo=npm) |
-| `5.0.x` | Maintenance | ![npm](https://img.shields.io/npm/v/jsii/v5.0-latest?label=jsii%40v5.0-latest&logo=npm) |
-| `1.x`   | Maintenance | <https://github.com/aws/jsii>                                                           |
+| 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) |
+| `5.3.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

@@ -2,12 +2,13 @@ import { JsonFile, Project } from 'projen';
 import type { ReleasesDocument } from '../src/support';
 
 export const SUPPORT_POLICY: ReleasesDocument = {
-  current: '5.3',
+  current: '5.4',
   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'),
   },
 };