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I set up a new project using the yeoman template for SharePoint Framework web parts. Everything is working fine, I can run gulp serve and work in the local workbench. Good.
Now I need to change the TypeScript version. When running gulp serve the console is showing:
[09:12:38] [typescript] TypeScript version: 2.1.6
Where does this version come from? How can I bump this to 2.2.x?
The mystery is solved. The typescript version is pulled in by tslint and in turn by the internal gulp-related typescript.
The output of "TypeScript version: 2.1.6" happens when the tslint task starts a typescript compilation:
Looking at the "package.json" in "node_modules/@microsoft/sp-tslint-rules" I can see this typescript dependency:
"@microsoft/gulp-core-build-typescript": ">=2.2.5 <3.0.0",
Now looking in "package.json" of "gulp-core-build-typescript" I see this typescript dependency:
"typescript": "~2.1.4"
This means: the highest typescript version starting with "2.1" will be used.
Looking at the available typescript versions shows "2.1.6" as being the highest one available:
npm view typescript versions --json
So that's why the version is 2.1.6. And since it's part of a chain of packages working together I won't touch it.
