feat: run tsc -noemit on TS files during lint-staged (#135)

* Run tsc on staged files when TypeScript is enabled

README.md

@@ -125,7 +125,7 @@ add `@babel/preset-flow` to the `presets`-section.
 
 ### TypeScript Support
 
-If the `tsconfig.json`-file is present in the project root directory and the
+If the `tsconfig.json`-file is present in the project root directory and 
 `typescript` is a dependency the `@babel/preset-typescript` will automatically
 get loaded when you use the default babel config that comes with `kcd-scripts`.
 If you customised your `.babelrc`-file you might need to manually add
@@ -134,6 +134,8 @@ If you customised your `.babelrc`-file you might need to manually add
 `kcd-scripts` will automatically load any `.ts` and `.tsx` files, including the
 default entry point, so you don't have to worry about any rollup configuration.
 
+`tsc --noemit` will run during lint-staged to verify that files will compile.
+
 ## Inspiration
 
 This is inspired by `react-scripts`.

src/config/lintstagedrc.js

@@ -1,4 +1,4 @@
-const {resolveKcdScripts, resolveBin} = require('../utils')
+const {resolveKcdScripts, resolveBin, ifTypescript} = require('../utils')
 
 const kcdScripts = resolveKcdScripts()
 const doctoc = resolveBin('doctoc')
@@ -10,4 +10,5 @@ module.exports = {
     `${kcdScripts} lint`,
     `${kcdScripts} test --findRelatedTests`,
   ],
+  '*.+(ts|tsx)': ifTypescript ? [`tsc --noEmit`] : undefined,
 }