Intersection Type by markwpearce · Pull Request #1603 · rokucommunity/brighterscript

markwpearce · 2025-12-15T20:42:14Z

Adds IntersectionType modelled after TypeScript's intersection types

Add IntersectionType
Add parsing for <type> and <type>
Allow "Grouped types" in parser (eg: (type1 or type2) and (type3 or type4))
Update type compatibility and other helpers to work with intersection types
Verify scope validation
Use order of operations on types, eg. type foo = myType1 or myType2 and myType3 or myType4 => myType1 or (myType2 and myType3) or myType4
Make sure type MyKlassAA = MyKlass and roAssociativeArray works properly
Test intersections with callfuncs
Add docs

…n and using union type in BRS mode

src/parser/Parser.ts

src/types/UnionType.ts

…amic members

src/astUtils/reflection.ts

markwpearce · 2026-01-13T14:45:50Z

Accomplishes #1330

rokucommunity-bot · 2026-01-20T15:44:17Z

Hey there! I just built a new temporary npm package based on 5e648aa. You can download it here or install it by running the following command:

npm install https://github.com/rokucommunity/brighterscript/releases/download/v0.0.0-packages/brighterscript-1.0.0-alpha.49-intersection-type.20260120154200.tgz

TwitchBronBron

Just a few small things, but overall this looks great!

docs/intersection-types.md

src/astUtils/reflection.ts

TwitchBronBron · 2026-01-20T17:37:28Z

src/parser/Parser.ts

            }
        }
+        if (this.checkAny(TokenKind.And, TokenKind.Or)) {
+            this.warnIfNotBrighterScriptMode('custom types');


Is there a better name than custom types? I know this is configurable, but feels like it would better to say something like intersection or union?

src/parser/Parser.ts

rokucommunity-bot · 2026-01-20T17:50:07Z

Hey there! I just built a new temporary npm package based on d277935. You can download it here or install it by running the following command:

npm install https://github.com/rokucommunity/brighterscript/releases/download/v0.0.0-packages/brighterscript-1.0.0-alpha.49-intersection-type.20260120174746.tgz

Co-authored-by: Bronley Plumb <bronley@gmail.com>

rokucommunity-bot · 2026-01-20T18:05:56Z

Hey there! I just built a new temporary npm package based on 92a7755. You can download it here or install it by running the following command:

npm install https://github.com/rokucommunity/brighterscript/releases/download/v0.0.0-packages/brighterscript-1.0.0-alpha.49-intersection-type.20260120180333.tgz

…TypeWithDefault

rokucommunity-bot · 2026-01-22T13:17:04Z

Hey there! I just built a new temporary npm package based on db1138c. You can download it here or install it by running the following command:

npm install https://github.com/rokucommunity/brighterscript/releases/download/v0.0.0-packages/brighterscript-1.0.0-alpha.49-intersection-type.20260122131443.tgz

markwpearce added 13 commits December 5, 2025 14:32

wip

0d9745e

Merge branch 'v1' into intersection_type

4849aad

Merge branch 'v1' into intersection_type

a742506

Added IntersectionType tests

8fde59b

Added support for grouped type expressions

48ac3f0

Merge branch 'v1' into intersection_type

a602261

Adding tests for member types of intersection types in scope contexts

723b945

Adds code to handle order of operations when building types

e202859

Adds code to handle order of operations when building types

02ba2bb

removed log statments, started adding validation tests

29022b7

remove .only

6a73946

Better handling of errors - missing right paren on function declratio…

e49662b

…n and using union type in BRS mode

fix lint error

8f72d55