Project: microsoft/TypeScript https://github.com/microsoft/TypeScript
File: src/compiler/utilities.ts:3549 https://github.com/microsoft/TypeScript/blob/cbac1ddfc73ca3b9d8741c1b51b74663a0f24695/src/compiler/utilities.ts#L3549

function isExpressionNode(node: Node): boolean

SVG:
dark https://tmr232.github.io/function-graph-overview/render/?github=https%3A%2F%2Fgithub.com%2Fmicrosoft%2FTypeScript%2Fblob%2Fcbac1ddfc73ca3b9d8741c1b51b74663a0f24695%2Fsrc%2Fcompiler%2Futilities.ts%23L3549&colors=dark
light https://tmr232.github.io/function-graph-overview/render/?github=https%3A%2F%2Fgithub.com%2Fmicrosoft%2FTypeScript%2Fblob%2Fcbac1ddfc73ca3b9d8741c1b51b74663a0f24695%2Fsrc%2Fcompiler%2Futilities.ts%23L3549&colors=light

@buherator @cfgbot I just checked it, seems like a weird artifact of how I build switch-cases.
I am probably going to collapse that entire beautiful tree into a single node in a future version... (will keep it as a configurable option, though)