Nothing in your tsconfig sets types.

TypeScript 6 changed what that means.

TypeScript 5.9.3 — loaded them all

GLOBALS IN SCOPE

✓process.env
✓describe(), it()
✓Buffer, setImmediate

AND THE BUILT-IN MODULES

✓import ... from "node:fs" every package under node_modules/@types was a
global, imported or not

the file that did not change

TSCONFIG.JSON

{
  "compilerOptions": {
    "module": "nodenext",
    "strict": true
  },
  "include": ["src"]
}

no "types" entry — that is
the whole difference

TypeScript 6.0.3 and 7.0.2 — default is []

WHAT THE COMPILER SAYS

src/index.ts(3,28): error TS2591: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig.

AND THE IMPORT WITH IT

✕import ... from "node:fs" those declarations live in @types/node too, and
nothing else puts them in the program

the one line back add "types": ["node"] to every tsconfig that needs the globals. ["*"] restores the old sweep, but only on 6.0 and up

TypeScript 5.9.3 · 6.0.3 · 7.0.2 side by side · @types/node 26.5.1 · the error above is captured from the demo's own run

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