BREAKING: `DENO_FUTURE=1` by default, or welcome to Deno 2.0 (#25213)

This commit effectively turns Deno into Deno 2.0.

This is done by forcing `DENO_FUTURE=1` env var, that was available in
the past few months to try Deno 2 changes.

This commit contains several breaking changes scheduled for Deno 2:
- all deprecated JavaScript APIs are not available any more, mostly
`Deno.*` APIs
- `window` global is removed
- FFI, WebGPU and FS APIs are now stable and don't require
`--unstable-*` flags
- import assertions are no longer supported
- "bring your own node modules" is enabled by default

This is the first commit in a series that are scheduled before the Deno
2 release.

Follow up work is tracked in
https://github.com/denoland/deno/issues/25241.

---------

Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>
Co-authored-by: Nayeem Rahman <nayeemrmn99@gmail.com>
Co-authored-by: Nathan Whitaker <nathan@deno.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/unit/test_util.ts b/tests/unit/test_util.ts
index 16ca735ac..e78afb828 100644
--- a/tests/unit/test_util.ts
+++ b/tests/unit/test_util.ts
@@ -25,7 +25,8 @@ export { delay } from "@std/async/delay";
 export { readLines } from "@std/io/read-lines";
 export { parseArgs } from "@std/cli/parse-args";
 
-export const DENO_FUTURE = Deno.env.get("DENO_FUTURE") === "1";
+// TODO(2.0): remove this and all the tests that depend on it.
+export const DENO_FUTURE = true;
 
 export function pathToAbsoluteFileUrl(path: string): URL {
   path = resolve(path);