v2.x CI broken: TS1192 on @prefresh/vite and @tailwindcss/postcss since Deno v2.8.3 (TS 6.0)

[SisyphusZheng]

Symptom

Since June 11, 2026, all v2.x CI jobs fail at deno check --allow-import:

Found 2 errors.
error: Type checking failed.

Every open PR on v2.x shows the same failure.

Root Cause

Deno v2.8.3 bumped TypeScript from 5.9.2 to 6.0.3.
TS 6.0 changed export = in ESM context from warning to error.

Two dependencies have self-contradictory metadata:
.d.ts uses export = (CJS), package.json declares exports.import (ESM):

Import	File	Package	Error
import twPostcss from	plugin-tailwindcss/src/mod.ts:2	@tailwindcss/postcss@4.1.16	TS1192
import prefresh from	plugin-vite/src/mod.ts:9	@prefresh/vite@2.4.11	TS1192

Status

Dependency	Fix	Release
@tailwindcss/postcss	tailwindcss#20219 to tailwindcss#20228 merged	v4.3.1 (June 12)
@prefresh/vite	prefresh#625 to prefresh#626 merged	awaiting v2.x release

Temporary workaround

PR #3857 adds @ts-ignore TS1192 on both imports.
Once upstream releases land, this can be reverted.

Blocked PRs

~15 open PRs failing v2.x CI solely due to this pre-existing issue.
None of the per-PR changes are the cause.
All should become green after #3857 merges or upstream fixes land.