devtools: update jest config

This change updates the jest config to specify
test environments separately for unit and e2e
tests and adds the isolated modules option to
the ts-jest config to improve test startup time.

For golang/go#43361

Change-Id: I3fbfae2a42c26bd0eeb2d235dab1cced0c8701ea
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/280711
Trust: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/devtools/config/jest.config.js b/devtools/config/jest.config.js
index 1622999e..8aa1583d 100644
--- a/devtools/config/jest.config.js
+++ b/devtools/config/jest.config.js
@@ -2,5 +2,9 @@
 module.exports = {
   preset: 'ts-jest',
   rootDir: '../../',
-  testEnvironment: 'node',
+  globals: {
+    'ts-jest': {
+      isolatedModules: true,
+    },
+  },
 };