src: use non-deprecated versions of `->To*()` utils

Squashed from multiple commits:

- src: replace ->To*(isolate) with ->To*(context).ToLocalChecked()

- test: use .As<Object> on Exception::Error

  > Exception::Error always returns an object, so e.As<Object>() should also work fine
  See https://github.com/nodejs/node/pull/17343#discussion_r153232027

- test: use .As<Object> instead of ->ToObject

  we already checked that its a buffer

- src: use FromMaybe instead of ToLocalChecked

  It fixed this test case: 19a1b2e414

- src: pass context to Get()

  Dont pass Local<Context> is deprecated soon.
  So we migrate to maybe version.

- src: return if Get or ToObject return an empty before call ToLocalChecked

Refs: https://github.com/nodejs/node/issues/17244
PR-URL: https://github.com/nodejs/node/pull/17343
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/process_wrap.cc b/src/process_wrap.cc
index 3667b0449e..b01ef56270 100644
--- a/src/process_wrap.cc
+++ b/src/process_wrap.cc
@@ -143,7 +143,8 @@ class ProcessWrap : public HandleWrap {
     ProcessWrap* wrap;
     ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
 
-    Local<Object> js_options = args[0]->ToObject(env->isolate());
+    Local<Object> js_options =
+        args[0]->ToObject(env->context()).ToLocalChecked();
 
     uv_process_options_t options;
     memset(&options, 0, sizeof(uv_process_options_t));