drop support for old hhvm version

Author: azjezz

.hhconfig

@@ -6,3 +6,5 @@ const_default_func_args = true
 disallow_array_literal = true
 disable_lval_as_an_expression = true
 ignored_paths = [ "vendor/.+/tests/.+", "vendor/.+/bin/.+" ]
+allowed_decl_fixme_codes=2053,4045,4047
+allowed_fixme_codes_strict=2011,2049,2050,2053,2083,3084,4027,4045,4047,4104,4106,4107,4108,4110,4128,4135,4188,4200,4223,4248,4240,4323

composer.json

@@ -14,13 +14,17 @@
         }
     ],
     "require": {
-        "hhvm": "^4.25",
-        "hhvm/type-assert": "^3.6"
+        "hhvm": "~4.83.1 || ~4.84.0",
+        "hhvm/type-assert": "^4.1.2"
     },
     "require-dev": {
-        "facebook/fbexpect": "^2.7",
+        "facebook/difflib": "^1.1.1",
+        "facebook/fbexpect": "^2.7.7",
+        "facebook/hh-clilib": "^2.5.2",
         "hhvm/hacktest": "^2.0",
-        "hhvm/hhast": "^4.25"
+        "hhvm/hhast": "^4.82.2",
+        "hhvm/hhvm-autoload": "^3.1.6",
+        "hhvm/type-assert": "^4.1.2"
     },
     "scripts": {
         "check": [

src/Nuxed/Json/decode.hack

@@ -9,7 +9,12 @@ function decode(string $json, bool $assoc = true): dynamic {
       $json,
       $assoc,
       512,
-      \JSON_BIGINT_AS_STRING | \JSON_FB_HACK_ARRAYS,
+      \JSON_BIGINT_AS_STRING |
+        (
+          \defined('JSON_FB_HACK_ARRAYS')
+            ? \constant('\JSON_FB_HACK_ARRAYS')
+            : 0
+        ),
     );
   } catch (\Throwable $e) {
     // assoc = true & invalid property name results in `\Error`

src/Nuxed/Json/encode.hack

@@ -7,6 +7,7 @@ function encode(mixed $value, bool $pretty = false, int $flags = 0): string {
   $flags |= \JSON_UNESCAPED_UNICODE |
     \JSON_UNESCAPED_SLASHES |
     \JSON_PRESERVE_ZERO_FRACTION;
+
   if ($pretty) {
     $flags |= \JSON_PRETTY_PRINT;
   }

src/Nuxed/Json/spec.hack

@@ -7,6 +7,7 @@ use namespace Facebook\{TypeAssert, TypeSpec};
  */
 function spec<T>(string $json, TypeSpec\TypeSpec<T> $spec): T {
   $value = decode($json);
+
   try {
     return $spec->assertType($value);
   } catch (TypeAssert\IncorrectTypeException $e) {