Read UNEXPECTED_FULL_TRACE and UNEXPECTED_DEPTH in deno if the script…

… has access to environment variables

lib/defaultDepth.js

@@ -1,3 +1,5 @@
+const utils = require('./utils');
+
 let defaultDepth = 3;
 const matchDepthParameter =
   typeof window !== 'undefined' &&
@@ -6,7 +8,10 @@ const matchDepthParameter =
 
 if (matchDepthParameter) {
   defaultDepth = parseInt(matchDepthParameter[1], 10);
-} else if (typeof process !== 'undefined' && process.env.UNEXPECTED_DEPTH) {
-  defaultDepth = parseInt(process.env.UNEXPECTED_DEPTH, 10);
+} else {
+  const defaultDepthFromEnv = utils.getEnv('UNEXPECTED_DEPTH');
+  if (defaultDepthFromEnv) {
+    defaultDepth = parseInt(defaultDepthFromEnv, 10);
+  }
 }
 module.exports = defaultDepth;

lib/useFullStackTrace.js

@@ -1,16 +1,14 @@
 const Promise = require('unexpected-bluebird');
+const utils = require('./utils');
+
 let useFullStackTrace = false;
 if (typeof window !== 'undefined' && typeof window.location !== 'undefined') {
   useFullStackTrace = !!window.location.search.match(
     /[?&]full-trace=true(?:$|&)/
   );
 }
 
-if (
-  typeof process !== 'undefined' &&
-  process.env &&
-  process.env.UNEXPECTED_FULL_TRACE
-) {
+if (utils.getEnv('UNEXPECTED_FULL_TRACE')) {
   Promise.longStackTraces();
   useFullStackTrace = true;
 }

lib/utils.js

@@ -1,4 +1,6 @@
 /* eslint-disable no-proto */
+/* global Deno */
+
 const canSetPrototype =
   Object.setPrototypeOf || { __proto__: [] } instanceof Array;
 const greedyIntervalPacker = require('greedy-interval-packer');
@@ -358,5 +360,13 @@ const utils = (module.exports = {
     } else {
       return subject.substring(contextLength, subject.length);
     }
+  },
+
+  getEnv(varName) {
+    if (typeof Deno === 'object' && Deno.permissions().env) {
+      return Deno.env()[varName];
+    } else if (typeof process === 'object' && process.env) {
+      return process.env[varName];
+    }
   }
 });