diff --git a/.gitignore b/.gitignore
index 3059a185..245f7bd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ package-lock.json
 ./test/fixtures/package.json
 coverage
 build
+example.*
diff --git a/lib/yargs-parser.ts b/lib/yargs-parser.ts
index 90078178..0b29c9aa 100644
--- a/lib/yargs-parser.ts
+++ b/lib/yargs-parser.ts
@@ -660,7 +660,10 @@ export class YargsParser {
 
             setConfigObject(config)
           } catch (ex) {
-            if (argv[configKey]) error = Error(__('Invalid JSON config file: %s', configPath))
+            // Deno will receive a PermissionDenied error if an attempt is
+            // made to load config without the --allow-read flag:
+            if (ex.name === 'PermissionDenied') error = ex
+            else if (argv[configKey]) error = Error(__('Invalid JSON config file: %s', configPath))
           }
         }
       })
diff --git a/test/typescript/tokenize-arg-string.ts b/test/typescript/tokenize-arg-string.ts
index 70d76ee3..ff8d486f 100644
--- a/test/typescript/tokenize-arg-string.ts
+++ b/test/typescript/tokenize-arg-string.ts
@@ -1,7 +1,6 @@
 /* global describe, it */
 import { strictEqual } from 'assert'
 import { tokenizeArgString } from '../../lib/tokenize-arg-string.js'
-import { expect } from 'chai'
 
 describe('TokenizeArgString', function () {
   it('handles unquoted string', function () {
@@ -24,109 +23,109 @@ describe('TokenizeArgString', function () {
 
   it('handles single quoted string with spaces', function () {
     const args = tokenizeArgString("--foo 'hello world' --bar='foo bar'")
-    args[0].should.equal('--foo')
-    args[1].should.equal("'hello world'")
-    args[2].should.equal("--bar='foo bar'")
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], "'hello world'")
+    strictEqual(args[2], "--bar='foo bar'")
   })
 
   it('handles double quoted string with spaces', function () {
     const args = tokenizeArgString('--foo "hello world" --bar="foo bar"')
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello world"')
-    args[2].should.equal('--bar="foo bar"')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '"hello world"')
+    strictEqual(args[2], '--bar="foo bar"')
   })
 
   it('handles single quoted empty string', function () {
     const args = tokenizeArgString('--foo \'\' --bar=\'\'')
-    args[0].should.equal('--foo')
-    args[1].should.equal("''")
-    args[2].should.equal("--bar=''")
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], "''")
+    strictEqual(args[2], "--bar=''")
   })
 
   it('handles double quoted empty string', function () {
     const args = tokenizeArgString('--foo "" --bar=""')
-    args[0].should.equal('--foo')
-    args[1].should.equal('""')
-    args[2].should.equal('--bar=""')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '""')
+    strictEqual(args[2], '--bar=""')
   })
 
   it('handles quoted string with embedded quotes', function () {
     var args = tokenizeArgString('--foo "hello \'world\'" --bar=\'foo "bar"\'')
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello \'world\'"')
-    args[2].should.equal('--bar=\'foo "bar"\'')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '"hello \'world\'"')
+    strictEqual(args[2], '--bar=\'foo "bar"\'')
   })
 
   // https://github.com/yargs/yargs-parser/pull/100
   // https://github.com/yargs/yargs-parser/pull/106
   it('ignores unneeded spaces', function () {
     const args = tokenizeArgString('  foo  bar  "foo  bar"  ')
-    args[0].should.equal('foo')
-    expect(args[1]).equal('bar')
-    expect(args[2]).equal('"foo  bar"')
+    strictEqual(args[0], 'foo')
+    strictEqual(args[1], 'bar')
+    strictEqual(args[2], '"foo  bar"')
   })
 
   it('handles boolean options', function () {
     const args = tokenizeArgString('--foo -bar')
-    expect(args[0]).to.equal(('--foo'))
-    expect(args[1]).to.equal(('-bar'))
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '-bar')
   })
 
   it('handles empty string', function () {
     const args = tokenizeArgString('')
-    expect(args.length).to.equal(0)
+    strictEqual(args.length, 0)
   })
 
   it('handles array with unquoted string', function () {
     const args = tokenizeArgString(['--foo', '99'])
-    args[0].should.equal('--foo')
-    args[1].should.equal('99')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '99')
   })
 
   it('handles array with quoted string with no spaces', function () {
     const args = tokenizeArgString(['--foo', "'hello'"])
-    args[0].should.equal('--foo')
-    args[1].should.equal("'hello'")
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], "'hello'")
   })
 
   it('handles array with single quoted string with spaces', function () {
     const args = tokenizeArgString(['--foo', "'hello world'", "--bar='foo bar'"])
-    args[0].should.equal('--foo')
-    args[1].should.equal("'hello world'")
-    args[2].should.equal("--bar='foo bar'")
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], "'hello world'")
+    strictEqual(args[2], "--bar='foo bar'")
   })
 
   it('handles array with double quoted string with spaces', function () {
     const args = tokenizeArgString(['--foo', '"hello world"', '--bar="foo bar"'])
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello world"')
-    args[2].should.equal('--bar="foo bar"')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '"hello world"')
+    strictEqual(args[2], '--bar="foo bar"')
   })
 
   it('handles array with single quoted empty string', function () {
     const args = tokenizeArgString(['--foo', "''", "--bar=''"])
-    args[0].should.equal('--foo')
-    args[1].should.equal("''")
-    args[2].should.equal("--bar=''")
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], "''")
+    strictEqual(args[2], "--bar=''")
   })
 
   it('handles array with double quoted empty string', function () {
     const args = tokenizeArgString(['--foo', '""', '--bar=""'])
-    args[0].should.equal('--foo')
-    args[1].should.equal('""')
-    args[2].should.equal('--bar=""')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '""')
+    strictEqual(args[2], '--bar=""')
   })
 
   it('handles array with quoted string with embedded quotes', function () {
     var args = tokenizeArgString(['--foo', '"hello \'world\'"', '--bar=\'foo "bar"\''])
-    args[0].should.equal('--foo')
-    args[1].should.equal('"hello \'world\'"')
-    args[2].should.equal('--bar=\'foo "bar"\'')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '"hello \'world\'"')
+    strictEqual(args[2], '--bar=\'foo "bar"\'')
   })
 
   it('handles array with boolean options', function () {
     const args = tokenizeArgString(['--foo', '-bar'])
-    expect(args[0]).to.equal('--foo')
-    expect(args[1]).to.equal('-bar')
+    strictEqual(args[0], '--foo')
+    strictEqual(args[1], '-bar')
   })
 })