Add support for comments

npm/index.js

@@ -399,6 +399,33 @@ function* parseJson(stdin) {
     while (isWhitespace(lastChar)) {
       next()
     }
+    skipComment()
+  }
+
+  function skipComment() {
+    if (lastChar === '/') {
+      next()
+      if (lastChar === '/') {
+        while (!done && lastChar !== '\n') {
+          next()
+        }
+        skipWhitespace()
+      } else if (lastChar === '*') {
+        while (!done) {
+          next()
+          if (lastChar === '*') {
+            next()
+            if (lastChar === '/') {
+              next()
+              break
+            }
+          }
+        }
+        skipWhitespace()
+      } else {
+        throw new SyntaxError(errorSnippet())
+      }
+    }
   }
 
   function isWhitespace(ch) {

npm/test.js

@@ -69,6 +69,11 @@ void async function main() {
     t.equal(stdout, '[\n  1\n]\n')
   })
 
+  await test('parseJson - comments', async t => {
+    const {stdout} = await run('/* comment */ [1 // comment\n]')
+    t.equal(stdout, '[\n  1\n]\n')
+  })
+
   await test('transform - anonymous function', async t => {
     const {stdout} = await run({'key': 'value'}, '\'function (x) { return x.key }\'')
     t.equal(stdout, 'value\n')