Merge branch 'master' of github.com:Rich-Harris/devalue

Author: Rich-Harris

src/utils.js

@@ -63,6 +63,8 @@ export function stringify_string(str) {
 			result += '\\"';
 		} else if (char in escaped) {
 			result += escaped[char];
+		} else if (code <= 0x001F) {
+			result += `\\u${code.toString(16).toUpperCase().padStart(4, "0")}`
 		} else if (code >= 0xd800 && code <= 0xdfff) {
 			const next = str.charCodeAt(i + 1);
 

test/test.js

@@ -200,6 +200,18 @@ const fixtures = {
 			js: '"\\u0000"',
 			json: '["\\u0000"]'
 		},
+		{
+			name: 'control character',
+			value: '\u0001',
+			js: '"\\u0001"',
+			json: '["\\u0001"]'
+		},
+		{
+			name: 'control character extremum',
+			value: '\u001F',
+			js: '"\\u001F"',
+			json: '["\\u001F"]'
+		},
 		{
 			name: 'backslash',
 			value: '\\',