From 08be12bc74f54d42852b5a01222c324aa29a1bea Mon Sep 17 00:00:00 2001
From: Adrian Heine <mail@adrianheine.de>
Date: Tue, 16 Oct 2018 20:40:02 +0200
Subject: [PATCH] Transpile U+2028 and U+2029 (json-superset)

---
 src/program/types/Literal.js  | 11 +++++++++++
 test/samples/json-superset.js | 12 ++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 test/samples/json-superset.js

diff --git a/src/program/types/Literal.js b/src/program/types/Literal.js
index 379f9a81..8be87946 100644
--- a/src/program/types/Literal.js
+++ b/src/program/types/Literal.js
@@ -2,6 +2,8 @@ import Node from '../Node.js';
 import CompileError from '../../utils/CompileError.js';
 import rewritePattern from 'regexpu-core';
 
+const nonAsciiLsOrPs = /[\u2028-\u2029]/g;
+
 export default class Literal extends Node {
 	initialise() {
 		if (typeof this.value === 'string') {
@@ -37,6 +39,15 @@ export default class Literal extends Node {
 					}
 				);
 			}
+		} else if (typeof this.value === "string" && this.value.match(nonAsciiLsOrPs)) {
+			code.overwrite(
+				this.start,
+				this.end,
+				this.raw.replace(nonAsciiLsOrPs, m => m == '\u2028' ? '\\u2028' : '\\u2029'),
+				{
+					contentOnly: true
+				}
+			);
 		}
 	}
 }
diff --git a/test/samples/json-superset.js b/test/samples/json-superset.js
new file mode 100644
index 00000000..51a31631
--- /dev/null
+++ b/test/samples/json-superset.js
@@ -0,0 +1,12 @@
+module.exports = [
+	{
+		description: 'transpiles U+2028 LINE SEPARATOR',
+		input: `const x = "a\u2028b\u1010"`,
+		output: `var x = "a\\u2028b\u1010"`
+	},
+	{
+		description: 'transpiles U+2029 PARAGRAPH SEPARATOR',
+		input: `const x = "a\u2029b\u1010"`,
+		output: `var x = "a\\u2029b\u1010"`
+	}
+]