Fix line continuation with Unicode line terminators (#9403)

packages/babel-parser/src/tokenizer/index.js

@@ -1213,6 +1213,8 @@ export default class Tokenizer extends LocationParser {
       case charCodes.lineFeed:
         this.state.lineStart = this.state.pos;
         ++this.state.curLine;
+      case charCodes.lineSeparator:
+      case charCodes.paragraphSeparator:
         return "";
       default:
         if (ch >= charCodes.digit0 && ch <= charCodes.digit7) {
@@ -1242,6 +1244,7 @@ export default class Tokenizer extends LocationParser {
           this.state.pos += octalStr.length - 1;
           return String.fromCharCode(octal);
         }
+
         return String.fromCharCode(ch);
     }
   }

packages/babel-parser/test/fixtures/es2015/uncategorised/22/input.js

@@ -1,3 +1,3 @@
 `\n\r\b\v\t\f\
 \
-`
+\
\
`

packages/babel-parser/test/fixtures/es2015/uncategorised/22/output.json

@@ -1,7 +1,7 @@
 {
   "type": "File",
   "start": 0,
-  "end": 18,
+  "end": 22,
   "loc": {
     "start": {
       "line": 1,
@@ -9,13 +9,13 @@
     },
     "end": {
       "line": 3,
-      "column": 1
+      "column": 5
     }
   },
   "program": {
     "type": "Program",
     "start": 0,
-    "end": 18,
+    "end": 22,
     "loc": {
       "start": {
         "line": 1,
@@ -23,7 +23,7 @@
       },
       "end": {
         "line": 3,
-        "column": 1
+        "column": 5
       }
     },
     "sourceType": "script",
@@ -32,7 +32,7 @@
       {
         "type": "ExpressionStatement",
         "start": 0,
-        "end": 18,
+        "end": 22,
         "loc": {
           "start": {
             "line": 1,
@@ -40,13 +40,13 @@
           },
           "end": {
             "line": 3,
-            "column": 1
+            "column": 5
           }
         },
         "expression": {
           "type": "TemplateLiteral",
           "start": 0,
-          "end": 18,
+          "end": 22,
           "loc": {
             "start": {
               "line": 1,
@@ -54,7 +54,7 @@
             },
             "end": {
               "line": 3,
-              "column": 1
+              "column": 5
             }
           },
           "expressions": [],
@@ -62,7 +62,7 @@
             {
               "type": "TemplateElement",
               "start": 1,
-              "end": 17,
+              "end": 21,
               "loc": {
                 "start": {
                   "line": 1,
@@ -70,11 +70,11 @@
                 },
                 "end": {
                   "line": 3,
-                  "column": 0
+                  "column": 4
                 }
               },
               "value": {
-                "raw": "\\n\\r\\b\\v\\t\\f\\\n\\\n",
+                "raw": "\\n\\r\\b\\v\\t\\f\\\n\\\n\\\u2028\\\u2029",
                 "cooked": "\n\r\b\u000b\t\f"
               },
               "tail": true