[parser] Exception to 8 and 9 in tagged template (#10567)

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

@@ -1239,6 +1239,14 @@ export default class Tokenizer extends LocationParser {
       case charCodes.lineSeparator:
       case charCodes.paragraphSeparator:
         return "";
+      case charCodes.digit8:
+      case charCodes.digit9:
+        if (inTemplate) {
+          const codePos = this.state.pos - 1;
+
+          this.state.invalidTemplateEscapePosition = codePos;
+          return null;
+        }
       default:
         if (ch >= charCodes.digit0 && ch <= charCodes.digit7) {
           const codePos = this.state.pos - 1;

packages/babel-parser/test/fixtures/core/escape-template/non-octal/eight/input.js

@@ -0,0 +1 @@
+`\8`;

packages/babel-parser/test/fixtures/core/escape-template/non-octal/eight/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Invalid escape sequence in template (1:2)"
+}

packages/babel-parser/test/fixtures/core/escape-template/non-octal/nine/input.js

@@ -0,0 +1 @@
+`\9`;

packages/babel-parser/test/fixtures/core/escape-template/non-octal/nine/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Invalid escape sequence in template (1:2)"
+}