feat: enable numericSeparator parsing support (#11863)

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

@@ -1016,7 +1016,6 @@ export default class Tokenizer extends ParserErrors {
       const code = this.input.charCodeAt(this.state.pos);
       let val;
 
-      if (this.hasPlugin("numericSeparator")) {
       if (code === charCodes.underscore) {
         const prev = this.input.charCodeAt(this.state.pos - 1);
         const next = this.input.charCodeAt(this.state.pos + 1);
@@ -1038,7 +1037,6 @@ export default class Tokenizer extends ParserErrors {
         ++this.state.pos;
         continue;
       }
-      }
 
       if (code >= charCodes.lowercaseA) {
         val = code - charCodes.lowercaseA + charCodes.lineFeed;
@@ -1088,10 +1086,6 @@ export default class Tokenizer extends ParserErrors {
     }
     const next = this.input.charCodeAt(this.state.pos);
 
-    if (next === charCodes.underscore) {
-      this.expectPlugin("numericSeparator", this.state.pos);
-    }
-
     if (next === charCodes.lowercaseN) {
       ++this.state.pos;
       isBigInt = true;
@@ -1133,7 +1127,7 @@ export default class Tokenizer extends ParserErrors {
       const integer = this.input.slice(start, this.state.pos);
       if (this.state.strict) {
         this.raise(start, Errors.StrictOctalLiteral);
-      } else if (this.hasPlugin("numericSeparator")) {
+      } else {
         // disallow numeric separators in non octal decimals and legacy octal likes
         const underscorePos = integer.indexOf("_");
         if (underscorePos > 0) {
@@ -1165,10 +1159,6 @@ export default class Tokenizer extends ParserErrors {
       next = this.input.charCodeAt(this.state.pos);
     }
 
-    if (next === charCodes.underscore) {
-      this.expectPlugin("numericSeparator", this.state.pos);
-    }
-
     if (next === charCodes.lowercaseN) {
       // disallow floats, legacy octal syntax and non octal decimals
       // new style octal ("0o") is handled in this.readRadixNumber