Open
Description
🔎 Search Terms
- Unicode escape sequences
- extended Unicode escapes
- variables, constants, property names, JSX identifiers, JSX attribute names…
- regular expression group names, RegExp identifiers
- bundling & transpilation
🕗 Version & Regression Information
- This is the behavior since Support extended unicode escapes in identifiers, per es6 spec #32725 lands
⏯ Playground Link
💻 Code
const a\u{62}c\u{64}e = 42;
abcde; // Error: Cannot find name 'abcde'. Did you mean 'a\u{62}c\u{64}e'?
abde; // No error
const \u{76}ar\u{69}able = 42;
variable; // Error: Cannot find name 'variable'. Did you mean '\u{76}ar\u{69}able'?
viable; // No error
🙁 Actual behavior
abde
and viable
are recognised but not abcde
and variable
.
🙂 Expected behavior
abcde
and variable
are recognised but not abde
and viable
.
Additional information about the issue
Precisely, text between a 4-digit or extended Unicode escape and an extended Unicode escape is ignored.
(This is not the case for text between a 4-digit or extended Unicode escape and a 4-digit Unicode escape.)
This happens with all kinds of identifiers, not just variable names, due to the missing line result += text.substring(start, pos);
. This issue is opened just for trackability and is fixed in #61042.