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no-octal-escape

As of the ECMAScript 5 specification, octal escape sequences in string literals are deprecated and should not be used. Unicode escape sequences should be used instead.

— The eslint docs

Octal escape sequences, such as "\45", which is equal to "%", can be used to represent characters by extended-ASCII character code numbers in octal. In strict mode, this is a syntax error.

— MDN about Strict mode

See also the MDN page about the related SyntaxError