tagged template literal can contain invalid escape sequence

[kdy1]

parser currently does not support parsing code like

latex`\unicode`

Note: this is valid only for es2018+
Implementor should check for the JscTarget.

This can be done by modifying code at

swc/ecmascript/parser/src/lexer/mod.rs

Lines 927 to 991 in 53b09aa

	fn read_tmpl_token(&mut self, start_of_tpl: BytePos) -> LexResult<Token> {
	let start = self.cur_pos();
	// TODO: Optimize
	let mut has_escape = false;
	let mut cooked = String::new();
	let mut raw = String::new();
	while let Some(c) = self.cur() {
	if c == '`' || (c == '$' && self.peek() == Some('{')) {
	if start == self.cur_pos() && self.state.last_was_tpl_element() {
	if c == '$' {
	self.bump();
	self.bump();
	return Ok(tok!("${"));
	} else {
	self.bump();
	return Ok(tok!('`'));
	}
	}
	// TODO: Handle error
	return Ok(Template {
	cooked: cooked.into(),
	raw: raw.into(),
	has_escape,
	});
	}
	if c == '\\' {
	has_escape = true;
	raw.push('\\');
	let mut wrapped = Raw(Some(raw));
	let ch = self.read_escaped_char(&mut wrapped)?;
	raw = wrapped.0.unwrap();
	if let Some(s) = ch {
	cooked.extend(s);
	}
	} else if c.is_line_break() {
	self.state.had_line_break = true;
	let c = if c == '\r' && self.peek() == Some('\n') {
	raw.push_str("\\r\\n");
	self.bump(); // '\r'
	'\n'
	} else {
	match c {
	'\n' => raw.push_str("\n"),
	'\r' => raw.push_str("\r"),
	'\u{2028}' => raw.push_str("\u{2028}"),
	'\u{2029}' => raw.push_str("\u{2029}"),
	_ => unreachable!(),
	}
	c
	};
	self.bump();
	cooked.push(c);
	} else {
	self.bump();
	cooked.push(c);
	raw.push(c);
	}
	}
	self.error(start_of_tpl, SyntaxError::UnterminatedTpl)?
	}

[swc-bot]

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