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LibJS: Allow invalid string in tagged template literals
Since tagged template literals can inspect the raw string it is not a syntax error to have invalid escapes. However the cooked value should be `undefined`. We accomplish this by tracking whether parse_string_literal fails and then using a NullLiteral (since UndefinedLiteral is not a thing) and finally converting null in tagged template execution to undefined.
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5 changed files with 67 additions and 8 deletions
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@ -63,3 +63,9 @@ test("line continuation in literals (not characters)", () => {
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test("reference error from expressions", () => {
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expect(() => `${b}`).toThrowWithMessage(ReferenceError, "'b' is not defined");
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});
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test("invalid escapes should give syntax error", () => {
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expect("`\\u`").not.toEval();
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expect("`\\01`").not.toEval();
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expect("`\\u{10FFFFF}`").not.toEval();
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});
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