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More permissive parsing of instantiation expressions (#48659)

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* More permissive parsing of expressions with type arguments

* Add test
This commit is contained in:
Anders Hejlsberg
2022-04-13 06:16:43 -07:00
committed by GitHub
parent 988fa85f88
commit a027cfa8ac
6 changed files with 42 additions and 26 deletions
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28
src/compiler/parser.ts
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@@ -5735,34 +5735,10 @@ namespace ts {
case SyntaxKind.OpenParenToken: // foo<x>(
case SyntaxKind.NoSubstitutionTemplateLiteral: // foo<T> `...`
case SyntaxKind.TemplateHead: // foo<T> `...${100}...`
// These tokens can't follow in a call expression, nor can they start an
// expression. So, consider the type argument list part of an instantiation
// expression.
// falls through
case SyntaxKind.CommaToken: // foo<x>,
case SyntaxKind.DotToken: // foo<x>.
case SyntaxKind.QuestionDotToken: // foo<x>?.
case SyntaxKind.CloseParenToken: // foo<x>)
case SyntaxKind.CloseBracketToken: // foo<x>]
case SyntaxKind.ColonToken: // foo<x>:
case SyntaxKind.SemicolonToken: // foo<x>;
case SyntaxKind.QuestionToken: // foo<x>?
case SyntaxKind.EqualsEqualsToken: // foo<x> ==
case SyntaxKind.EqualsEqualsEqualsToken: // foo<x> ===
case SyntaxKind.ExclamationEqualsToken: // foo<x> !=
case SyntaxKind.ExclamationEqualsEqualsToken: // foo<x> !==
case SyntaxKind.AmpersandAmpersandToken: // foo<x> &&
case SyntaxKind.BarBarToken: // foo<x> ||
case SyntaxKind.QuestionQuestionToken: // foo<x> ??
case SyntaxKind.CaretToken: // foo<x> ^
case SyntaxKind.AmpersandToken: // foo<x> &
case SyntaxKind.BarToken: // foo<x> |
case SyntaxKind.CloseBraceToken: // foo<x> }
case SyntaxKind.EndOfFileToken: // foo<x>
return true;
}
// Treat anything else as an expression.
return false;
// Consider something a type argument list only if the following token can't start an expression.
return !isStartOfExpression();
}
function parsePrimaryExpression(): PrimaryExpression {