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Description
TypeScript Version: 4.2.0-dev.20201201
Search Terms: exponentiation, await
Code
await a as any ** 1
Expected behavior: Parser should throw
An unary expression with the 'await' operator is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.
Actual behavior: Does not throw
Playground Link: https://www.typescriptlang.org/play?ts=4.2.0-dev.20201201#code/G4QwTgBCELwQCmA9gWwJYGcCmA6MWMkAbYLACgEYBKAbgCgQMBPAOwGMIyrYA+KAdxBoALlCgYoLJhABUMiBSA
Related Issues: https://github.com/microsoft/TypeScript/issues/40916, since in November meeting we have reached consensus that await x ** 1 is illegal and the parser already throws on await a! ** 1, I think it should either throw for await a as any ** 1, or add parenthesis in the output for await a if as any serves as an implicit parenthesis.