[TypeScript 3.7] add support for asserts keyword #6574
Description
Prettier 1.18.2
TypeScript is developing support for assertions in control flow analysis. The functionality is now available in development builds such as v3.7.0-dev.20190928. This ticket requests enabling Prettier support of the new asserts keyword.
--parser typescriptInput:
function assert(value: unknown): asserts value {
throw new Error()
}Output:
SyntaxError: '{' or ';' expected. (1:42)
> 1 | function assert(value: unknown): asserts value {
| ^
2 | throw new Error()
3 | }
4 | Expected behavior:
function assert(value: unknown): asserts value {
throw new Error()
}