symbol is not a valid type, when it is?

[maraisr]

Prettier 1.7.0
Playground link

--parser typescript
--single-quote
--tab-width 4
--use-tabs

Input:

function test(abc: Map<symbol, string>) {}

Output:

Error: unknown type: undefined

Expected behaviour:
Things should lint correctly - So apparently, symbol is not a valid type, but TypeScript doesn't seem to complain. Symbol fixes the issue.

[ikatyang]

Thanks for the report. I've opened eslint/typescript-eslint-parser#385 to fix this in our dependency.

As a temporary workaround you can put // prettier-ignore on the previous line.

+// prettier-ignore
function test(abc: Map<symbol, string>) {}

[maraisr]

Thanks for that @ikatyang - can't wait :)