Apollo-tooling: Typescript schema types: Semicolons after interfaces cause errors

[ChrisGitter]

Using apollo-codegen 0.18.8 and typescript 2.7.2, I get the following error from Typescript:

[ts] Statements are not allowed in ambient contexts.

The error is caused by the semicolon inserted after the interfaces in the schema.d.ts file, for example:
export interface InterfaceName { ... };

Is there any CLI option to avoid the generation of semicolons?

[daggerjames]

+1 manually deleting semicolon kills me.

[TiuSh]

Same here, with Typescript 2.6.2.

@lewisf Could we just remove the generator.print(';'); from here ? That should fix this issue, but I don't know the exact impact on previous typescript version.

[lewisf]

@TiuSh I don't use Typescript on my day to day graphql repo. Can someone confirm that this is okay?

[TiuSh]

@lewisf After a little digging, it seams that Typescript interfaces should not be followed by semicolon (see https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md for more examples). I created a PR with the given fix and updated tests.

[zhenwenc]

A funny workaround, I run prettier on the generated file to remove the semicolon ...

[shadaj]

With the new TypeScript target in the Apollo CLI, semicolons are no longer added after interfaces!