Publish expect tslint rule independently

[OliverJAsh]

It would be useful to have the expect tslint rule published independently, so it can be used in tslint projects. palantir/tslint#2114

Would this be difficult to do, or is it just a case of moving the rule into a separate project and publishing?

[eps1lon]

As a temporary workaround you should be able to install dtslint and add

    "rules": {
        "expect": true
    },
    "rulesDirectory": [
        "./node_modules/dtslint/bin/rules"
    ]

to your tslint.json. You just have to be careful with mixing typescript versions since dtslint currently list typescript as a direct dependency.

[OliverJAsh]

Thanks @eps1lon. When running tslint, it seesm to use the version of TS installed by dtslint. Is there any way to make it use the local version at the top level of node_modules?

[eps1lon]

Thanks @eps1lon. When running tslint, it seesm to use the version of TS installed by dtslint. Is there any way to make it use the local version at the top level of node_modules?

@OliverJAsh You could use the resolutions field if you're using yarn. I don't use other package managers at the moment so I wouldn't know how to achieve something similar with npm or pnpm.

[OliverJAsh]

@eps1lon Thanks, I'm doing that but for some reason dtslint still reports the version as next, even though it's not installed anywhere in my node_modules:

TypeScript@next expected type to be:

[OliverJAsh]

Ah, it's because the string is hardcoded here.

dtslint/src/rules/expectRule.ts

Line 41 in 21cee82

walk(ctx, lintProgram, TsType, "next", /*nextHigherVersion*/ undefined));

It is using the local version, however, so all is good.

[OliverJAsh]

I created a small example project to demonstrate how you can use the TSLint expect rule, independently of dtslint: https://github.com/unsplash/ts-type-tests-example

[OliverJAsh]

We've had a lot of success with https://www.npmjs.com/package/eslint-plugin-expect-type.