ESLint JSDoc is not as strict as it could be

[michaelfig]

Our use of the ESLint JSDoc plugin should support all JSDoc types known by Typescript.

However, gajus/eslint-plugin-jsdoc#637 indicates that some JSDocs will be flagged with jsdoc/valid-types, so I had to add:

/* eslint-disable jsdoc/valid-types */
...
/* eslint-enable jsdoc/valid-types */

to make some Typescript syntax pass (asserts ..., x is Foo, and others).

When that bug is resolved, we should remove the eslint disable/enables.