Support for import.meta

TypeScript 2.9 introduces support for import.meta, a new meta-property as described by the current TC39 proposal.

The type of import.meta is the global ImportMeta type which is defined in lib.es5.d.ts.This interface is extremely limited.Adding well-known properties for Node or browsers requires interface merging and possibly a global augmentation depending on the context.

Example

Assuming that __dirname is always available on import.meta, the declaration would be done through reopening ImportMeta interface:

// node.d.ts
interface ImportMeta {
    __dirname: string;
}

And usage would be:

import.meta.__dirname // Has type 'string'

import.meta is only allowed when targeting ESNext modules and ECMAScript targets.