Esm compatibility

[Zetazzz]

use restoreImportExtension in options to add ext to paths. e.g.:

restoreImportExtension: '.js'

import { Attribute, AttributeSDKType } from "../../base/v1beta2/attribute.js";

or

restoreImportExtension: '.mjs'

import { Attribute, AttributeSDKType } from "../../base/v1beta2/attribute.mjs";

All related paths have been handled.