.eslintrc.yaml

parser: "@typescript-eslint/parser"
parserOptions:
  ecmaVersion: 7
  sourceType: module
extends:
  - eslint:recommended
  - plugin:import/errors
  - plugin:import/warnings
  - plugin:import/typescript
settings:
  import/resolver:
    typescript: {}

ERROR-LOG

$ yarn eslint index.ts
yarn run v1.21.1
warning ../package.json: No license field
$ /path/to/eslint-import-firebase/node_modules/.bin/eslint index.ts
TypeError: moduleDecl.body.body.forEach is not a function
Occurred while linting /path/to/eslint-import-firebase/index.ts:1
    at /path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/ExportMap.js:564:32
    at Array.forEach (<anonymous>)
    at /path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/ExportMap.js:562:19
    at Array.forEach (<anonymous>)
    at Function.ExportMap.parse (/path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/ExportMap.js:476:12)
    at Function.ExportMap.for (/path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/ExportMap.js:360:25)
    at Function.ExportMap.get (/path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/ExportMap.js:315:23)
    at processBodyStatement (/path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/rules/namespace.js:67:47)
    at Array.forEach (<anonymous>)
    at Program (/path/to/eslint-import-firebase/node_modules/eslint-plugin-import/lib/rules/namespace.js:96:14)
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

index.js

import * as firebase from 'firebase/app';

firebase.analytics();

package.json

{
  "name": "eslint-import-firebase",
  "version": "1.0.0",
  "devDependencies": {
    "@typescript-eslint/parser": "^2.15.0",
    "eslint": "^6.8.0",
    "eslint-import-resolver-typescript": "^2.0.0",
    "eslint-plugin-import": "^2.20.0",
    "typescript": "^3.7.4"
  },
  "dependencies": {
    "firebase": "^7.6.2"
  }
}