Export core API typings in a namespace & use ES modules

Using ES modules (import/export everywhere) prevents from polluting the
global namespace with values and types, which is a best practice for a
GAS library.

Using a namespace for the core API typings allows for a better DX when
using the library in other GAS projects.

Use it like this:

1. Install the library just for grabbing its types locally:

        npm -i -D firestore_google-apps-script # once/if published to npmjs.com
        # or
        npm -i -D grahamearley/FirestoreGoogleAppsScript # in the meantime

2. In a .d.ts file of your making that’s included in tsconfig.json, add:

        import { FirestoreGoogleAppsScript } from "firestore_google-apps-script/typings";

        declare const FirestoreDataSource: FirestoreGoogleAppsScript.FirestoreApp; // globally available
        // or
        declare global { const FirestoreDataSource: FirestoreGoogleAppsScript.FirestoreApp; } // globally available
        // or
        export const FirestoreDataSource: FirestoreGoogleAppsScript.FirestoreApp; // you’ll have to import it in files

Note: although you don’t need to, it may clarify your intent adding:

        /// <reference types="../node_modules/firestore_google-apps-script/typings/index.d.ts" />

Note: you may rename `FirestoreDataSource`, it’s just a _Clean Architecture_
naming convention I’m following, which maps the `userSymbol` I dediced to use
in appsscript.json. If you are manually enabling the lib through the Google
Apps Script UI, it will actually be be called `FirestoreApp` by default,
which does not conflict with the one that’s namespaced.

Author: chikamichi

Auth.ts

@@ -1,3 +1,6 @@
+import Request from './Request';
+import Util_ from './Util';
+
 /**
  * Auth token is formatted to {@link https://developers.google.com/identity/protocols/oauth2/service-account#authorizingrequests}
  *
@@ -7,7 +10,7 @@
  * @param authUrl the authorization url
  * @returns {string} the access token needed for making future requests
  */
-class Auth {
+export default class Auth {
   email: string;
   key: string;
   authUrl: string;

Document.ts

@@ -1,7 +1,11 @@
+import FirestoreAPI = gapi.client.firestore;
+import { FirestoreGoogleAppsScript as T } from './typings';
+import Util_ from './Util';
+
 /**
  * Firestore Document
  */
-class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
+export default class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
   fields?: Record<string, FirestoreAPI.Value>;
   createTime?: string;
   updateTime?: string;
@@ -14,13 +18,13 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
    * @param obj
    * @param name
    */
-  constructor(obj: Value | FirestoreAPI.Document, name?: string | Document | FirestoreAPI.ReadOnly) {
+  constructor(obj: T.Value | FirestoreAPI.Document, name?: string | Document | FirestoreAPI.ReadOnly) {
     //Treat parameters as existing Document with extra parameters to merge in
     if (typeof name === 'object') {
       Object.assign(this, obj);
       Object.assign(this, name);
     } else {
-      this.fields = Document.wrapMap(obj as ValueObject).fields;
+      this.fields = Document.wrapMap(obj as T.ValueObject).fields;
       if (name) {
         this.name = name;
       }
@@ -49,15 +53,15 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
    * @param {object} firestoreDoc the Firestore document whose fields will be extracted
    * @return {object} an object with the given document's fields and values
    */
-  get obj(): Record<string, Value> {
+  get obj(): Record<string, T.Value> {
     return Document.unwrapObject(this);
   }
 
   toString(): string {
     return `Document (${Util_.getDocumentFromPath(this.name as string)[1]})`;
   }
 
-  static unwrapValue(obj: FirestoreAPI.Value): Value {
+  static unwrapValue(obj: FirestoreAPI.Value): T.Value {
     // eslint-disable-next-line prefer-const
     let [type, val]: [string, any] = Object.entries(obj)[0];
     switch (type) {
@@ -83,17 +87,17 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
     }
   }
 
-  static unwrapObject(obj: FirestoreAPI.MapValue): ValueObject {
+  static unwrapObject(obj: FirestoreAPI.MapValue): T.ValueObject {
     return Object.entries(obj.fields || {}).reduce(
-      (o: Record<string, Value>, [key, val]: [string, FirestoreAPI.Value]) => {
+      (o: Record<string, T.Value>, [key, val]: [string, FirestoreAPI.Value]) => {
         o[key] = Document.unwrapValue(val);
         return o;
       },
       {}
     );
   }
 
-  static unwrapArray(wrappedArray: FirestoreAPI.Value[] = []): Value[] {
+  static unwrapArray(wrappedArray: FirestoreAPI.Value[] = []): T.Value[] {
     return wrappedArray.map(this.unwrapValue, this);
   }
 
@@ -102,13 +106,13 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
     return new Date(wrappedDate.replace(Util_.regexDatePrecision, '$1'));
   }
 
-  static wrapValue(val: Value): FirestoreAPI.Value {
+  static wrapValue(val: T.Value): FirestoreAPI.Value {
     const type = typeof val;
     switch (type) {
       case 'string':
         return this.wrapString(val as string);
       case 'object':
-        return this.wrapObject(val as ValueObject);
+        return this.wrapObject(val as T.ValueObject);
       case 'number':
         return this.wrapNumber(val as number);
       case 'boolean':
@@ -132,7 +136,7 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
     return { stringValue: string };
   }
 
-  static wrapObject(obj: ValueObject): FirestoreAPI.Value {
+  static wrapObject(obj: T.ValueObject): FirestoreAPI.Value {
     if (!obj) {
       return this.wrapNull();
     }
@@ -154,9 +158,9 @@ class Document implements FirestoreAPI.Document, FirestoreAPI.MapValue {
     return { mapValue: this.wrapMap(obj) };
   }
 
-  static wrapMap(obj: ValueObject): FirestoreAPI.MapValue {
+  static wrapMap(obj: T.ValueObject): FirestoreAPI.MapValue {
     return {
-      fields: Object.entries(obj).reduce((o: Record<string, FirestoreAPI.Value>, [key, val]: [string, Value]) => {
+      fields: Object.entries(obj).reduce((o: Record<string, FirestoreAPI.Value>, [key, val]: [string, T.Value]) => {
         o[key] = Document.wrapValue(val);
         return o;
       }, {}),

Firestore.ts

@@ -1,9 +1,18 @@
+import FirestoreAPI = gapi.client.firestore;
+import FirestoreRead from './FirestoreRead';
+import FirestoreWrite from './FirestoreWrite';
+import FirestoreDelete from './FirestoreDelete';
+import Document from './Document';
+import Query from './Query';
+import Auth from './Auth';
+import Request from './Request';
+
 /* eslint @typescript-eslint/no-unused-vars: ["error", { "varsIgnorePattern": "^getFirestore$" }] */
 
 /**
  * An authenticated interface to a Firestore project.
  */
-class Firestore implements FirestoreRead, FirestoreWrite, FirestoreDelete {
+export default class Firestore implements FirestoreRead, FirestoreWrite, FirestoreDelete {
   auth: Auth;
   basePath: string;
   baseUrl: string;
@@ -133,7 +142,7 @@ class Firestore implements FirestoreRead, FirestoreWrite, FirestoreDelete {
   query_ = FirestoreRead.prototype.query_;
 }
 
-type Version = 'v1' | 'v1beta1' | 'v1beta2';
+export type Version = 'v1' | 'v1beta1' | 'v1beta2';
 
 /**
  * Get an object that acts as an authenticated interface with a Firestore project.
@@ -144,6 +153,6 @@ type Version = 'v1' | 'v1beta1' | 'v1beta2';
  * @param {string} apiVersion [Optional] The Firestore API Version ("v1beta1", "v1beta2", or "v1")
  * @return {Firestore} an authenticated interface with a Firestore project (function)
  */
-function getFirestore(email: string, key: string, projectId: string, apiVersion: Version = 'v1'): Firestore {
+export function getFirestore(email: string, key: string, projectId: string, apiVersion: Version = 'v1'): Firestore {
   return new Firestore(email, key, projectId, apiVersion);
 }

FirestoreDelete.ts

@@ -1,7 +1,10 @@
+import FirestoreAPI = gapi.client.firestore;
+import Request from './Request';
+
 /**
  * Extends Firestore class with private method
  */
-class FirestoreDelete {
+export default class FirestoreDelete {
   /**
    * Delete the Firestore document at the given path.
    * Note: this deletes ONLY this document, and not any subcollections.

FirestoreRead.ts

@@ -1,7 +1,13 @@
+import FirestoreAPI = gapi.client.firestore;
+import Document from './Document';
+import Request from './Request';
+import Query from './Query';
+import Util_ from './Util';
+
 /**
  * Extends Firestore class with private method
  */
-class FirestoreRead {
+export default class FirestoreRead {
   /**
    * Get the Firestore document or collection at a given path.
    * If the collection contains enough IDs to return a paginated result, this method only returns the first page.

FirestoreWrite.ts

@@ -1,7 +1,12 @@
+import FirestoreAPI = gapi.client.firestore;
+import Document from './Document';
+import Request from './Request';
+import Util_ from './Util';
+
 /**
  * Extends Firestore class with private method
  */
-class FirestoreWrite {
+export default class FirestoreWrite {
   /**
    * Create a document with the given ID and fields.
    *

Query.ts

@@ -1,10 +1,16 @@
-interface QueryCallback {
+import FirestoreAPI = gapi.client.firestore;
+import Document from './Document';
+import Util_ from './Util';
+
+import type { FilterOp } from './typings/Query';
+
+export interface QueryCallback {
   (query: Query): Document[];
 }
 /**
  * @see {@link https://firebase.google.com/docs/firestore/reference/rest/v1/StructuredQuery#Operator_1 FieldFilter Operator}
  */
-enum FieldFilterOps_ {
+export enum FieldFilterOps_ {
   '==' = 'EQUAL',
   '===' = 'EQUAL',
   '<' = 'LESS_THAN',
@@ -18,7 +24,7 @@ enum FieldFilterOps_ {
 /**
  * @see {@link https://firebase.google.com/docs/firestore/reference/rest/v1/StructuredQuery#Operator_2 UnaryFilter Operator}
  */
-enum UnaryFilterOps_ {
+export enum UnaryFilterOps_ {
   'nan' = 'IS_NAN',
   'null' = 'IS_NULL',
 }
@@ -29,7 +35,7 @@ enum UnaryFilterOps_ {
  *
  * @see {@link https://firebase.google.com/docs/firestore/reference/rest/v1/StructuredQuery Firestore Structured Query}
  */
-class Query implements FirestoreAPI.StructuredQuery {
+export default class Query implements FirestoreAPI.StructuredQuery {
   select?: FirestoreAPI.Projection;
   from?: FirestoreAPI.CollectionSelector[];
   where?: FirestoreAPI.Filter;
@@ -104,7 +110,7 @@ class Query implements FirestoreAPI.StructuredQuery {
 
   filter_(field: string, operator: string | number | null, value: any): FirestoreAPI.Filter {
     if (typeof operator === 'string') {
-      operator = operator.toLowerCase().replace('_', '') as FilterOp;
+      operator = (operator.toLowerCase().replace('_', '') as FilterOp) as string;
     } else if (value == null) {
       // Covers null and undefined values
       operator = 'null';

Request.ts

@@ -1,8 +1,10 @@
+import Util_ from './Util';
+
 /**
  * Manages the requests to send. Chain methods to update options.
  * Must call .get/.post/.patch/.remove to send the request with given options.
  */
-class Request {
+export default class Request {
   url: string;
   authToken: string;
   queryString: string;

Tests.ts

@@ -1,3 +1,11 @@
+import { getFirestore } from './Firestore';
+import { FirestoreGoogleAppsScript } from './typings/index';
+import Util_ from './Util';
+
+import type { Version } from './Firestore';
+type Firestore = FirestoreGoogleAppsScript.Firestore;
+type Value = FirestoreGoogleAppsScript.Value;
+
 function StoreCredentials_(): void {
   /** DO NOT SAVE CREDENTIALS HERE */
   const email = 'xxx@appspot.gserviceaccount.com';
@@ -30,7 +38,7 @@ class Tests implements TestManager {
       this.pass.push('Test_Get_Firestore');
     } catch (e) {
       // On failure, fail the remaining tests without execution
-      this.fail.set('Test_Get_Firestore', e);
+      this.fail.set('Test_Get_Firestore', e as Error);
       const err = new Error('Test Initialization Error');
       err.stack = 'See Test_Get_Firestore Error';
       for (const func of funcs) {
@@ -73,7 +81,7 @@ class Tests implements TestManager {
           // eslint-disable-next-line no-ex-assign
           e = err;
         }
-        this.fail.set(func, e);
+        this.fail.set(func, e as Error);
       }
     }
   }
@@ -112,7 +120,7 @@ class Tests implements TestManager {
       this.db.createDocument(path);
       GSUnit.fail('Duplicate document without error');
     } catch (e) {
-      if (e.message !== `Document already exists: ${this.db.basePath}${path}`) {
+      if ((e as Error).message !== `Document already exists: ${this.db.basePath}${path}`) {
         throw e;
       }
     }
@@ -219,7 +227,7 @@ class Tests implements TestManager {
       this.db.getDocument(path);
       GSUnit.fail('Missing document without error');
     } catch (e) {
-      if (e.message !== `Document "${this.db.basePath}${path}" not found.`) {
+      if ((e as Error).message !== `Document "${this.db.basePath}${path}" not found.`) {
         throw e;
       }
     }

Util.ts

@@ -1,4 +1,5 @@
-class Util_ {
+import FirestoreAPI = gapi.client.firestore;
+export default class Util_ {
   /**
    * RegEx test for root path references. Groups relative path for extraction.
    */