chore: extract and refactor document type

test/types/document.test.ts

@@ -1,5 +1,5 @@
 import { Schema, model, Model, Document, Error, Types } from 'mongoose';
-import { expectError } from 'tsd';
+import { expectError, expectType } from 'tsd';
 
 const schema: Schema = new Schema({ name: { type: 'String', required: true }, address: new Schema({ city: { type: String, required: true } }) });
 
@@ -14,8 +14,15 @@ const Test = model<ITest>('Test', schema);
 void async function main() {
   const doc: ITest = await Test.findOne().orFail();
 
-  const p: Promise<ITest> = doc.remove();
-  await p;
+  expectType<Promise<ITest>>(doc.remove());
+  expectType<void>(doc.remove({}, (err, doc) => {
+    expectType<Error | null>(err);
+    expectType<any>(doc);
+  }));
+  expectType<void>(doc.remove((err, doc) => {
+    expectType<Error | null>(err);
+    expectType<any>(doc);
+  }));
 }();
 
 
@@ -33,6 +40,17 @@ void async function run() {
   test.validate({ pathsToSkip: 'name age' });
   test.validateSync({ pathsToSkip: ['name', 'age'] });
   test.validateSync({ pathsToSkip: 'name age' });
+  test.validateSync({ pathsToSkip: 'name age', blub: 1 });
+  expectType<Promise<ITest & { _id: any; }>>(test.save());
+  expectType<Promise<ITest & { _id: any; }>>(test.save({}));
+  expectType<void>(test.save({}, (err, doc) => {
+    expectType<Error | null>(err);
+    expectType<ITest & { _id: any; }>(doc);
+  }));
+  expectType<void>(test.save((err, doc) => {
+    expectType<Error | null>(err);
+    expectType<ITest & { _id: any; }>(doc);
+  }));
 })();
 
 function gh10526<U extends ITest>(arg1: Model<U>) {
@@ -58,7 +76,7 @@ function testMethods(): void {
   const UserModel = model<IUser, User>('User', schema);
 
   const doc = new UserModel({ first: 'test', last: 'test' });
-  doc.fullName().toUpperCase();
+  expectType<string>(doc.fullName());
 }
 
 function testRequiredId(): void {
@@ -114,7 +132,7 @@ async function gh11117(): Promise<void> {
     }
   ]);
   const json = items[0].toJSON();
-  const someDate: Date = json.someDate;
+  expectType<Date>(json.someDate);
 }
 
 function gh11085(): void {

types/document.d.ts

@@ -0,0 +1,244 @@
+import mongodb = require('mongodb');
+
+declare module 'mongoose' {
+
+  /** A list of paths to skip. If set, Mongoose will validate every modified path that is not in this list. */
+  type pathsToSkip = string[] | string;
+
+  class Document<T = any, TQueryHelpers = any, DocType = any> {
+    constructor(doc?: any);
+
+    /** This documents _id. */
+    _id?: T;
+
+    /** This documents __v. */
+    __v?: any;
+
+    /* Get all subdocs (by bfs) */
+    $getAllSubdocs(): Document[];
+
+    /** Don't run validation on this path or persist changes to this path. */
+    $ignore(path: string): void;
+
+    /** Checks if a path is set to its default. */
+    $isDefault(path: string): boolean;
+
+    /** Getter/setter, determines whether the document was removed or not. */
+    $isDeleted(val?: boolean): boolean;
+
+    /** Returns an array of all populated documents associated with the query */
+    $getPopulatedDocs(): Document[];
+
+    /**
+     * Returns true if the given path is nullish or only contains empty objects.
+     * Useful for determining whether this subdoc will get stripped out by the
+     * [minimize option](/docs/guide.html#minimize).
+     */
+    $isEmpty(path: string): boolean;
+
+    /** Checks if a path is invalid */
+    $isValid(path: string): boolean;
+
+    /**
+     * Empty object that you can use for storing properties on the document. This
+     * is handy for passing data to middleware without conflicting with Mongoose
+     * internals.
+     */
+    $locals: Record<string, unknown>;
+
+    /** Marks a path as valid, removing existing validation errors. */
+    $markValid(path: string): void;
+
+    /**
+     * A string containing the current operation that Mongoose is executing
+     * on this document. Can be `null`, `'save'`, `'validate'`, or `'remove'`.
+     */
+    $op: 'save' | 'validate' | 'remove' | null;
+
+    /**
+     * Getter/setter around the session associated with this document. Used to
+     * automatically set `session` if you `save()` a doc that you got from a
+     * query with an associated session.
+     */
+    $session(session?: mongodb.ClientSession | null): mongodb.ClientSession | null;
+
+    /** Alias for `set()`, used internally to avoid conflicts */
+    $set(path: string, val: any, type: any, options?: any): this;
+    $set(path: string, val: any, options?: any): this;
+    $set(value: any): this;
+
+    /** Set this property to add additional query filters when Mongoose saves this document and `isNew` is false. */
+    $where: Record<string, unknown>;
+
+    /** If this is a discriminator model, `baseModelName` is the name of the base model. */
+    baseModelName?: string;
+
+    /** Collection the model uses. */
+    collection: Collection;
+
+    /** Connection the model uses. */
+    db: Connection;
+
+    /** Removes this document from the db. */
+    delete(options: QueryOptions, callback: Callback): void;
+    delete(callback: Callback): void;
+    delete(options?: QueryOptions): QueryWithHelpers<any, this, TQueryHelpers>;
+
+    /** Removes this document from the db. */
+    deleteOne(options: QueryOptions, callback: Callback): void;
+    deleteOne(callback: Callback): void;
+    deleteOne(options?: QueryOptions): QueryWithHelpers<any, this, TQueryHelpers>;
+
+    /**
+     * Takes a populated field and returns it to its unpopulated state. If called with
+     * no arguments, then all populated fields are returned to their unpopulated state.
+     */
+    depopulate(path?: string | string[]): this;
+
+    /**
+     * Returns the list of paths that have been directly modified. A direct
+     * modified path is a path that you explicitly set, whether via `doc.foo = 'bar'`,
+     * `Object.assign(doc, { foo: 'bar' })`, or `doc.set('foo', 'bar')`.
+     */
+    directModifiedPaths(): Array<string>;
+
+    /**
+     * Returns true if this document is equal to another document.
+     *
+     * Documents are considered equal when they have matching `_id`s, unless neither
+     * document has an `_id`, in which case this function falls back to using
+     * `deepEqual()`.
+     */
+    equals(doc: Document<T>): boolean;
+
+    /** Returns the current validation errors. */
+    errors?: Error.ValidationError;
+
+    /** Returns the value of a path. */
+    get(path: string, type?: any, options?: any): any;
+
+    /**
+     * Returns the changes that happened to the document
+     * in the format that will be sent to MongoDB.
+     */
+    getChanges(): UpdateQuery<this>;
+
+    /** The string version of this documents _id. */
+    id?: any;
+
+    /** Signal that we desire an increment of this documents version. */
+    increment(): this;
+
+    /**
+    * Initializes the document without setters or marking anything modified.
+    * Called internally after a document is returned from mongodb. Normally,
+    * you do **not** need to call this function on your own.
+    */
+    init(obj: AnyObject, opts?: AnyObject, callback?: Callback<this>): this;
+
+    /** Marks a path as invalid, causing validation to fail. */
+    invalidate(path: string, errorMsg: string | NativeError, value?: any, kind?: string): NativeError | null;
+
+    /** Returns true if `path` was directly set and modified, else false. */
+    isDirectModified(path: string): boolean;
+
+    /** Checks if `path` was explicitly selected. If no projection, always returns true. */
+    isDirectSelected(path: string): boolean;
+
+    /** Checks if `path` is in the `init` state, that is, it was set by `Document#init()` and not modified since. */
+    isInit(path: string): boolean;
+
+    /**
+     * Returns true if any of the given paths are modified, else false. If no arguments, returns `true` if any path
+     * in this document is modified.
+     */
+    isModified(path?: string | Array<string>): boolean;
+
+    /** Boolean flag specifying if the document is new. */
+    isNew: boolean;
+
+    /** Checks if `path` was selected in the source query which initialized this document. */
+    isSelected(path: string): boolean;
+
+    /** Marks the path as having pending changes to write to the db. */
+    markModified(path: string, scope?: any): void;
+
+    /** Returns the list of paths that have been modified. */
+    modifiedPaths(options?: { includeChildren?: boolean }): Array<string>;
+
+    /** The name of the model */
+    modelName: string;
+
+    /**
+     * Overwrite all values in this document with the values of `obj`, except
+     * for immutable properties. Behaves similarly to `set()`, except for it
+     * unsets all properties that aren't in `obj`.
+     */
+    overwrite(obj: AnyObject): this;
+
+    /**
+     * If this document is a subdocument or populated document, returns the
+     * document's parent. Returns undefined otherwise.
+     */
+    $parent(): Document | undefined;
+
+    /** Populates document references. */
+    populate<Paths = {}>(path: string | PopulateOptions | (string | PopulateOptions)[], callback: Callback<this & Paths>): void;
+    populate<Paths = {}>(path: string, names: string, callback: Callback<this & Paths>): void;
+    populate<Paths = {}>(path: string, names: string): Promise<this & Paths>;
+    populate<Paths = {}>(path: string | PopulateOptions | (string | PopulateOptions)[]): Promise<this & Paths>;
+
+    /** Gets _id(s) used during population of the given `path`. If the path was not populated, returns `undefined`. */
+    populated(path: string): any;
+
+    /** Removes this document from the db. */
+    remove(options: QueryOptions, callback: Callback): void;
+    remove(callback: Callback): void;
+    remove(options?: QueryOptions): Promise<this>;
+
+    /** Sends a replaceOne command with this document `_id` as the query selector. */
+    replaceOne(replacement?: AnyObject, options?: QueryOptions | null, callback?: Callback): Query<any, this>;
+
+    /** Saves this document by inserting a new document into the database if [document.isNew](/docs/api.html#document_Document-isNew) is `true`, or sends an [updateOne](/docs/api.html#document_Document-updateOne) operation with just the modified paths if `isNew` is `false`. */
+    save(options: SaveOptions, callback: Callback<this>): void;
+    save(callback: Callback<this>): void;
+    save(options?: SaveOptions): Promise<this>;
+
+    /** The document's schema. */
+    schema: Schema;
+
+    /** Sets the value of a path, or many paths. */
+    set(path: string, val: any, type: any, options?: any): this;
+    set(path: string, val: any, options?: any): this;
+    set(value: any): this;
+
+    /** The return value of this method is used in calls to JSON.stringify(doc). */
+    toJSON(options: ToObjectOptions & { flattenMaps: false }): LeanDocument<this>;
+    toJSON(options?: ToObjectOptions): FlattenMaps<LeanDocument<this>>;
+    toJSON<T = FlattenMaps<DocType>>(options?: ToObjectOptions): T;
+
+    /** Converts this document into a plain-old JavaScript object ([POJO](https://masteringjs.io/tutorials/fundamentals/pojo)). */
+    toObject(options?: ToObjectOptions): LeanDocument<this>;
+    toObject<T = DocType>(options?: ToObjectOptions): T;
+
+    /** Clears the modified state on the specified path. */
+    unmarkModified(path: string): void;
+
+    /** Sends an update command with this document `_id` as the query selector. */
+    update(update?: UpdateQuery<this> | UpdateWithAggregationPipeline, options?: QueryOptions | null, callback?: Callback): Query<any, this>;
+
+    /** Sends an updateOne command with this document `_id` as the query selector. */
+    updateOne(update?: UpdateQuery<this> | UpdateWithAggregationPipeline, options?: QueryOptions | null, callback?: Callback): Query<any, this>;
+
+    /** Executes registered validation rules for this document. */
+    validate(pathsToValidate: pathsToValidate, options: AnyObject, callback: CallbackWithoutResult): void;
+    validate(pathsToValidate: pathsToValidate, callback: CallbackWithoutResult): void;
+    validate(callback: CallbackWithoutResult): void;
+    validate(pathsToValidate?: pathsToValidate, options?: AnyObject): Promise<void>;
+    validate(options: { pathsToSkip?: pathsToSkip }): Promise<void>;
+
+    /** Executes registered validation rules (skipping asynchronous validators) for this document. */
+    validateSync(options: { pathsToSkip?: pathsToSkip, [k: string]: any }): Error.ValidationError | null;
+    validateSync(pathsToValidate?: Array<string>, options?: AnyObject): Error.ValidationError | null;
+  }
+}