feat: split SimpleFaker class from Faker (#2369)

docs/.vitepress/api-pages.ts

@@ -3,6 +3,7 @@
 export const apiPages = [
   { text: 'Overview', link: '/api/' },
   { text: 'Faker', link: '/api/faker.html' },
+  { text: 'SimpleFaker', link: '/api/simpleFaker.html' },
   { text: 'Airline', link: '/api/airline.html' },
   { text: 'Animal', link: '/api/animal.html' },
   { text: 'Color', link: '/api/color.html' },

docs/guide/usage.md

@@ -127,6 +127,21 @@ or alternatively you can set a default reference date for all these methods:
 faker.setDefaultRefDate('2023-01-01T00:00:00.000Z');
 ```
 
+## Simple data generation
+
+Faker provides a `simpleFaker` that can be used to generate data that are not based on any locales like numbers and strings.  
+Also **helpers** like `arrayElement` or `multiple` are available.
+
+This is useful if you just want to generate e.g. `uuid`s for your test environment, but don't want/need to initiate/load a full Faker instance, which would include at least 500KB of locale data.
+
+```ts
+import { simpleFaker } from '@faker-js/faker';
+
+const uuid = simpleFaker.string.uuid();
+```
+
+See more about `SimpleFaker` in the [API docs](/api/simpleFaker).
+
 ## Create complex objects
 
 Faker mostly generates values for primitives.

scripts/apidoc/fakerClass.ts

@@ -4,36 +4,48 @@ import type { Method } from '../../docs/.vitepress/components/api-docs/method';
 import { writeApiDocsModule } from './apiDocsWriter';
 import { analyzeModule, processModuleMethods } from './moduleMethods';
 import { analyzeSignature } from './signature';
-import { selectApiSignature } from './typedoc';
+import { extractModuleFieldName, selectApiSignature } from './typedoc';
 import type { ModuleSummary } from './utils';
 
-export async function processFakerClass(
+export async function processFakerClasses(
   project: ProjectReflection
-): Promise<ModuleSummary> {
-  const fakerClass = project
+): Promise<ModuleSummary[]> {
+  const fakerClasses = project
     .getChildrenByKind(ReflectionKind.Class)
-    .filter((clazz) => clazz.name === 'Faker')[0];
+    .filter((clazz) => clazz.name === 'Faker' || clazz.name === 'SimpleFaker');
 
-  if (!fakerClass) {
-    throw new Error('Faker class not found');
+  if (fakerClasses.length !== 2) {
+    throw new Error('Faker classes not found');
   }
 
-  return processClass(fakerClass);
+  return Promise.all(fakerClasses.map(processClass));
 }
 
 async function processClass(
   fakerClass: DeclarationReflection
 ): Promise<ModuleSummary> {
-  console.log(`Processing Faker class`);
+  const { name } = fakerClass;
+  const moduleFieldName = extractModuleFieldName(fakerClass);
+
+  console.log(`Processing ${name} class`);
+
   const { comment, deprecated } = analyzeModule(fakerClass);
   const methods: Method[] = [];
 
   console.debug(`- constructor`);
   methods.push(await processConstructor(fakerClass));
 
-  methods.push(...(await processModuleMethods(fakerClass, 'faker.')));
+  methods.push(
+    ...(await processModuleMethods(fakerClass, `${moduleFieldName}.`))
+  );
 
-  return writeApiDocsModule('Faker', 'faker', comment, deprecated, methods);
+  return writeApiDocsModule(
+    name,
+    moduleFieldName,
+    comment,
+    deprecated,
+    methods
+  );
 }
 
 async function processConstructor(
@@ -45,7 +57,11 @@ async function processConstructor(
 
   const signature = selectApiSignature(constructor);
 
-  const method = await analyzeSignature(signature, '', 'new Faker');
+  const method = await analyzeSignature(
+    signature,
+    '',
+    `new ${fakerClass.name}`
+  );
 
   return {
     ...method,

scripts/apidoc/generate.ts

@@ -5,7 +5,7 @@ import {
   writeApiSearchIndex,
   writeSourceBaseUrl,
 } from './apiDocsWriter';
-import { processFakerClass } from './fakerClass';
+import { processFakerClasses } from './fakerClass';
 import { processFakerUtilities } from './fakerUtilities';
 import { processModules } from './moduleMethods';
 import { loadProject } from './typedoc';
@@ -23,7 +23,7 @@ export async function generate(): Promise<void> {
   await app.generateJson(project, pathOutputJson);
 
   const pages = await Promise.all([
-    processFakerClass(project),
+    ...(await processFakerClasses(project)),
     ...(await processModules(project)).sort((a, b) =>
       a.text.localeCompare(b.text)
     ),

src/faker.ts

@@ -1,8 +1,6 @@
 import type { LocaleDefinition, MetadataDefinition } from './definitions';
 import { FakerError } from './errors/faker-error';
 import { deprecated } from './internal/deprecated';
-import type { Mersenne } from './internal/mersenne/mersenne';
-import mersenne from './internal/mersenne/mersenne';
 import type { LocaleProxy } from './locale-proxy';
 import { createLocaleProxy } from './locale-proxy';
 import { AirlineModule } from './modules/airline';
@@ -11,7 +9,6 @@ import { ColorModule } from './modules/color';
 import { CommerceModule } from './modules/commerce';
 import { CompanyModule } from './modules/company';
 import { DatabaseModule } from './modules/database';
-import { DatatypeModule } from './modules/datatype';
 import { DateModule } from './modules/date';
 import { FinanceModule } from './modules/finance';
 import { GitModule } from './modules/git';
@@ -23,16 +20,15 @@ import type { LocationModule as AddressModule } from './modules/location';
 import { LocationModule } from './modules/location';
 import { LoremModule } from './modules/lorem';
 import { MusicModule } from './modules/music';
-import { NumberModule } from './modules/number';
 import type { PersonModule as NameModule } from './modules/person';
 import { PersonModule } from './modules/person';
 import { PhoneModule } from './modules/phone';
 import { RandomModule } from './modules/random';
 import { ScienceModule } from './modules/science';
-import { StringModule } from './modules/string';
 import { SystemModule } from './modules/system';
 import { VehicleModule } from './modules/vehicle';
 import { WordModule } from './modules/word';
+import { SimpleFaker } from './simple-faker';
 import { mergeLocales } from './utils/merge-locales';
 
 /**
@@ -60,72 +56,16 @@ import { mergeLocales } from './utils/merge-locales';
  *
  * customFaker.music.genre(); // throws Error as this data is not available in `es`
  */
-export class Faker {
+export class Faker extends SimpleFaker {
   readonly rawDefinitions: LocaleDefinition;
   readonly definitions: LocaleProxy;
-  private _defaultRefDate: () => Date = () => new Date();
-
-  /**
-   * Gets a new reference date used to generate relative dates.
-   */
-  get defaultRefDate(): () => Date {
-    return this._defaultRefDate;
-  }
-
-  /**
-   * Sets the `refDate` source to use if no `refDate` date is passed to the date methods.
-   *
-   * @param dateOrSource The function or the static value used to generate the `refDate` date instance.
-   * The function must return a new valid `Date` instance for every call.
-   * Defaults to `() => new Date()`.
-   *
-   * @see [Reproducible Results](https://fakerjs.dev/guide/usage.html#reproducible-results)
-   * @see faker.seed() for reproducible results.
-   *
-   * @example
-   * faker.seed(1234);
-   *
-   * // Default behavior
-   * // faker.setDefaultRefDate();
-   * faker.date.past(); // Changes based on the current date/time
-   *
-   * // Use a static ref date
-   * faker.setDefaultRefDate(new Date('2020-01-01'));
-   * faker.date.past(); // Reproducible '2019-07-03T08:27:58.118Z'
-   *
-   * // Use a ref date that changes every time it is used
-   * let clock = new Date("2020-01-01").getTime();
-   * faker.setDefaultRefDate(() => {
-   *   clock += 1000; // +1s
-   *   return new Date(clock);
-   * });
-   *
-   * faker.defaultRefDate() // 2020-01-01T00:00:01Z
-   * faker.defaultRefDate() // 2020-01-01T00:00:02Z
-   */
-  setDefaultRefDate(
-    dateOrSource: string | Date | number | (() => Date) = () => new Date()
-  ): void {
-    if (typeof dateOrSource === 'function') {
-      this._defaultRefDate = dateOrSource;
-    } else {
-      this._defaultRefDate = () => new Date(dateOrSource);
-    }
-  }
-
-  /** @internal */
-  private readonly _mersenne: Mersenne = mersenne();
 
   /**
    * @deprecated Use the modules specific to the type of data you want to generate instead.
    */
   // eslint-disable-next-line deprecation/deprecation
   readonly random: RandomModule = new RandomModule(this);
 
-  readonly helpers: HelpersModule = new HelpersModule(this);
-
-  readonly datatype: DatatypeModule = new DatatypeModule(this);
-
   readonly airline: AirlineModule = new AirlineModule(this);
   readonly animal: AnimalModule = new AnimalModule(this);
   readonly color: ColorModule = new ColorModule(this);
@@ -136,16 +76,15 @@ export class Faker {
   readonly finance = new FinanceModule(this);
   readonly git: GitModule = new GitModule(this);
   readonly hacker: HackerModule = new HackerModule(this);
+  readonly helpers: HelpersModule = new HelpersModule(this);
   readonly image: ImageModule = new ImageModule(this);
   readonly internet: InternetModule = new InternetModule(this);
   readonly location: LocationModule = new LocationModule(this);
   readonly lorem: LoremModule = new LoremModule(this);
   readonly music: MusicModule = new MusicModule(this);
   readonly person: PersonModule = new PersonModule(this);
-  readonly number: NumberModule = new NumberModule(this);
   readonly phone: PhoneModule = new PhoneModule(this);
   readonly science: ScienceModule = new ScienceModule(this);
-  readonly string: StringModule = new StringModule(this);
   readonly system: SystemModule = new SystemModule(this);
   readonly vehicle: VehicleModule = new VehicleModule(this);
   readonly word: WordModule = new WordModule(this);
@@ -299,9 +238,12 @@ export class Faker {
           localeFallback?: string;
         }
   ) {
+    super();
+
     const { locales } = options as {
       locales: Record<string, LocaleDefinition>;
     };
+
     if (locales != null) {
       deprecated({
         deprecated:
@@ -336,128 +278,6 @@ export class Faker {
     this.definitions = createLocaleProxy(this.rawDefinitions);
   }
 
-  /**
-   * Sets the seed or generates a new one.
-   *
-   * Please note that generated values are dependent on both the seed and the
-   * number of calls that have been made since it was set.
-   *
-   * This method is intended to allow for consistent values in tests, so you
-   * might want to use hardcoded values as the seed.
-   *
-   * In addition to that it can be used for creating truly random tests
-   * (by passing no arguments), that still can be reproduced if needed,
-   * by logging the result and explicitly setting it if needed.
-   *
-   * @param seed The seed to use. Defaults to a random number.
-   *
-   * @returns The seed that was set.
-   *
-   * @see [Reproducible Results](https://fakerjs.dev/guide/usage.html#reproducible-results)
-   * @see faker.setDefaultRefDate() when generating relative dates.
-   *
-   * @example
-   * // Consistent values for tests:
-   * faker.seed(42)
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * faker.seed(42)
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * // Random but reproducible tests:
-   * // Simply log the seed, and if you need to reproduce it, insert the seed here
-   * console.log('Running test with seed:', faker.seed());
-   */
-  seed(seed?: number): number;
-  /**
-   * Sets the seed array.
-   *
-   * Please note that generated values are dependent on both the seed and the
-   * number of calls that have been made since it was set.
-   *
-   * This method is intended to allow for consistent values in a tests, so you
-   * might want to use hardcoded values as the seed.
-   *
-   * In addition to that it can be used for creating truly random tests
-   * (by passing no arguments), that still can be reproduced if needed,
-   * by logging the result and explicitly setting it if needed.
-   *
-   * @param seedArray The seed array to use.
-   *
-   * @returns The seed array that was set.
-   *
-   * @see [Reproducible Results](https://fakerjs.dev/guide/usage.html#reproducible-results)
-   * @see faker.setDefaultRefDate() when generating relative dates.
-   *
-   * @example
-   * // Consistent values for tests:
-   * faker.seed([42, 13, 17])
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * faker.seed([42, 13, 17])
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * // Random but reproducible tests:
-   * // Simply log the seed, and if you need to reproduce it, insert the seed here
-   * console.log('Running test with seed:', faker.seed());
-   */
-  seed(seedArray: number[]): number[];
-  /**
-   * Sets the seed or generates a new one.
-   *
-   * Please note that generated values are dependent on both the seed and the
-   * number of calls that have been made since it was set.
-   *
-   * This method is intended to allow for consistent values in a tests, so you
-   * might want to use hardcoded values as the seed.
-   *
-   * In addition to that it can be used for creating truly random tests
-   * (by passing no arguments), that still can be reproduced if needed,
-   * by logging the result and explicitly setting it if needed.
-   *
-   * @param seed The seed or seed array to use.
-   *
-   * @returns The seed that was set.
-   *
-   * @see [Reproducible Results](https://fakerjs.dev/guide/usage.html#reproducible-results)
-   * @see faker.setDefaultRefDate() when generating relative dates.
-   *
-   * @example
-   * // Consistent values for tests (using a number):
-   * faker.seed(42)
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * faker.seed(42)
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * // Consistent values for tests (using an array):
-   * faker.seed([42, 13, 17])
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * faker.seed([42, 13, 17])
-   * faker.number.int(10); // 4
-   * faker.number.int(10); // 8
-   *
-   * // Random but reproducible tests:
-   * // Simply log the seed, and if you need to reproduce it, insert the seed here
-   * console.log('Running test with seed:', faker.seed());
-   */
-  seed(seed?: number | number[]): number | number[];
-  seed(
-    seed: number | number[] = Math.ceil(Math.random() * Number.MAX_SAFE_INTEGER)
-  ): number | number[] {
-    this._mersenne.seed(seed);
-
-    return seed;
-  }
-
   /**
    * Returns an object with metadata about the current locale.
    *