fake-eggs

Providing you with all sorts of Good Eggs-style fake data!

All exported functions are stateless (meaning you don't have to worry about binding to this).

Purpose and Scope

Use fake-eggs to generate random and realistic "Good Eggs"-style data. This module can be used for test data, local development, and beyond!

Note: when generating json schemas or mongoose schemas Unionized should be used as fake-eggs does not support factory-style composition for test data objects.

If fake-eggs doesn't support the random data you're trying to generate consider opening an issue to track it - or open a PR to contribute!

Examples

import fake from 'fake-eggs';

fake.boolean(); // => true
fake.sample(['a', 'b', 'c']); // => 'b
fake.uri(); // => 'https://7wr6_.goodeggs.com/k/ok
fake.employee.email(); // => '[email protected]

API

fake.address

() => string

Generates a random street address string (e.g., 5447 Bazpe Lane). Recommended to use its fake.location.address counterpart.

fake.array

<T>(lengthLowerInclusive: number, lengthUpperExclusive: number, generator: () => T) => T[]

Calls supplied generator function to return an array of length lengthLowerInclusive and lengthUpperInclusive.

fake.boolean

() => boolean

Returns true or false, chosen at random.

fake.chance

Exposes the underlying Chance.js client.

fake.customer.firstName

() => string

Returns a randomly-selected first name, e.g. Carter.

fake.customer.lastName

() => string

Generates a random last name, e.g., Armstrong.

fake.customer.phoneNumber

() => string

Generates a random phone number, e.g. +15556797779.

fake.customer.fullName

(firstName?: string, lastName?: string) => string

Randomly generates a full name, e.g., Randall Munroe. firstName and lastName can optionally be overridden.

fake.customer.email

(options?: {domain?: string, username?: string}) => string

Returns a randomly-selected email address string (e.g., [email protected]). You can override either portion of the email with username and domain options.

fake.date

(from?: (Date | string), to?: (Date | string)) => Date

Returns a randomly-selected Date, optionally between from and to.

fake.day

(from?: (Date | string), to?: (Date | string)) => string

Returns a randomly-selected day string (YYYY-MM-DD), optionally between from and to.

fake.digit

() => number

Returns a randomly-selected digit (integer between 0 and 9).

fake.email

(options?: {domain?: string, username?: string}) => string

Returns a randomly-selected email address string (e.g., [email protected]). You can override either portion of the email with username and domain options.

fake.employee.firstName

() => string

Returns a randomly-selected first name, e.g. Carter.

fake.employee.lastName

() => string

Generates a random last name, e.g., Armstrong.

fake.employee.phoneNumber

() => string

Generates a random phone number, e.g. +15556797779.

fake.employee.fullName

(firstName?: string, lastName?: string) => string

Randomly generates a full name, e.g., Randall Munroe. firstName and lastName can optionally be overridden.

fake.employee.email

(options?: {firstName?: string, lastName?: string}) => string

Returns a randomly-selected email address at goodeggs.com of the form [email protected]. You can override firstName and lastName by providing appropriate options.

fake.firstName

() => string

Returns a randomly-selected first name, e.g. Carter.

fake.foodhub.slug

() => string

Returns a randomly-selected foodhub slug, e.g. sfbay.

fake.fullName

(firstName?: string, lastName?: string) => string

Randomly generates a full name, e.g., Randall Munroe. firstName and lastName can optionally be overridden.

fake.integer

(lowerInclusive?: number, upperExclusive?: number) => number

Generates a random integer (could be negative!). Optionally between lowerExclusive and upperExclusive.

fake.lastName

() => string

Generates a random last name, e.g., Armstrong.

fake.location.address

() => string

Generates a random street address string (e.g., 5447 Bazpe Lane).

fake.location.state

() => string

Generates a random two letter state code, e.g., CA.

fake.location.zip

Generate a random zip code (e.g. 55416) with the option of specifying a ZIP+4 format (e.g. 12201-7050)

(options?: {plusfour?: boolean}) => string

fake.maybe

<T>(returnValue: () => T) => ?T

Potentially returns null, undefined, or the result of the supplied returnValue function.

Useful for maybe types in Flow, e.g.:

{
  maybeValue: ?boolean,
}

fake.nullable

<T>(returnValue: () => T) => (T | null)

fake.number

(lowerInclusive?: number, upperExclusive?: number, fixed?: number) => number

Generates a random number, optionally between lowerInclusive and upperExclusive with a fixed number of digits after the decimal.

fake.objectId

({+counter?: number, +from?: (string | Date), +machineId?: number, +processId?: number, +timestamp?: (string | Date | number), +to?: (string | Date)}) => string

Generates a random mongodb-friendly objectId string.

fake.optional

<T>(returnValue: () => T) => (T | void)

fake.phoneNumber

() => string

Generates a random phone number, e.g. +15556797779.

fake.producer.name

() => string

Generates a random producer name, e.g., Bahringer.

fake.producer.slug

(nameArg?: string) => string

Generates a random producer slug, e.g., anderson. Optionally can override with an explicit name to generate from.

fake.product.name

() => string

Generates a random product name, e.g. Hargrand Apricots.

fake.product.unit

() => string

Generates a random product unit, e.g. count.

fake.product.count

() => number

Generates a random product count, e.g., 31.

fake.product.storageType

() => string

Generates a random storage type, e.g., chill.

fake.sample

<T>(array: T[]) => T

Chooses one of the elements of the provided array. The given array cannot be empty.

fake.sentence

() => string

Generates a random sentence beginning with a capitalized letter and ending with a period.

fake.string

(length?: number, charset?: string) => string

Generates a random string, optionally of length and using chars from provided charset.

fake.tzid

(tzids?: string[]) => string

Generate a random tzid, e.g., America/Denver.

Accepts an optional array of tzids to sample.

fake.unique

(
  generator: (...args: A) => T,
  {
    isEqual = Object.is,
  }: {
    isEqual?: (a: T, b: T) => boolean;
  } = {},
): ((...args: A) => T)

Accepts a generator function and a number of items to generate and returns an array of unique values. It throws a RangeError when it is unable to generate an array of unique values.

By default it compares each new generated value against all other generated values using a sameValueZero (Object.is) comparsion. You can customize this behavior by passing your own comparator via options.isEqual.

For example:

import fake from 'fake-eggs';

const uniqueFoo = fake.unique(fake.string);
uniqueFoo(); // => e.g. "foo_0"
uniqueFoo(); // => e.g. "foo_1"
uniqueFoo(); // => e.g. "foo_2"

// This could theoretically fail, but we'd have to get extraordinarily unlucky for it to do so.
const generateInteger0to100 = (): number => Math.floor(Math.random() * 100);
const generateUniqueInteger0to100 = fake.unique(generateInteger0to100);
const values = [1, 2, 3, 4, 5].map(() => generateUniqueInteger0to100());

fake.uri

(domain?: string) => string

Generate a random URI, e.g., https://adl2j.goodeggs.com/ax/faj23 @param {*} domain

fake.word

(length?: number, charset?: string) => string

fake.zip

Generate a random zip code (e.g. 55416) with the option of specifying a ZIP+4 format (e.g. 12201-7050). Recommended to use its fake.location.zip counterpart.

(options?: {plusfour?: boolean}) => string

Chance.js methods

fake-eggs uses chance.js behind the scenes. The chance.js object is exposed using fake.chance, if you wish to use any of its functions.

i.e.

fake.chance.address()
fake.chance.state()

Contributing

To compile the project:

yarn run build

To run tests:

yarn run test

Releasing

To release a new version of this module, use yarn to bump the version in package.json and create a git tag, then push. This will automatically get published to the NPM registry via CI.

yarn version --new-version=<major|minor|patch|premajor|preminor|prepatch>
git push --follow-tags