@feathersjs/commons/src/index.ts

// Removes all leading and trailing slashes from a path
export function stripSlashes(name: string) {
  return name.replace(/^(\/+)|(\/+)$/g, '')
}

export type KeyValueCallback<T> = (value: any, key: string) => T

// A set of lodash-y utility functions that use ES6
export const _ = {
  each(obj: any, callback: KeyValueCallback<void>) {
    if (obj && typeof obj.forEach === 'function') {
      obj.forEach(callback)
    } else if (_.isObject(obj)) {
      Object.keys(obj).forEach((key) => callback(obj[key], key))
    }
  },

  some(value: any, callback: KeyValueCallback<boolean>) {
    return Object.keys(value)
      .map((key) => [value[key], key])
      .some(([val, key]) => callback(val, key))
  },

  every(value: any, callback: KeyValueCallback<boolean>) {
    return Object.keys(value)
      .map((key) => [value[key], key])
      .every(([val, key]) => callback(val, key))
  },

  keys(obj: any) {
    return Object.keys(obj)
  },

  values(obj: any) {
    return _.keys(obj).map((key) => obj[key])
  },

  isMatch(obj: any, item: any) {
    return _.keys(item).every((key) => obj[key] === item[key])
  },

  isEmpty(obj: any) {
    return _.keys(obj).length === 0
  },

  isObject(item: any) {
    return typeof item === 'object' && !Array.isArray(item) && item !== null
  },

  isObjectOrArray(value: any) {
    return typeof value === 'object' && value !== null
  },

  extend(first: any, ...rest: any[]) {
    return Object.assign(first, ...rest)
  },

  omit(obj: any, ...keys: string[]) {
    const result = _.extend({}, obj)
    keys.forEach((key) => delete result[key])
    return result
  },

  pick(source: any, ...keys: string[]) {
    return keys.reduce((result: { [key: string]: any }, key) => {
      if (source[key] !== undefined) {
        result[key] = source[key]
      }

      return result
    }, {})
  },

  // Recursively merge the source object into the target object
  merge(target: any, source: any) {
    if (_.isObject(target) && _.isObject(source)) {
      Object.keys(source).forEach((key) => {
        if (_.isObject(source[key])) {
          if (!target[key]) {
            Object.assign(target, { [key]: {} })
          }

          _.merge(target[key], source[key])
        } else {
          Object.assign(target, { [key]: source[key] })
        }
      })
    }
    return target
  }
}

// Duck-checks if an object looks like a promise
export function isPromise(result: any) {
  return _.isObject(result) && typeof result.then === 'function'
}

export function createSymbol(name: string) {
  return typeof Symbol !== 'undefined' ? Symbol.for(name) : name
}

export * from './debug'