perfomance fixes, eslint fixes (#4482)

.internal/MapCache.js

@@ -12,7 +12,7 @@ import Hash from './Hash.js'
 function getMapData({ __data__ }, key) {
   const data = __data__
   return isKeyable(key)
-    ? data[typeof key == 'string' ? 'string' : 'hash']
+    ? data[typeof key === 'string' ? 'string' : 'hash']
     : data.map
 }
 
@@ -25,7 +25,7 @@ function getMapData({ __data__ }, key) {
  */
 function isKeyable(value) {
   const type = typeof value
-  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+  return (type === 'string' || type === 'number' || type === 'symbol' || type === 'boolean')
     ? (value !== '__proto__')
     : (value === null)
 }

.internal/arrayLikeKeys.js

@@ -30,7 +30,7 @@ function arrayLikeKeys(value, inherited) {
     if ((inherited || hasOwnProperty.call(value, key)) &&
         !(skipIndexes && (
         // Safari 9 has enumerable `arguments.length` in strict mode.
-          (key == 'length' ||
+          (key === 'length' ||
            // Skip index properties.
            isIndex(key, length))
         ))) {

.internal/assignValue.js

@@ -16,7 +16,7 @@ function assignValue(object, key, value) {
   const objValue = object[key]
 
   if (!(hasOwnProperty.call(object, key) && eq(objValue, value))) {
-    if (value !== 0 || (1 / value) == (1 / objValue)) {
+    if (value !== 0 || (1 / value) === (1 / objValue)) {
       baseAssignValue(object, key, value)
     }
   } else if (value === undefined && !(key in object)) {

.internal/baseClone.js

@@ -131,7 +131,7 @@ function initCloneArray(array) {
   const result = new array.constructor(length)
 
   // Add properties assigned by `RegExp#exec`.
-  if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+  if (length && typeof array[0] === 'string' && hasOwnProperty.call(array, 'index')) {
     result.index = array.index
     result.input = array.input
   }
@@ -177,7 +177,7 @@ function baseClone(value, bitmask, customizer, key, object, stack) {
       return copyArray(value, result)
     }
   } else {
-    const isFunc = typeof value == 'function'
+    const isFunc = typeof value === 'function'
 
     if (isBuffer(value)) {
       return cloneBuffer(value, isDeep)

.internal/baseMatches.js

@@ -11,7 +11,7 @@ import matchesStrictComparable from './matchesStrictComparable.js'
  */
 function baseMatches(source) {
   const matchData = getMatchData(source)
-  if (matchData.length == 1 && matchData[0][2]) {
+  if (matchData.length === 1 && matchData[0][2]) {
     return matchesStrictComparable(matchData[0][0], matchData[0][1])
   }
   return (object) => object === source || baseIsMatch(object, source, matchData)

.internal/baseMergeDeep.js

@@ -71,7 +71,7 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       if (isArguments(objValue)) {
         newValue = toPlainObject(objValue)
       }
-      else if (typeof objValue == 'function' || !isObject(objValue)) {
+      else if (typeof objValue === 'function' || !isObject(objValue)) {
         newValue = initCloneObject(srcValue)
       }
     }

.internal/basePullAt.js

@@ -17,7 +17,7 @@ function basePullAt(array, indexes) {
   while (length--) {
     let previous
     const index = indexes[length]
-    if (length == lastIndex || index !== previous) {
+    if (length === lastIndex || index !== previous) {
       previous = index
       if (isIndex(index)) {
         array.splice(index, 1)

.internal/baseSortedIndex.js

@@ -21,7 +21,7 @@ function baseSortedIndex(array, value, retHighest) {
   let low = 0
   let high = array == null ? low : array.length
 
-  if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
+  if (typeof value === 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
     while (low < high) {
       const mid = (low + high) >>> 1
       const computed = array[mid]

.internal/baseToNumber.js

@@ -12,7 +12,7 @@ const NAN = 0 / 0
  * @returns {number} Returns the number.
  */
 function baseToNumber(value) {
-  if (typeof value == 'number') {
+  if (typeof value === 'number') {
     return value
   }
   if (isSymbol(value)) {

.internal/baseToString.js

@@ -16,7 +16,7 @@ const symbolToString = Symbol.prototype.toString
  */
 function baseToString(value) {
   // Exit early for strings to avoid a performance hit in some environments.
-  if (typeof value == 'string') {
+  if (typeof value === 'string') {
     return value
   }
   if (Array.isArray(value)) {

.internal/cloneBuffer.js

@@ -1,10 +1,10 @@
 import root from './root.js'
 
 /** Detect free variable `exports`. */
-const freeExports = typeof exports == 'object' && exports !== null && !exports.nodeType && exports
+const freeExports = typeof exports === 'object' && exports !== null && !exports.nodeType && exports
 
 /** Detect free variable `module`. */
-const freeModule = freeExports && typeof module == 'object' && module !== null && !module.nodeType && module
+const freeModule = freeExports && typeof module === 'object' && module !== null && !module.nodeType && module
 
 /** Detect the popular CommonJS extension `module.exports`. */
 const moduleExports = freeModule && freeModule.exports === freeExports

.internal/compareAscending.js

@@ -20,7 +20,7 @@ function compareAscending(value, other) {
     const othIsReflexive = other === other
     const othIsSymbol = isSymbol(other)
 
-    const val = typeof value == 'string'
+    const val = typeof value === 'string'
       ? value.localeCompare(other)
       : -other
 

.internal/createAssigner.js

@@ -14,7 +14,7 @@ function createAssigner(assigner) {
     let customizer = length > 1 ? sources[length - 1] : undefined
     const guard = length > 2 ? sources[2] : undefined
 
-    customizer = (assigner.length > 3 && typeof customizer == 'function')
+    customizer = (assigner.length > 3 && typeof customizer === 'function')
       ? (length--, customizer)
       : undefined
 

.internal/equalObjects.js

@@ -75,8 +75,8 @@ function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
     // Non `Object` object instances with different constructors are not equal.
     if (objCtor != othCtor &&
         ('constructor' in object && 'constructor' in other) &&
-        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
-          typeof othCtor == 'function' && othCtor instanceof othCtor)) {
+        !(typeof objCtor === 'function' && objCtor instanceof objCtor &&
+          typeof othCtor === 'function' && othCtor instanceof othCtor)) {
       result = false
     }
   }

.internal/freeGlobal.js

@@ -1,4 +1,4 @@
 /** Detect free variable `global` from Node.js. */
-const freeGlobal = typeof global == 'object' && global !== null && global.Object === Object && global
+const freeGlobal = typeof global === 'object' && global !== null && global.Object === Object && global
 
 export default freeGlobal

.internal/initCloneObject.js

@@ -8,7 +8,7 @@ import isPrototype from './isPrototype.js'
  * @returns {Object} Returns the initialized clone.
  */
 function initCloneObject(object) {
-  return (typeof object.constructor == 'function' && !isPrototype(object))
+  return (typeof object.constructor === 'function' && !isPrototype(object))
     ? Object.create(Object.getPrototypeOf(object))
     : {}
 }

.internal/isIndex.js

@@ -17,8 +17,8 @@ function isIndex(value, length) {
   length = length == null ? MAX_SAFE_INTEGER : length
 
   return !!length &&
-    (type == 'number' ||
-      (type != 'symbol' && reIsUint.test(value))) &&
+    (type === 'number' ||
+      (type !== 'symbol' && reIsUint.test(value))) &&
         (value > -1 && value % 1 == 0 && value < length)
 }
 

.internal/isIterateeCall.js

@@ -19,9 +19,9 @@ function isIterateeCall(value, index, object) {
     return false
   }
   const type = typeof index
-  if (type == 'number'
+  if (type === 'number'
     ? (isArrayLike(object) && isIndex(index, object.length))
-    : (type == 'string' && index in object)
+    : (type === 'string' && index in object)
   ) {
     return eq(object[index], value)
   }

.internal/isKey.js

@@ -17,7 +17,7 @@ function isKey(value, object) {
     return false
   }
   const type = typeof value
-  if (type == 'number' || type == 'boolean' || value == null || isSymbol(value)) {
+  if (type === 'number' || type === 'boolean' || value == null || isSymbol(value)) {
     return true
   }
   return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||

.internal/isPrototype.js

@@ -10,7 +10,7 @@ const objectProto = Object.prototype
  */
 function isPrototype(value) {
   const Ctor = value && value.constructor
-  const proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto
+  const proto = (typeof Ctor === 'function' && Ctor.prototype) || objectProto
 
   return value === proto
 }

.internal/nodeTypes.js

@@ -1,10 +1,10 @@
 import freeGlobal from './freeGlobal.js'
 
 /** Detect free variable `exports`. */
-const freeExports = typeof exports == 'object' && exports !== null && !exports.nodeType && exports
+const freeExports = typeof exports === 'object' && exports !== null && !exports.nodeType && exports
 
 /** Detect free variable `module`. */
-const freeModule = freeExports && typeof module == 'object' && module !== null && !module.nodeType && module
+const freeModule = freeExports && typeof module === 'object' && module !== null && !module.nodeType && module
 
 /** Detect the popular CommonJS extension `module.exports`. */
 const moduleExports = freeModule && freeModule.exports === freeExports

.internal/root.js

@@ -2,10 +2,10 @@
 import freeGlobal from './freeGlobal.js'
 
 /** Detect free variable `globalThis` */
-const freeGlobalThis = typeof globalThis == 'object' && globalThis !== null && globalThis.Object == Object && globalThis
+const freeGlobalThis = typeof globalThis === 'object' && globalThis !== null && globalThis.Object == Object && globalThis
 
 /** Detect free variable `self`. */
-const freeSelf = typeof self == 'object' && self !== null && self.Object === Object && self
+const freeSelf = typeof self === 'object' && self !== null && self.Object === Object && self
 
 /** Used as a reference to the global object. */
 const root = freeGlobalThis || freeGlobal || freeSelf || Function('return this')()

.internal/toKey.js

@@ -11,7 +11,7 @@ const INFINITY = 1 / 0
  * @returns {string|symbol} Returns the key.
  */
 function toKey(value) {
-  if (typeof value == 'string' || isSymbol(value)) {
+  if (typeof value === 'string' || isSymbol(value)) {
     return value
   }
   const result = `${value}`