lib: Use === where possible

Author: nwoltman

lib/ColumnDefinitions/index.js

@@ -118,7 +118,7 @@ const ColumnDefinitions = {
   },
   enum() {
     const argsLength = arguments.length;
-    if (!argsLength) {
+    if (argsLength === 0) {
       throw new Error('You must provide at least one possible enum value');
     }
     const values = new Array(argsLength);
@@ -129,7 +129,7 @@ const ColumnDefinitions = {
   },
   set() {
     const argsLength = arguments.length;
-    if (!argsLength) {
+    if (argsLength === 0) {
       throw new Error('You must provide at least one possible set value');
     }
     const values = new Array(argsLength);

lib/MySQLTable.js

@@ -136,7 +136,7 @@ class MySQLTable {
 
     sqlString = 'SELECT EXISTS ( SELECT 1 FROM ' + this._escapedName + ' ' + sqlString + ' LIMIT 1 ) as `exists`';
 
-    if (!cb) {
+    if (cb === undefined) {
       return this._db.pquery(sqlString, values).then(checkExists);
     }
 

lib/PoolPlus.js

@@ -20,7 +20,7 @@ const MIGRATION_STRATEGIES = [
 
 function isObjectEmpty(obj) {
   for (var key in obj) {
-    if (!obj.hasOwnProperty || obj.hasOwnProperty(key)) {
+    if (obj.hasOwnProperty === undefined || obj.hasOwnProperty(key)) {
       return false;
     }
   }
@@ -184,7 +184,7 @@ class PoolPlus extends Pool {
     }
 
     var tablesRemaining = this._tables.size;
-    if (!tablesRemaining) {
+    if (tablesRemaining === 0) {
       process.nextTick(cb);
       return; // eslint-disable-line consistent-return
     }
@@ -335,7 +335,7 @@ class PoolPlus extends Pool {
           }
 
           const trxnPromise = trxnHandler(connection, handleDone);
-          if (trxnPromise) {
+          if (typeof trxnPromise === 'object' && trxnPromise !== null) {
             trxnPromise.then(commit, rollback);
           }
         });
@@ -395,7 +395,7 @@ class PoolPlus extends Pool {
   }
 
   _runOperations(operations, cb) {
-    if (!operations.length) {
+    if (operations.length === 0) {
       cb();
       return;
     }

lib/TableDefinition.js

@@ -125,7 +125,7 @@ class TableDefinition {
       const oldColumnDefinition = oldSchema.columns[oldColumnName];
       const position = lastColumnName ? ' AFTER ' + pool.escapeId(lastColumnName) : ' FIRST';
 
-      if (!oldColumnDefinition) {
+      if (oldColumnDefinition === undefined) {
         operations.push(Operation.create(
           Operation.Types.ADD_COLUMN,
           'ADD COLUMN ' + pool.escapeId(columnName) + ' ' + newColumnDefinition.$toSQL() + position
@@ -545,7 +545,7 @@ function createNormalizedSchema(schema) {
 }
 
 function getNormalizedForeignKeys(foreignKeys) {
-  if (!foreignKeys) {
+  if (foreignKeys === undefined) {
     return foreignKeys;
   }
 

lib/sqlToSchema.js

@@ -128,17 +128,15 @@ function generateColumnsSchema(createDefinitions) {
 
 function columnsSQLToSchema(sql) {
   const schema = sql.replace(/`|\s/g, '');
-
   return schema.indexOf(',') >= 0 ? schema.split(',') : schema;
 }
 
 function generatePrimaryKeySchema(createDefinitions) {
   const rgxPrimaryKey = /^\s*PRIMARY KEY \((.*?)\)/;
 
   for (var i = 0; i < createDefinitions.length; i++) {
-    var pkMatch = rgxPrimaryKey.exec(createDefinitions[i]);
-
-    if (pkMatch) {
+    const pkMatch = rgxPrimaryKey.exec(createDefinitions[i]);
+    if (pkMatch !== null) {
       return columnsSQLToSchema(pkMatch[1]);
     }
   }
@@ -163,9 +161,8 @@ function generateKeysSchema(createDefinitions, keyType) {
   }
 
   for (var i = 0; i < createDefinitions.length; i++) {
-    var keyMatch = rgxKey.exec(createDefinitions[i]);
-
-    if (keyMatch) {
+    const keyMatch = rgxKey.exec(createDefinitions[i]);
+    if (keyMatch !== null) {
       keys.push(columnsSQLToSchema(keyMatch[1]));
     }
   }
@@ -179,9 +176,8 @@ function getUnknownKeys(createDefinitions) {
     /^\s*(?:UNIQUE KEY `((?!unique_)\w+)`|KEY `((?!index_)\w+)`|SPATIAL KEY `((?!spatial_)\w+)`) \((.*?)\)/;
 
   for (var i = 0; i < createDefinitions.length; i++) {
-    var keyMatch = rgxKey.exec(createDefinitions[i]);
-
-    if (keyMatch) {
+    const keyMatch = rgxKey.exec(createDefinitions[i]);
+    if (keyMatch !== null) {
       keys.push({
         name: keyMatch[1] || keyMatch[2] || keyMatch[3],
         columns: columnsSQLToSchema(keyMatch[4]),
@@ -198,14 +194,12 @@ function generateForegnKeysSchema(createDefinitions) {
     /\s*CONSTRAINT `\w+` FOREIGN KEY \(`(.*?)`\) REFERENCES `(\w+)` \((.*?)\)(?: ON DELETE (RESTRICT|CASCADE|SET NULL|NO ACTION))?(?: ON UPDATE (RESTRICT|CASCADE|SET NULL|NO ACTION))?/;
 
   for (var i = 0; i < createDefinitions.length; i++) {
-    var keyMatch = rgxForeignKey.exec(createDefinitions[i]);
-
-    if (!keyMatch) {
+    const keyMatch = rgxForeignKey.exec(createDefinitions[i]);
+    if (keyMatch === null) {
       continue;
     }
 
     const keyColumns = columnsSQLToSchema(keyMatch[1]);
-
     foreignKeys[keyColumns] = {
       table: keyMatch[2],
       column: columnsSQLToSchema(keyMatch[3]),

lib/utils/cloneKeys.js

@@ -7,7 +7,7 @@
 'use strict';
 
 function cloneKeys(keys) {
-  if (!keys) {
+  if (keys === undefined || keys === null) {
     return null;
   }
 

lib/utils/diffKeys.js

@@ -8,13 +8,15 @@
 'use strict';
 
 function diffKeys(original, current) {
-  if (!original) {
+  if (original === undefined || original === null) {
     return {
-      addedKeys: current ? current.slice() : [],
+      addedKeys: current === undefined || current === null
+        ? []
+        : current.slice(),
       removedKeys: [],
     };
   }
-  if (!current) {
+  if (current === undefined || current === null) {
     return {
       addedKeys: [],
       removedKeys: original.slice(),