tools: DRY isRequireCall() in lint rules

This commit makes isRequireCall() a reusable utility
function for core's custom ESLint rules.

PR-URL: #27680
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>

tools/eslint-rules/no-duplicate-requires.js

@@ -4,6 +4,8 @@
  */
 'use strict';
 
+const { isRequireCall } = require('./rules-utils.js');
+
 //------------------------------------------------------------------------------
 // Rule Definition
 //------------------------------------------------------------------------------
@@ -13,10 +15,6 @@ function isString(node) {
   return node && node.type === 'Literal' && typeof node.value === 'string';
 }
 
-function isRequireCall(node) {
-  return node.callee.type === 'Identifier' && node.callee.name === 'require';
-}
-
 function isTopLevel(node) {
   do {
     if (node.type === 'FunctionDeclaration' ||

tools/eslint-rules/require-common-first.js

@@ -4,6 +4,7 @@
 'use strict';
 
 const path = require('path');
+const { isRequireCall } = require('./rules-utils.js');
 
 //------------------------------------------------------------------------------
 // Rule Definition
@@ -23,15 +24,6 @@ module.exports = function(context) {
     return node && node.type === 'Literal' && typeof node.value === 'string';
   }
 
-  /**
-   * Function to check if a node is a require call.
-   * @param {ASTNode} node The node to check.
-   * @returns {boolean} If the node is a require call.
-   */
-  function isRequireCall(node) {
-    return node.callee.type === 'Identifier' && node.callee.name === 'require';
-  }
-
   /**
    * Function to check if the path is a module and return its name.
    * @param {String} str The path to check

tools/eslint-rules/required-modules.js

@@ -4,6 +4,8 @@
  */
 'use strict';
 
+const { isRequireCall } = require('./rules-utils.js');
+
 //------------------------------------------------------------------------------
 // Rule Definition
 //------------------------------------------------------------------------------
@@ -32,15 +34,6 @@ module.exports = function(context) {
     return node && node.type === 'Literal' && typeof node.value === 'string';
   }
 
-  /**
-   * Function to check if a node is a require call.
-   * @param {ASTNode} node The node to check.
-   * @returns {boolean} If the node is a require call.
-   */
-  function isRequireCall(node) {
-    return node.callee.type === 'Identifier' && node.callee.name === 'require';
-  }
-
   /**
    * Function to check if the path is a required module and return its name.
    * @param {String} str The path to check

tools/eslint-rules/rules-utils.js

@@ -3,6 +3,11 @@
  */
 'use strict';
 
+function isRequireCall(node) {
+  return node.callee.type === 'Identifier' && node.callee.name === 'require';
+}
+module.exports.isRequireCall = isRequireCall;
+
 module.exports.isDefiningError = function(node) {
   return node.expression &&
          node.expression.type === 'CallExpression' &&
@@ -16,7 +21,7 @@ module.exports.isDefiningError = function(node) {
  * require calls.
  */
 module.exports.isRequired = function(node, modules) {
-  return node.callee.name === 'require' && node.arguments.length !== 0 &&
+  return isRequireCall(node) && node.arguments.length !== 0 &&
     modules.includes(node.arguments[0].value);
 };
 
@@ -26,7 +31,7 @@ module.exports.isRequired = function(node, modules) {
 */
 const commonModuleRegExp = new RegExp(/^(\.\.\/)*common(\.js)?$/);
 module.exports.isCommonModule = function(node) {
-  return node.callee.name === 'require' &&
+  return isRequireCall(node) &&
          node.arguments.length !== 0 &&
          commonModuleRegExp.test(node.arguments[0].value);
 };