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node_modules/eslint-plugin-react/lib/util/variable.js

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+/**
+ * @fileoverview Utility functions for React components detection
+ * @author Yannick Croissant
+ */
+
+'use strict';
+
+const toReversed = require('array.prototype.toreversed');
+
+/**
+ * Search a particular variable in a list
+ * @param {Array} variables The variables list.
+ * @param {string} name The name of the variable to search.
+ * @returns {Boolean} True if the variable was found, false if not.
+ */
+function findVariable(variables, name) {
+  return variables.some((variable) => variable.name === name);
+}
+
+/**
+ * Find and return a particular variable in a list
+ * @param {Array} variables The variables list.
+ * @param {string} name The name of the variable to search.
+ * @returns {Object} Variable if the variable was found, null if not.
+ */
+function getVariable(variables, name) {
+  return variables.find((variable) => variable.name === name);
+}
+
+/**
+ * List all variable in a given scope
+ *
+ * Contain a patch for babel-eslint to avoid https://github.com/babel/babel-eslint/issues/21
+ *
+ * @param {Object} context The current rule context.
+ * @returns {Array} The variables list
+ */
+function variablesInScope(context) {
+  let scope = context.getScope();
+  let variables = scope.variables;
+
+  while (scope.type !== 'global') {
+    scope = scope.upper;
+    variables = scope.variables.concat(variables);
+  }
+  if (scope.childScopes.length) {
+    variables = scope.childScopes[0].variables.concat(variables);
+    if (scope.childScopes[0].childScopes.length) {
+      variables = scope.childScopes[0].childScopes[0].variables.concat(variables);
+    }
+  }
+
+  return toReversed(variables);
+}
+
+/**
+ * Find a variable by name in the current scope.
+ * @param {Object} context The current rule context.
+ * @param  {string} name Name of the variable to look for.
+ * @returns {ASTNode|null} Return null if the variable could not be found, ASTNode otherwise.
+ */
+function findVariableByName(context, name) {
+  const variable = getVariable(variablesInScope(context), name);
+
+  if (!variable || !variable.defs[0] || !variable.defs[0].node) {
+    return null;
+  }
+
+  if (variable.defs[0].node.type === 'TypeAlias') {
+    return variable.defs[0].node.right;
+  }
+
+  if (variable.defs[0].type === 'ImportBinding') {
+    return variable.defs[0].node;
+  }
+
+  return variable.defs[0].node.init;
+}
+
+/**
+ * Returns the latest definition of the variable.
+ * @param {Object} variable
+ * @returns {Object | undefined} The latest variable definition or undefined.
+ */
+function getLatestVariableDefinition(variable) {
+  return variable.defs[variable.defs.length - 1];
+}
+
+module.exports = {
+  findVariable,
+  findVariableByName,
+  getVariable,
+  variablesInScope,
+  getLatestVariableDefinition,
+};