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frontend/webapp/node_modules/eslint/lib/rules/func-style.js

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+/**
+ * @fileoverview Rule to enforce a particular function style
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		defaultOptions: [
+			"expression",
+			{
+				allowArrowFunctions: false,
+				overrides: {},
+			},
+		],
+
+		docs: {
+			description:
+				"Enforce the consistent use of either `function` declarations or expressions assigned to variables",
+			recommended: false,
+			frozen: true,
+			url: "https://eslint.org/docs/latest/rules/func-style",
+		},
+
+		schema: [
+			{
+				enum: ["declaration", "expression"],
+			},
+			{
+				type: "object",
+				properties: {
+					allowArrowFunctions: {
+						type: "boolean",
+					},
+					overrides: {
+						type: "object",
+						properties: {
+							namedExports: {
+								enum: ["declaration", "expression", "ignore"],
+							},
+						},
+						additionalProperties: false,
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+
+		messages: {
+			expression: "Expected a function expression.",
+			declaration: "Expected a function declaration.",
+		},
+	},
+
+	create(context) {
+		const [style, { allowArrowFunctions, overrides }] = context.options;
+		const enforceDeclarations = style === "declaration";
+		const { namedExports: exportFunctionStyle } = overrides;
+		const stack = [];
+
+		const nodesToCheck = {
+			FunctionDeclaration(node) {
+				stack.push(false);
+
+				if (
+					!enforceDeclarations &&
+					node.parent.type !== "ExportDefaultDeclaration" &&
+					(typeof exportFunctionStyle === "undefined" ||
+						node.parent.type !== "ExportNamedDeclaration")
+				) {
+					context.report({ node, messageId: "expression" });
+				}
+
+				if (
+					node.parent.type === "ExportNamedDeclaration" &&
+					exportFunctionStyle === "expression"
+				) {
+					context.report({ node, messageId: "expression" });
+				}
+			},
+			"FunctionDeclaration:exit"() {
+				stack.pop();
+			},
+
+			FunctionExpression(node) {
+				stack.push(false);
+
+				if (
+					enforceDeclarations &&
+					node.parent.type === "VariableDeclarator" &&
+					(typeof exportFunctionStyle === "undefined" ||
+						node.parent.parent.parent.type !==
+							"ExportNamedDeclaration")
+				) {
+					context.report({
+						node: node.parent,
+						messageId: "declaration",
+					});
+				}
+
+				if (
+					node.parent.type === "VariableDeclarator" &&
+					node.parent.parent.parent.type ===
+						"ExportNamedDeclaration" &&
+					exportFunctionStyle === "declaration"
+				) {
+					context.report({
+						node: node.parent,
+						messageId: "declaration",
+					});
+				}
+			},
+			"FunctionExpression:exit"() {
+				stack.pop();
+			},
+
+			"ThisExpression, Super"() {
+				if (stack.length > 0) {
+					stack[stack.length - 1] = true;
+				}
+			},
+		};
+
+		if (!allowArrowFunctions) {
+			nodesToCheck.ArrowFunctionExpression = function () {
+				stack.push(false);
+			};
+
+			nodesToCheck["ArrowFunctionExpression:exit"] = function (node) {
+				const hasThisOrSuperExpr = stack.pop();
+
+				if (
+					!hasThisOrSuperExpr &&
+					node.parent.type === "VariableDeclarator"
+				) {
+					if (
+						enforceDeclarations &&
+						(typeof exportFunctionStyle === "undefined" ||
+							node.parent.parent.parent.type !==
+								"ExportNamedDeclaration")
+					) {
+						context.report({
+							node: node.parent,
+							messageId: "declaration",
+						});
+					}
+
+					if (
+						node.parent.parent.parent.type ===
+							"ExportNamedDeclaration" &&
+						exportFunctionStyle === "declaration"
+					) {
+						context.report({
+							node: node.parent,
+							messageId: "declaration",
+						});
+					}
+				}
+			};
+		}
+
+		return nodesToCheck;
+	},
+};