99 lines
2.8 KiB
JavaScript
99 lines
2.8 KiB
JavaScript
/**
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* @fileoverview Rule to enforce a particular function style
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* @author Nicholas C. Zakas
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "enforce the consistent use of either `function` declarations or expressions",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/func-style"
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},
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schema: [
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{
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enum: ["declaration", "expression"]
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},
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{
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type: "object",
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properties: {
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allowArrowFunctions: {
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type: "boolean",
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default: false
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}
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},
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additionalProperties: false
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}
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],
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messages: {
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expression: "Expected a function expression.",
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declaration: "Expected a function declaration."
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}
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},
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create(context) {
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const style = context.options[0],
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allowArrowFunctions = context.options[1] && context.options[1].allowArrowFunctions,
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enforceDeclarations = (style === "declaration"),
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stack = [];
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const nodesToCheck = {
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FunctionDeclaration(node) {
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stack.push(false);
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if (!enforceDeclarations && node.parent.type !== "ExportDefaultDeclaration") {
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context.report({ node, messageId: "expression" });
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}
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},
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"FunctionDeclaration:exit"() {
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stack.pop();
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},
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FunctionExpression(node) {
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stack.push(false);
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if (enforceDeclarations && node.parent.type === "VariableDeclarator") {
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context.report({ node: node.parent, messageId: "declaration" });
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}
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},
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"FunctionExpression:exit"() {
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stack.pop();
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},
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ThisExpression() {
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if (stack.length > 0) {
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stack[stack.length - 1] = true;
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}
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}
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};
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if (!allowArrowFunctions) {
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nodesToCheck.ArrowFunctionExpression = function() {
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stack.push(false);
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};
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nodesToCheck["ArrowFunctionExpression:exit"] = function(node) {
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const hasThisExpr = stack.pop();
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if (enforceDeclarations && !hasThisExpr && node.parent.type === "VariableDeclarator") {
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context.report({ node: node.parent, messageId: "declaration" });
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}
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};
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}
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return nodesToCheck;
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}
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};
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