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104 lines
3.8 KiB
JavaScript
104 lines
3.8 KiB
JavaScript
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/**
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* @fileoverview Rule to disallow unnecessary computed property keys in object literals
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* @author Burak Yigit Kaya
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const lodash = require("lodash");
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const astUtils = require("./utils/ast-utils");
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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: "disallow unnecessary computed property keys in objects and classes",
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category: "ECMAScript 6",
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recommended: false,
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url: "https://eslint.org/docs/rules/no-useless-computed-key"
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},
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schema: [{
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type: "object",
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properties: {
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enforceForClassMembers: {
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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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fixable: "code",
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messages: {
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unnecessarilyComputedProperty: "Unnecessarily computed property [{{property}}] found."
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}
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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const enforceForClassMembers = context.options[0] && context.options[0].enforceForClassMembers;
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/**
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* Reports a given node if it violated this rule.
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* @param {ASTNode} node The node to check.
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* @returns {void}
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*/
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function check(node) {
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if (!node.computed) {
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return;
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}
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const key = node.key,
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nodeType = typeof key.value;
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let allowedKey;
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if (node.type === "MethodDefinition") {
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allowedKey = node.static ? "prototype" : "constructor";
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} else {
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allowedKey = "__proto__";
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}
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if (key.type === "Literal" && (nodeType === "string" || nodeType === "number") && key.value !== allowedKey) {
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context.report({
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node,
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messageId: "unnecessarilyComputedProperty",
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data: { property: sourceCode.getText(key) },
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fix(fixer) {
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const leftSquareBracket = sourceCode.getTokenBefore(key, astUtils.isOpeningBracketToken);
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const rightSquareBracket = sourceCode.getTokenAfter(key, astUtils.isClosingBracketToken);
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// If there are comments between the brackets and the property name, don't do a fix.
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if (sourceCode.commentsExistBetween(leftSquareBracket, rightSquareBracket)) {
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return null;
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}
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const tokenBeforeLeftBracket = sourceCode.getTokenBefore(leftSquareBracket);
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// Insert a space before the key to avoid changing identifiers, e.g. ({ get[2]() {} }) to ({ get2() {} })
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const needsSpaceBeforeKey = tokenBeforeLeftBracket.range[1] === leftSquareBracket.range[0] &&
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!astUtils.canTokensBeAdjacent(tokenBeforeLeftBracket, sourceCode.getFirstToken(key));
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const replacementKey = (needsSpaceBeforeKey ? " " : "") + key.raw;
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return fixer.replaceTextRange([leftSquareBracket.range[0], rightSquareBracket.range[1]], replacementKey);
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}
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});
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}
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}
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return {
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Property: check,
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MethodDefinition: enforceForClassMembers ? check : lodash.noop
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};
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}
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};
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