@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
147 lines • 7.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@typescript-eslint/utils");
const util_1 = require("../util");
const analyzeChain_1 = require("./prefer-optional-chain-utils/analyzeChain");
const checkNullishAndReport_1 = require("./prefer-optional-chain-utils/checkNullishAndReport");
const gatherLogicalOperands_1 = require("./prefer-optional-chain-utils/gatherLogicalOperands");
exports.default = (0, util_1.createRule)({
name: 'prefer-optional-chain',
meta: {
type: 'suggestion',
docs: {
description: 'Enforce using concise optional chain expressions instead of chained logical ands, negated logical ors, or empty objects',
recommended: 'stylistic',
requiresTypeChecking: true,
},
fixable: 'code',
hasSuggestions: true,
messages: {
preferOptionalChain: "Prefer using an optional chain expression instead, as it's more concise and easier to read.",
optionalChainSuggest: 'Change to an optional chain.',
},
schema: [
{
type: 'object',
additionalProperties: false,
properties: {
checkAny: {
type: 'boolean',
description: 'Check operands that are typed as `any` when inspecting "loose boolean" operands.',
},
checkUnknown: {
type: 'boolean',
description: 'Check operands that are typed as `unknown` when inspecting "loose boolean" operands.',
},
checkString: {
type: 'boolean',
description: 'Check operands that are typed as `string` when inspecting "loose boolean" operands.',
},
checkNumber: {
type: 'boolean',
description: 'Check operands that are typed as `number` when inspecting "loose boolean" operands.',
},
checkBoolean: {
type: 'boolean',
description: 'Check operands that are typed as `boolean` when inspecting "loose boolean" operands.',
},
checkBigInt: {
type: 'boolean',
description: 'Check operands that are typed as `bigint` when inspecting "loose boolean" operands.',
},
requireNullish: {
type: 'boolean',
description: 'Skip operands that are not typed with `null` and/or `undefined` when inspecting "loose boolean" operands.',
},
allowPotentiallyUnsafeFixesThatModifyTheReturnTypeIKnowWhatImDoing: {
type: 'boolean',
description: 'Allow autofixers that will change the return type of the expression. This option is considered unsafe as it may break the build.',
},
},
},
],
},
defaultOptions: [
{
checkAny: true,
checkUnknown: true,
checkString: true,
checkNumber: true,
checkBoolean: true,
checkBigInt: true,
requireNullish: false,
allowPotentiallyUnsafeFixesThatModifyTheReturnTypeIKnowWhatImDoing: false,
},
],
create(context, [options]) {
const parserServices = (0, util_1.getParserServices)(context);
const seenLogicals = new Set();
return {
// specific handling for `(foo ?? {}).bar` / `(foo || {}).bar`
'LogicalExpression[operator="||"], LogicalExpression[operator="??"]'(node) {
const leftNode = node.left;
const rightNode = node.right;
const parentNode = node.parent;
const isRightNodeAnEmptyObjectLiteral = rightNode.type === utils_1.AST_NODE_TYPES.ObjectExpression &&
rightNode.properties.length === 0;
if (!isRightNodeAnEmptyObjectLiteral ||
parentNode.type !== utils_1.AST_NODE_TYPES.MemberExpression ||
parentNode.optional) {
return;
}
seenLogicals.add(node);
function isLeftSideLowerPrecedence() {
const logicalTsNode = parserServices.esTreeNodeToTSNodeMap.get(node);
const leftTsNode = parserServices.esTreeNodeToTSNodeMap.get(leftNode);
const leftPrecedence = (0, util_1.getOperatorPrecedence)(leftTsNode.kind, logicalTsNode.operatorToken.kind);
return leftPrecedence < util_1.OperatorPrecedence.LeftHandSide;
}
(0, checkNullishAndReport_1.checkNullishAndReport)(context, parserServices, options, [leftNode], {
messageId: 'preferOptionalChain',
node: parentNode,
suggest: [
{
messageId: 'optionalChainSuggest',
fix: (fixer) => {
const leftNodeText = context.sourceCode.getText(leftNode);
// Any node that is made of an operator with higher or equal precedence,
const maybeWrappedLeftNode = isLeftSideLowerPrecedence()
? `(${leftNodeText})`
: leftNodeText;
const propertyToBeOptionalText = context.sourceCode.getText(parentNode.property);
const maybeWrappedProperty = parentNode.computed
? `[${propertyToBeOptionalText}]`
: propertyToBeOptionalText;
return fixer.replaceTextRange(parentNode.range, `${maybeWrappedLeftNode}?.${maybeWrappedProperty}`);
},
},
],
});
},
'LogicalExpression[operator!="??"]'(node) {
if (seenLogicals.has(node)) {
return;
}
const { operands, newlySeenLogicals } = (0, gatherLogicalOperands_1.gatherLogicalOperands)(node, parserServices, context.sourceCode, options);
for (const logical of newlySeenLogicals) {
seenLogicals.add(logical);
}
let currentChain = [];
for (const operand of operands) {
if (operand.type === "Invalid" /* OperandValidity.Invalid */) {
(0, analyzeChain_1.analyzeChain)(context, parserServices, options, node, node.operator, currentChain);
currentChain = [];
}
else {
currentChain.push(operand);
}
}
// make sure to check whatever's left
if (currentChain.length > 0) {
(0, analyzeChain_1.analyzeChain)(context, parserServices, options, node, node.operator, currentChain);
}
},
};
},
});
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