73 lines
2.9 KiB
Plaintext
73 lines
2.9 KiB
Plaintext
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const utils_1 = require("@typescript-eslint/utils");
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const util_1 = require("../util");
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const getMemberExpressionName = (member) => {
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if (!member.computed) {
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return member.property.name;
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}
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if (member.property.type === utils_1.AST_NODE_TYPES.Literal &&
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typeof member.property.value === 'string') {
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return member.property.value;
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}
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return null;
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};
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exports.default = (0, util_1.createRule)({
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name: 'prefer-reduce-type-parameter',
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meta: {
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type: 'problem',
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docs: {
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description: 'Enforce using type parameter when calling `Array#reduce` instead of casting',
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recommended: 'strict',
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requiresTypeChecking: true,
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},
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messages: {
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preferTypeParameter: 'Unnecessary cast: Array#reduce accepts a type parameter for the default value.',
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},
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fixable: 'code',
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schema: [],
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},
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defaultOptions: [],
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create(context) {
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const services = (0, util_1.getParserServices)(context);
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const checker = services.program.getTypeChecker();
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return {
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'CallExpression > MemberExpression.callee'(callee) {
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if (getMemberExpressionName(callee) !== 'reduce') {
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return;
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}
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const [, secondArg] = callee.parent.arguments;
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if (callee.parent.arguments.length < 2 || !(0, util_1.isTypeAssertion)(secondArg)) {
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return;
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}
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// Get the symbol of the `reduce` method.
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const calleeObjType = (0, util_1.getConstrainedTypeAtLocation)(services, callee.object);
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// Check the owner type of the `reduce` method.
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if (checker.isArrayType(calleeObjType)) {
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context.report({
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messageId: 'preferTypeParameter',
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node: secondArg,
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fix: fixer => {
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const fixes = [
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fixer.removeRange([
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secondArg.range[0],
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secondArg.expression.range[0],
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]),
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fixer.removeRange([
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secondArg.expression.range[1],
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secondArg.range[1],
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]),
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];
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if (!callee.parent.typeArguments) {
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fixes.push(fixer.insertTextAfter(callee, `<${context.sourceCode.getText(secondArg.typeAnnotation)}>`));
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}
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return fixes;
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},
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});
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return;
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}
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},
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};
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},
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});
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//# sourceMappingURL=prefer-reduce-type-parameter.js.map
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