@typescript-eslint/eslint-plugin/dist/rules/no-unnecessary-type-constraint.js

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@typescript-eslint/utils");
const semver = __importStar(require("semver"));
const ts = __importStar(require("typescript"));
const util = __importStar(require("../util"));
const is3dot5 = semver.satisfies(ts.version, `>= 3.5.0 || >= 3.5.1-rc || >= 3.5.0-beta`, {
    includePrerelease: true,
});
const is3dot9 = is3dot5 &&
    semver.satisfies(ts.version, `>= 3.9.0 || >= 3.9.1-rc || >= 3.9.0-beta`, {
        includePrerelease: true,
    });
exports.default = util.createRule({
    name: 'no-unnecessary-type-constraint',
    meta: {
        docs: {
            description: 'Disallows unnecessary constraints on generic types',
            recommended: 'error',
            suggestion: true,
        },
        fixable: 'code',
        messages: {
            unnecessaryConstraint: 'Constraining the generic type `{{name}}` to `{{constraint}}` does nothing and is unnecessary.',
        },
        schema: [],
        type: 'suggestion',
    },
    defaultOptions: [],
    create(context) {
        if (!is3dot5) {
            return {};
        }
        // In theory, we could use the type checker for more advanced constraint types...
        // ...but in practice, these types are rare, and likely not worth requiring type info.
        // https://github.com/typescript-eslint/typescript-eslint/pull/2516#discussion_r495731858
        const unnecessaryConstraints = is3dot9
            ? new Map([
                [utils_1.AST_NODE_TYPES.TSAnyKeyword, 'any'],
                [utils_1.AST_NODE_TYPES.TSUnknownKeyword, 'unknown'],
            ])
            : new Map([[utils_1.AST_NODE_TYPES.TSUnknownKeyword, 'unknown']]);
        const inJsx = context.getFilename().toLowerCase().endsWith('tsx');
        const checkNode = (node, inArrowFunction) => {
            const constraint = unnecessaryConstraints.get(node.constraint.type);
            if (constraint) {
                context.report({
                    data: {
                        constraint,
                        name: node.name.name,
                    },
                    fix(fixer) {
                        return fixer.replaceTextRange([node.name.range[1], node.constraint.range[1]], inArrowFunction && inJsx ? ',' : '');
                    },
                    messageId: 'unnecessaryConstraint',
                    node,
                });
            }
        };
        return {
            ':not(ArrowFunctionExpression) > TSTypeParameterDeclaration > TSTypeParameter[constraint]'(node) {
                checkNode(node, false);
            },
            'ArrowFunctionExpression > TSTypeParameterDeclaration > TSTypeParameter[constraint]'(node) {
                checkNode(node, true);
            },
        };
    },
});
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