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/
no-explicit-any.ts
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/
no-explicit-any.ts
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import {
TSESTree,
AST_NODE_TYPES,
} from '@typescript-eslint/experimental-utils';
import * as util from '../util';
import { TSESLint } from '@typescript-eslint/experimental-utils';
type Options = [
{
fixToUnknown?: boolean;
ignoreRestArgs?: boolean;
}
];
type MessageIds = 'unexpectedAny';
export default util.createRule<Options, MessageIds>({
name: 'no-explicit-any',
meta: {
type: 'suggestion',
docs: {
description: 'Disallow usage of the `any` type',
category: 'Best Practices',
recommended: 'warn',
},
fixable: 'code',
messages: {
unexpectedAny: 'Unexpected any. Specify a different type.',
},
schema: [
{
type: 'object',
additionalProperties: false,
properties: {
fixToUnknown: {
type: 'boolean',
},
ignoreRestArgs: {
type: 'boolean',
},
},
},
],
},
defaultOptions: [
{
fixToUnknown: false,
ignoreRestArgs: false,
},
],
create(context, [{ ignoreRestArgs, fixToUnknown }]) {
/**
* Checks if the node is an arrow function, function declaration or function expression
* @param node the node to be validated.
* @returns true if the node is an arrow function, function declaration or function expression
* @private
*/
function isNodeValidFunction(node: TSESTree.Node): boolean {
return [
AST_NODE_TYPES.ArrowFunctionExpression,
AST_NODE_TYPES.FunctionDeclaration,
AST_NODE_TYPES.FunctionExpression,
].includes(node.type);
}
/**
* Checks if the node is a rest element child node of a function
* @param node the node to be validated.
* @returns true if the node is a rest element child node of a function
* @private
*/
function isNodeRestElementInFunction(node: TSESTree.Node): boolean {
return (
node.type === AST_NODE_TYPES.RestElement &&
typeof node.parent !== 'undefined' &&
isNodeValidFunction(node.parent)
);
}
/**
* Checks if the node is a TSTypeOperator node with a readonly operator
* @param node the node to be validated.
* @returns true if the node is a TSTypeOperator node with a readonly operator
* @private
*/
function isNodeReadonlyTSTypeOperator(node: TSESTree.Node): boolean {
return (
node.type === AST_NODE_TYPES.TSTypeOperator &&
node.operator === 'readonly'
);
}
/**
* Checks if the node is a TSTypeReference node with an Array identifier
* @param node the node to be validated.
* @returns true if the node is a TSTypeReference node with an Array identifier
* @private
*/
function isNodeValidArrayTSTypeReference(node: TSESTree.Node): boolean {
return (
node.type === AST_NODE_TYPES.TSTypeReference &&
typeof node.typeName !== 'undefined' &&
node.typeName.type === AST_NODE_TYPES.Identifier &&
['Array', 'ReadonlyArray'].includes(node.typeName.name)
);
}
/**
* Checks if the node is a valid TSTypeOperator or TSTypeReference node
* @param node the node to be validated.
* @returns true if the node is a valid TSTypeOperator or TSTypeReference node
* @private
*/
function isNodeValidTSType(node: TSESTree.Node): boolean {
return (
isNodeReadonlyTSTypeOperator(node) ||
isNodeValidArrayTSTypeReference(node)
);
}
/**
* Checks if the great grand-parent node is a RestElement node in a function
* @param node the node to be validated.
* @returns true if the great grand-parent node is a RestElement node in a function
* @private
*/
function isGreatGrandparentRestElement(node: TSESTree.Node): boolean {
return (
typeof node.parent !== 'undefined' &&
typeof node.parent.parent !== 'undefined' &&
typeof node.parent.parent.parent !== 'undefined' &&
isNodeRestElementInFunction(node.parent.parent.parent)
);
}
/**
* Checks if the great great grand-parent node is a valid RestElement node in a function
* @param node the node to be validated.
* @returns true if the great great grand-parent node is a valid RestElement node in a function
* @private
*/
function isGreatGreatGrandparentRestElement(node: TSESTree.Node): boolean {
return (
typeof node.parent !== 'undefined' &&
typeof node.parent.parent !== 'undefined' &&
isNodeValidTSType(node.parent.parent) &&
typeof node.parent.parent.parent !== 'undefined' &&
typeof node.parent.parent.parent.parent !== 'undefined' &&
isNodeRestElementInFunction(node.parent.parent.parent.parent)
);
}
/**
* Checks if the great grand-parent or the great great grand-parent node is a RestElement node
* @param node the node to be validated.
* @returns true if the great grand-parent or the great great grand-parent node is a RestElement node
* @private
*/
function isNodeDescendantOfRestElementInFunction(
node: TSESTree.Node,
): boolean {
return (
isGreatGrandparentRestElement(node) ||
isGreatGreatGrandparentRestElement(node)
);
}
return {
TSAnyKeyword(node) {
if (ignoreRestArgs && isNodeDescendantOfRestElementInFunction(node)) {
return;
}
let fix: TSESLint.ReportFixFunction | null = null;
if (fixToUnknown) {
fix = fixer => fixer.replaceText(node, 'unknown');
}
context.report({
node,
messageId: 'unexpectedAny',
fix,
});
},
};
},
});