no-type-alias.js
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"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const experimental_utils_1 = require("@typescript-eslint/experimental-utils");
const util = __importStar(require("../util"));
const enumValues = [
'always',
'never',
'in-unions',
'in-intersections',
'in-unions-and-intersections',
];
exports.default = util.createRule({
name: 'no-type-alias',
meta: {
type: 'suggestion',
docs: {
description: 'Disallow the use of type aliases',
category: 'Stylistic Issues',
// too opinionated to be recommended
recommended: false,
},
messages: {
noTypeAlias: 'Type {{alias}} are not allowed.',
noCompositionAlias: '{{typeName}} in {{compositionType}} types are not allowed.',
},
schema: [
{
type: 'object',
properties: {
allowAliases: {
enum: enumValues,
},
allowCallbacks: {
enum: ['always', 'never'],
},
allowConditionalTypes: {
enum: ['always', 'never'],
},
allowConstructors: {
enum: ['always', 'never'],
},
allowLiterals: {
enum: enumValues,
},
allowMappedTypes: {
enum: enumValues,
},
allowTupleTypes: {
enum: enumValues,
},
},
additionalProperties: false,
},
],
},
defaultOptions: [
{
allowAliases: 'never',
allowCallbacks: 'never',
allowConditionalTypes: 'never',
allowConstructors: 'never',
allowLiterals: 'never',
allowMappedTypes: 'never',
allowTupleTypes: 'never',
},
],
create(context, [{ allowAliases, allowCallbacks, allowConditionalTypes, allowConstructors, allowLiterals, allowMappedTypes, allowTupleTypes, },]) {
const unions = ['always', 'in-unions', 'in-unions-and-intersections'];
const intersections = [
'always',
'in-intersections',
'in-unions-and-intersections',
];
const compositions = [
'in-unions',
'in-intersections',
'in-unions-and-intersections',
];
const aliasTypes = new Set([
experimental_utils_1.AST_NODE_TYPES.TSArrayType,
experimental_utils_1.AST_NODE_TYPES.TSTypeReference,
experimental_utils_1.AST_NODE_TYPES.TSLiteralType,
experimental_utils_1.AST_NODE_TYPES.TSTypeQuery,
experimental_utils_1.AST_NODE_TYPES.TSIndexedAccessType,
]);
/**
* Determines if the composition type is supported by the allowed flags.
* @param isTopLevel a flag indicating this is the top level node.
* @param compositionType the composition type (either TSUnionType or TSIntersectionType)
* @param allowed the currently allowed flags.
*/
function isSupportedComposition(isTopLevel, compositionType, allowed) {
return (!compositions.includes(allowed) ||
(!isTopLevel &&
((compositionType === experimental_utils_1.AST_NODE_TYPES.TSUnionType &&
unions.includes(allowed)) ||
(compositionType === experimental_utils_1.AST_NODE_TYPES.TSIntersectionType &&
intersections.includes(allowed)))));
}
/**
* Gets the message to be displayed based on the node type and whether the node is a top level declaration.
* @param node the location
* @param compositionType the type of composition this alias is part of (undefined if not
* part of a composition)
* @param isRoot a flag indicating we are dealing with the top level declaration.
* @param type the kind of type alias being validated.
*/
function reportError(node, compositionType, isRoot, type) {
if (isRoot) {
return context.report({
node,
messageId: 'noTypeAlias',
data: {
alias: type.toLowerCase(),
},
});
}
return context.report({
node,
messageId: 'noCompositionAlias',
data: {
compositionType: compositionType === experimental_utils_1.AST_NODE_TYPES.TSUnionType
? 'union'
: 'intersection',
typeName: type,
},
});
}
const isValidTupleType = (type) => {
if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSTupleType) {
return true;
}
if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSTypeOperator) {
if (['keyof', 'readonly'].includes(type.node.operator) &&
type.node.typeAnnotation &&
type.node.typeAnnotation.type === experimental_utils_1.AST_NODE_TYPES.TSTupleType) {
return true;
}
}
return false;
};
const checkAndReport = (optionValue, isTopLevel, type, label) => {
if (optionValue === 'never' ||
!isSupportedComposition(isTopLevel, type.compositionType, optionValue)) {
reportError(type.node, type.compositionType, isTopLevel, label);
}
};
/**
* Validates the node looking for aliases, callbacks and literals.
* @param type the type of composition this alias is part of (null if not
* part of a composition)
* @param isTopLevel a flag indicating this is the top level node.
*/
function validateTypeAliases(type, isTopLevel = false) {
if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSFunctionType) {
// callback
if (allowCallbacks === 'never') {
reportError(type.node, type.compositionType, isTopLevel, 'Callbacks');
}
}
else if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSConditionalType) {
// conditional type
if (allowConditionalTypes === 'never') {
reportError(type.node, type.compositionType, isTopLevel, 'Conditional types');
}
}
else if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSConstructorType) {
if (allowConstructors === 'never') {
reportError(type.node, type.compositionType, isTopLevel, 'Constructors');
}
}
else if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSTypeLiteral) {
// literal object type
checkAndReport(allowLiterals, isTopLevel, type, 'Literals');
}
else if (type.node.type === experimental_utils_1.AST_NODE_TYPES.TSMappedType) {
// mapped type
checkAndReport(allowMappedTypes, isTopLevel, type, 'Mapped types');
}
else if (isValidTupleType(type)) {
// tuple types
checkAndReport(allowTupleTypes, isTopLevel, type, 'Tuple Types');
}
else if (
// eslint-disable-next-line @typescript-eslint/internal/prefer-ast-types-enum
type.node.type.endsWith('Keyword') ||
aliasTypes.has(type.node.type) ||
(type.node.type === experimental_utils_1.AST_NODE_TYPES.TSTypeOperator &&
type.node.operator === 'readonly' &&
type.node.typeAnnotation &&
aliasTypes.has(type.node.typeAnnotation.type))) {
// alias / keyword
checkAndReport(allowAliases, isTopLevel, type, 'Aliases');
}
else {
// unhandled type - shouldn't happen
reportError(type.node, type.compositionType, isTopLevel, 'Unhandled');
}
}
/**
* Flatten the given type into an array of its dependencies
*/
function getTypes(node, compositionType = null) {
if (node.type === experimental_utils_1.AST_NODE_TYPES.TSUnionType ||
node.type === experimental_utils_1.AST_NODE_TYPES.TSIntersectionType) {
return node.types.reduce((acc, type) => {
acc.push(...getTypes(type, node.type));
return acc;
}, []);
}
if (node.type === experimental_utils_1.AST_NODE_TYPES.TSParenthesizedType) {
return getTypes(node.typeAnnotation, compositionType);
}
return [{ node, compositionType }];
}
return {
TSTypeAliasDeclaration(node) {
const types = getTypes(node.typeAnnotation);
if (types.length === 1) {
// is a top level type annotation
validateTypeAliases(types[0], true);
}
else {
// is a composition type
types.forEach(type => {
validateTypeAliases(type);
});
}
},
};
},
});
//# sourceMappingURL=no-type-alias.js.map