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ban-types.ts
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ban-types.ts
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import { TSESLint, TSESTree } from '@typescript-eslint/experimental-utils';
import * as util from '../util';
type Types = Record<
string,
| string
| null
| {
message: string;
fixWith?: string;
}
>;
type Options = [
{
types: Types;
},
];
type MessageIds = 'bannedTypeMessage';
function removeSpaces(str: string): string {
return str.replace(/ /g, '');
}
function stringifyTypeName(
node: TSESTree.EntityName | TSESTree.TSTypeLiteral,
sourceCode: TSESLint.SourceCode,
): string {
return removeSpaces(sourceCode.getText(node));
}
function getCustomMessage(
bannedType: null | string | { message?: string; fixWith?: string },
): string {
if (bannedType === null) {
return '';
}
if (typeof bannedType === 'string') {
return ` ${bannedType}`;
}
if (bannedType.message) {
return ` ${bannedType.message}`;
}
return '';
}
export default util.createRule<Options, MessageIds>({
name: 'ban-types',
meta: {
type: 'suggestion',
docs: {
description: 'Bans specific types from being used',
category: 'Best Practices',
recommended: 'error',
},
fixable: 'code',
messages: {
bannedTypeMessage: "Don't use '{{name}}' as a type.{{customMessage}}",
},
schema: [
{
type: 'object',
properties: {
types: {
type: 'object',
additionalProperties: {
oneOf: [
{ type: 'null' },
{ type: 'string' },
{
type: 'object',
properties: {
message: { type: 'string' },
fixWith: { type: 'string' },
},
additionalProperties: false,
},
],
},
},
},
additionalProperties: false,
},
],
},
defaultOptions: [
{
types: {
String: {
message: 'Use string instead',
fixWith: 'string',
},
Boolean: {
message: 'Use boolean instead',
fixWith: 'boolean',
},
Number: {
message: 'Use number instead',
fixWith: 'number',
},
Object: {
message: 'Object is not type safe, use Record<string, unknown> instead',
fixWith: 'Record<string, unknown>',
},
object: {
message: 'Object is not type safe, use Record<string, unknown> instead',
fixWith: 'Record<string, unknown>',
},
Symbol: {
message: 'Use symbol instead',
fixWith: 'symbol',
},
},
},
],
create(context, [{ types }]) {
const bannedTypes: Types = Object.keys(types).reduce(
(res, type) => ({ ...res, [removeSpaces(type)]: types[type] }),
{},
);
function checkBannedTypes(
typeNode: TSESTree.EntityName | TSESTree.TSTypeLiteral,
): void {
const name = stringifyTypeName(typeNode, context.getSourceCode());
if (name in bannedTypes) {
const bannedType = bannedTypes[name];
const customMessage = getCustomMessage(bannedType);
const fixWith =
bannedType && typeof bannedType === 'object' && bannedType.fixWith;
context.report({
node: typeNode,
messageId: 'bannedTypeMessage',
data: {
name,
customMessage,
},
fix: fixWith
? (fixer): TSESLint.RuleFix => fixer.replaceText(typeNode, fixWith)
: null,
});
}
}
return {
TSTypeLiteral(node): void {
if (node.members.length) {
return;
}
checkBannedTypes(node);
},
TSTypeReference({ typeName }): void {
checkBannedTypes(typeName);
},
};
},
});