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feat(eslint-plugin): add rule no-unsafe-member-access
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packages/eslint-plugin/docs/rules/no-unsafe-member-access.md
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| # Disallows member access on any typed variables (`no-unsafe-member-access`) | ||
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| Despite your best intentions, the `any` type can sometimes leak into your codebase. | ||
| Member access on `any` typed variables is not checked at all by TypeScript, so it creates a potential safety hole, and source of bugs in your codebase. | ||
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| ## Rule Details | ||
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| This rule disallows member access on any variable that is typed as `any`. | ||
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| Examples of **incorrect** code for this rule: | ||
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| ```ts | ||
| declare const anyVar: any; | ||
| declare const nestedAny: { prop: any }; | ||
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| anyVar.a; | ||
| anyVar.a.b; | ||
| anyVar['a']; | ||
| anyVar['a']['b']; | ||
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| nestedAny.prop.a; | ||
| nestedAny.prop['a']; | ||
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| const key = 'a'; | ||
| nestedAny.prop[key]; | ||
| ``` | ||
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| Examples of **correct** code for this rule: | ||
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| ```ts | ||
| declare const properlyTyped: { prop: { a: string } }; | ||
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| nestedAny.prop.a; | ||
| nestedAny.prop['a']; | ||
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| const key = 'a'; | ||
| nestedAny.prop[key]; | ||
| ``` | ||
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| ## Related to | ||
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| - [`no-explicit-any`](./no-explicit-any.md) | ||
| - TSLint: [`no-unsafe-any`](https://palantir.github.io/tslint/rules/no-unsafe-any/) |
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73 changes: 73 additions & 0 deletions
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packages/eslint-plugin/src/rules/no-unsafe-member-access.ts
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| import { TSESTree } from '@typescript-eslint/experimental-utils'; | ||
| import * as util from '../util'; | ||
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| const enum State { | ||
| Unsafe = 1, | ||
| Safe = 2, | ||
| } | ||
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| export default util.createRule({ | ||
| name: 'no-unsafe-member-access', | ||
| meta: { | ||
| type: 'problem', | ||
| docs: { | ||
| description: 'Disallows member access on any typed variables', | ||
| category: 'Possible Errors', | ||
| recommended: false, | ||
| requiresTypeChecking: true, | ||
| }, | ||
| messages: { | ||
| unsafeMemberExpression: | ||
| 'Unsafe member access {{property}} on an any value', | ||
| }, | ||
| schema: [], | ||
| }, | ||
| defaultOptions: [], | ||
| create(context) { | ||
| const { program, esTreeNodeToTSNodeMap } = util.getParserServices(context); | ||
| const checker = program.getTypeChecker(); | ||
| const sourceCode = context.getSourceCode(); | ||
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| const stateCache = new Map<TSESTree.Node, State>(); | ||
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| function checkMemberExpression( | ||
| node: TSESTree.MemberExpression | TSESTree.OptionalMemberExpression, | ||
| ): State { | ||
| const cachedState = stateCache.get(node); | ||
| if (cachedState) { | ||
| return cachedState; | ||
| } | ||
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| if (util.isMemberOrOptionalMemberExpression(node.object)) { | ||
| const objectState = checkMemberExpression(node.object); | ||
| if (objectState === State.Unsafe) { | ||
| // if the object is unsafe, we know this will be unsafe as well | ||
| // we don't need to report, as we have already reported on the inner member expr | ||
| stateCache.set(node, objectState); | ||
| return objectState; | ||
| } | ||
| } | ||
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| const tsNode = esTreeNodeToTSNodeMap.get(node.object); | ||
| const state = util.isAnyType(tsNode, checker) ? State.Unsafe : State.Safe; | ||
| stateCache.set(node, state); | ||
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| if (state === State.Unsafe) { | ||
| const propertyName = sourceCode.getText(node.property); | ||
| context.report({ | ||
| node, | ||
| messageId: 'unsafeMemberExpression', | ||
| data: { | ||
| property: node.computed ? `[${propertyName}]` : `.${propertyName}`, | ||
| }, | ||
| }); | ||
| } | ||
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| return state; | ||
| } | ||
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| return { | ||
| 'MemberExpression, OptionalMemberExpression': checkMemberExpression, | ||
| }; | ||
| }, | ||
| }); |
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