10000 fix(eslint-plugin): [consistent-indexed-object-style] use a suggestion over an auto-fix if can't reliably determine that produced index signature is valid by ronami · Pull Request #10490 · typescript-eslint/typescript-eslint · GitHub
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fix(eslint-plugin): [consistent-indexed-object-style] use a suggestion over an auto-fix if can't reliably determine that produced index signature is valid #10490

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Merged
merged 4 commits into from
Dec 21, 2024
Merged

fix(eslint-plugin): [consistent-indexed-object-style] use a suggestion over an auto-fix if can't reliably determine that produced index signature is valid #10490

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c95044f
initial implementation
ronami Dec 11, 2024
2a046b6
add tests
ronami Dec 11, 2024
635da35
Merge branch 'main' into consistent-indexed-object-style-change-auto-fix
ronami Dec 13, 2024
023265d
use getFixOrSuggest
ronami Dec 17, 2024
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39 changes: 32 additions & 7 deletions packages/eslint-plugin/src/rules/consistent-indexed-object-style.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,17 @@ import type { ReportFixFunction } from '@typescript-eslint/utils/ts-eslint';

import { AST_NODE_TYPES, ASTUtils } from '@typescript-eslint/utils';

import { createRule, isParenthesized, nullThrows } from '../util';
import {
createRule,
getFixOrSuggest,
isParenthesized,
nullThrows,
} from '../util';

type MessageIds = 'preferIndexSignature' | 'preferRecord';
type MessageIds =
| 'preferIndexSignature'
| 'preferIndexSignatureSuggestion'
| 'preferRecord';
type Options = ['index-signature' | 'record'];

export default createRule<Options, MessageIds>({
Expand All @@ -17,8 +25,12 @@ export default createRule<Options, MessageIds>({
recommended: 'stylistic',
},
fixable: 'code',
// eslint-disable-next-line eslint-plugin/require-meta-has-suggestions -- suggestions are exposed through a helper.
hasSuggestions: true,
messages: {
preferIndexSignature: 'An index signature is preferred over a record.',
preferIndexSignatureSuggestion:
'Change into an index signature instead of a record.',
preferRecord: 'A record is preferred over an index signature.',
},
schema: [
Expand Down Expand Up @@ -113,14 +125,27 @@ export default createRule<Options, MessageIds>({
return;
}

const indexParam = params[0];

const shouldFix =
indexParam.type === AST_NODE_TYPES.TSStringKeyword ||
indexParam.type === AST_NODE_TYPES.TSNumberKeyword ||
indexParam.type === AST_NODE_TYPES.TSSymbolKeyword;

context.report({
node,
messageId: 'preferIndexSignature',
fix(fixer) {
const key = context.sourceCode.getText(params[0]);
const type = context.sourceCode.getText(params[1]);
return fixer.replaceText(node, `{ [key: ${key}]: ${type} }`);
},
...getFixOrSuggest({
fixOrSuggest: shouldFix ? 'fix' : 'suggest',
suggestion: {
messageId: 'preferIndexSignatureSuggestion',
fix: fixer => {
const key = context.sourceCode.getText(params[0]);
const type = context.sourceCode.getText(params[1]);
return fixer.replaceText(node, `{ [key: ${key}]: ${type} }`);
},
},
}),
});
},
}),
Expand Down
51 changes: 51 additions & 0 deletions packages/eslint-plugin/tests/rules/consistent-indexed-object-style.test.ts
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Expand Up @@ -401,6 +401,57 @@ interface Foo {
output: 'type Foo = Generic<{ [key: string]: any }>;',
},

// Record with an index node that may potentially break index-signature style
{
code: 'type Foo = Record<string | number, any>;',
errors: [
{
column: 12,
line: 1,
messageId: 'preferIndexSignature',
suggestions: [
{
messageId: 'preferIndexSignatureSuggestion',
output: 'type Foo = { [key: string | number]: any };',
},
],
},
],
options: ['index-signature'],
},
{
code: "type Foo = Record<Exclude<'a' | 'b' | 'c', 'a'>, any>;",
errors: [
{
column: 12,
line: 1,
messageId: 'preferIndexSignature',
suggestions: [
{
messageId: 'preferIndexSignatureSuggestion',
output:
"type Foo = { [key: Exclude<'a' | 'b' | 'c', 'a'>]: any };",
},
],
},
],
options: ['index-signature'],
},

// Record with valid index node should use an auto-fix
{
code: 'type Foo = Record<number, any>;',
errors: [{ column: 12, line: 1, messageId: 'preferIndexSignature' }],
options: ['index-signature'],
output: 'type Foo = { [key: number]: any };',
},
{
code: 'type Foo = Record<symbol, any>;',
errors: [{ column: 12, line: 1, messageId: 'preferIndexSignature' }],
options: ['index-signature'],
output: 'type Foo = { [key: symbol]: any };',
},

// Function types
{
code: 'function foo(arg: Record<string, any>) {}',
Expand Down
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