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feat(typescript-estree): forbid invalid keys in EnumMember #11232

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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
enum Foo {
1n = 2
}

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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
enum Foo {
["A"] = 2
}

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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
enum Foo {
1 = 2
}

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45 changes: 8 additions & 37 deletions packages/ast-spec/src/element/TSEnumMember/spec.ts
Original file line number Diff line number Diff line change
@@ -1,44 +1,15 @@
import type { AST_NODE_TYPES } from '../../ast-node-types';
import type { BaseNode } from '../../base/BaseNode';
import type { Identifier } from '../../expression/Identifier/spec';
import type { StringLiteral } from '../../expression/literal/StringLiteral/spec';
import type { Expression } from '../../unions/Expression';
import type {
PropertyNameComputed,
PropertyNameNonComputed,
} from '../../unions/PropertyName';

interface TSEnumMemberBase extends BaseNode {
export interface TSEnumMember extends BaseNode {
type: AST_NODE_TYPES.TSEnumMember;
computed: boolean;
id:
| PropertyNameComputed // this should only happen in semantically invalid code (ts error 1164)
| PropertyNameNonComputed;
id: Identifier | StringLiteral;
initializer: Expression | undefined;
/**
* @deprecated the enum member is always non-computed.
*/
computed: boolean;
}

/**
* this should only really happen in semantically invalid code (errors 1164 and 2452)
*
* @example
* ```ts
* // VALID:
* enum Foo { ['a'] }
*
* // INVALID:
* const x = 'a';
* enum Foo { [x] }
* enum Bar { ['a' + 'b'] }
* ```
*/
export interface TSEnumMemberComputedName extends TSEnumMemberBase {
computed: true;
id: PropertyNameComputed;
}

export interface TSEnumMemberNonComputedName extends TSEnumMemberBase {
computed: false;
id: PropertyNameNonComputed;
}

export type TSEnumMember =
| TSEnumMemberComputedName
| TSEnumMemberNonComputedName;

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