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fix(eslint-plugin): [prefer-readonly] support modifiers of unions and intersections #8169

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merged 3 commits into from
Jan 8, 2024

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@auvred auvred commented Jan 2, 2024

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Thanks for the PR, @auvred!

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Comment on lines +344 to +349
if (type.isUnion()) {
// any union of class/instance and something else will prevent access to
// private members, so we assume that union consists only of classes
// or class instances, because otherwise tsc will report an error
return this.getTypeToClassRelation(type.types[0]);
}
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Playground

class Test {
  private foo: number = 1
  private static foo: number

  test() {
    const that1 = {} as typeof Test | this
    that1.foo = 2
    //     ^ 2339: Property 'foo' does not exist on type 'this | typeof Test'

    const that2 = {} as this | { _foo: 'bar' }
    that2.foo = 2
    //     ^ 2339: Property 'foo' does not exist on type 'this | { _foo: "bar"; }'

    const that3 = {} as typeof Test | { _foo: 'bar' }
    that3.foo = 2
    //     ^ 2339: Property 'foo' does not exist on type 'typeof Test | { _foo: "bar"; }'
  }
}

@@ -251,6 +251,13 @@ type ParameterOrPropertyDeclaration =
const OUTSIDE_CONSTRUCTOR = -1;
const DIRECTLY_INSIDE_CONSTRUCTOR = 0;

enum TypeToClassRelation {
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[Praise] I found this enum and the logic around it to be quite helpful in understanding the new logic. Very readable. Nice! 👏

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💯 !

@JoshuaKGoldberg JoshuaKGoldberg merged commit 3a219c0 into typescript-eslint:main Jan 8, 2024
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Successfully merging this pull request may close these issues.

Bug: [prefer-readonly] False positive if property was assigned after type guard for class properties
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