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fix(type-utils): union types always being marked as readonly #4419

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Merged
merged 8 commits into from
Jan 17, 2022
Merged

fix(type-utils): union types always being marked as readonly #4419

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974858a
fix(type-utils): make isTypeReadonly's options param optional
RebeccaStevens Jan 9, 2022
bb209f4
test(type-utils): add basic tests for isTypeReadonly
RebeccaStevens Jan 9, 2022
468ac17
test: add union tests for isTypeReadonly
RebeccaStevens Jan 9, 2022
dfd5a24
fix(type-utils): union types always being marked as readonly
RebeccaStevens Jan 9, 2022
f2a8cf3
Merge branch 'main' into issue-4418
RebeccaStevens Jan 11, 2022
bce11f3
Merge branch 'main' into issue-4418
RebeccaStevens Jan 17, 2022
7b36d90
Merge branch 'main' into issue-4418
RebeccaStevens Jan 17, 2022
727d999
Merge branch 'main' into issue-4418
RebeccaStevens Jan 17, 2022
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3 changes: 2 additions & 1 deletion packages/type-utils/src/isTypeReadonly.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -216,7 +216,8 @@ function isTypeReadonlyRecurser(
const result = unionTypeParts(type).every(
t =>
seenTypes.has(t) ||
isTypeReadonlyRecurser(checker, t, options, seenTypes),
isTypeReadonlyRecurser(checker, t, options, seenTypes) ===
Readonlyness.Readonly,
);
const readonlyness = result ? Readonlyness.Readonly : Readonlyness.Mutable;
return readonlyness;
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27 changes: 27 additions & 0 deletions packages/type-utils/tests/isTypeReadonly.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,33 @@ describe('isTypeReadonly', () => {
);
});
});

describe('Union', () => {
describe('is readonly', () => {
const runTests = runTestIsReadonly;

it.each([
[
'type Test = Readonly<{ foo: string; bar: number; }> & Readonly<{ bar: number; }>;',
],
['type Test = readonly string[] | readonly number[];'],
])('handles a union of 2 fully readonly types', runTests);
});

describe('is not readonly', () => {
const runTests = runTestIsNotReadonly;

it.each([
['type Test = { foo: string; bar: number; } | { bar: number; };'],
[
'type Test = { foo: string; bar: number; } | Readonly<{ bar: number; }>;',
],
[
'type Test = Readonly<{ foo: string; bar: number; }> | { bar: number; };',
],
])('handles a union of non fully readonly types', runTests);
});
});
});

describe('treatMethodsAsReadonly', () => {
Expand Down