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fix(eslint-plugin): isTypeReadonly error with <TS3.7 #3731

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merged 2 commits into from Aug 30, 2021
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fix(eslint-plugin): isTypeReadonly error with <TS3.7 #3731

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8727289
fix(eslint-plugin): isTypeReadonly error with <TS3.7
RebeccaStevens Aug 13, 2021
a6c3bad
chore: add myself to contributors list
RebeccaStevens Jul 25, 2021
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7 changes: 7 additions & 0 deletions .all-contributorsrc
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Expand Up @@ -400,6 +400,13 @@
"avatar_url": "https://avatars.githubusercontent.com/u/16860535?v=4",
"profile": "https://github.com/soobing",
"contributions": []
},
{
"login": "RebeccaStevens",
"name": "Rebecca Stevens",
"avatar_url": "https://avatars.githubusercontent.com/u/7224206?v=4",
"profile": "https://github.com/RebeccaStevens",
"contributions": []
}
],
"contributorsPerLine": 5
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7 changes: 6 additions & 1 deletion packages/eslint-plugin/src/util/isTypeReadonly.ts
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Expand Up @@ -23,7 +23,12 @@ function isTypeReadonlyArrayOrTuple(
seenTypes: Set<ts.Type>,
): Readonlyness {
function checkTypeArguments(arrayType: ts.TypeReference): Readonlyness {
const typeArguments = checker.getTypeArguments(arrayType);
const typeArguments =
// getTypeArguments was only added in TS3.7
checker.getTypeArguments
? checker.getTypeArguments(arrayType)
: arrayType.typeArguments ?? [];

// this shouldn't happen in reality as:
// - tuples require at least 1 type argument
// - ReadonlyArray requires at least 1 type argument
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