ae3d28b5eb
* Implement constructor type guard * Fix code review issues for constructor type guard. - Do not limit constructor expression to only identifiers - Fix `assumeTrue` and operator no-narrow check - Use better way to check that identifier type is a function - Loosen restriction on what expr is left of ".constructor" - Update typeGuardConstructorClassAndNumber test to include else cases * Fix grammar & spacing in `narrowTypeByConstructor` * fix bad merge * switch (back?) to crlf * update baselines Co-authored-by: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
19 lines
397 B
TypeScript
19 lines
397 B
TypeScript
// Union of primitives, number, arrays, and C1
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let var1: number | "hello" | "world" | true | false | number[] | string[];
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if (var1.constructor === Number) {
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var1; // number
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}
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if (var1.constructor === String) {
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var1; // "hello" | "world"
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}
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if (var1.constructor === Boolean) {
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var1; // boolean
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}
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if (var1.constructor === Array) {
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var1; // number[] | string[]
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}
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