type_guard.ts

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TypeScript

初級10

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上級10

utility_types.ts

api_service.ts

type_guard.ts

generic_constraint.ts

union_types.ts

mapped_type.ts

decorator.ts

template_literal.ts

conditional_type.ts

assertion.ts

エキスパート5

マスター5

type_guard.ts

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function isError(value: unknown): value is Error {↵

return value instanceof Error && "message" in value;↵

}↵

const msg = isError(e) ? e.message : "Unknown";

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