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type Params = {
foo: string;
} & ({ tag: 'a'; type: number } | { tag: 'b'; type: string });
const getType = <P extends Params>(params: P) => {
const {
// Omit
foo,
...rest
} = params;
return rest;
};
declare const params: Params;
switch (params.tag) {
case 'a': {
// TS 4.2: number
// TS 4.3: string | number
const result = getType(params).type;
break;
}
case 'b': {
// TS 4.2: string
// TS 4.3: string | number
const result = getType(params).type;
break;
}
}
|
