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21 lines
600 B
Plaintext
21 lines
600 B
Plaintext
9 months ago
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const toString = Object.prototype.toString;
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export function is(val: unknown, type: string) {
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return toString.call(val) === `[object ${type}]`;
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}
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export function isDef<T = unknown>(val?: T): val is T {
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return typeof val !== 'undefined';
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}
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export function isNull(val: unknown): val is null {
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return val === null;
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}
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export function isUnDef<T = unknown>(val?: T): val is T {
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return !isDef(val);
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}
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export function isString(val: unknown): val is string {
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return is(val, 'String');
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}
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export function isNullAndUnDef(val: unknown): val is null | undefined {
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return isUnDef(val) && isNull(val);
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}
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