21 lines
747 B
TypeScript
21 lines
747 B
TypeScript
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import { symbol } from "./primordials.ts";
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export const valueKey: unique symbol = symbol.makeSymbol("Primitive.value") as any;
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export interface TypeMap {
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undefined: undefined;
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boolean: boolean;
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string: string;
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number: number;
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symbol: symbol;
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object: null | object;
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function: Function;
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}
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export function unwrapThis<T extends keyof TypeMap>(self: any, type: T, constr: Function, name: string, arg = "this", defaultVal?: TypeMap[T]): TypeMap[T] {
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if (typeof self === type) return self;
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if (self instanceof constr && valueKey in self) self = (self as any)[valueKey];
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if (typeof self === type) return self;
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if (defaultVal !== undefined) return defaultVal;
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throw new TypeError(name + " requires that '" + arg + "' be a " + constr.name);
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}
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