35 lines
912 B
TypeScript
35 lines
912 B
TypeScript
type ErrType<T> = { new(msg?: string): T }
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export type Nullable<T> = T | null | undefined
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export class RuntimeError extends Error {
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public name = 'RuntimeError';
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constructor(public message: string = '') {
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super(message);
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}
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toString(): string {
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if (this.message) {
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return this.name + ': ' + this.message;
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}
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else {
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return this.name;
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}
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}
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}
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export class NotNullExpected extends RuntimeError {
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public name = 'NotNullExpected';
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}
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export function unwrap<T>(result: Nullable<T>): T {
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if (result === null || result === undefined) {
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throw new NotNullExpected();
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}
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return result;
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}
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export function unwrap_err<T, ErrT extends Error>(result: Nullable<T>, errType: ErrType<ErrT>, errMsg?: string): T {
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if (result === null || result === undefined) {
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throw new errType(errMsg);
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}
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return result;
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} |