parent
3cff57ccac
commit
a6edb3505b
23
grip.ts
23
grip.ts
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@ -9,6 +9,9 @@ interface Status {
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of(cls: any): boolean;
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}
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/**
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* Error result
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*/
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export class Err extends Error {
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Ok() {
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return false;
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@ -36,6 +39,9 @@ export class Err extends Error {
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}
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}
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/**
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* Successful result
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*/
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export class Ok {
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Ok() {
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return true;
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@ -148,14 +154,27 @@ type Unwrap<T> =
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? U
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: T;
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export type SafeResult<T> =
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type SafeResult<T> =
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T extends Promise<any>
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? Promise<Result<Unwrap<T>>>
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: T extends () => Promise<any>
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? Promise<Result<Unwrap<T>>>
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: Result<Unwrap<T>>;
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export function grip<T>(action: T) {
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/**
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* Grip wraps functions, promises or generators and returns it as a result.
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* The result can be handled as an object { value, status }, or as a tuple [value, object].
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* The result and status interfaces have the methods `ok(), fail(), of(Error)` to check the status:
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*
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* ```javascript
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* const json = grip(response.body.joson())
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* if (json.of(SyntaxError)) {
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* // handle parse error
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* }
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* // handle json.value
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* ```
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*/
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export function grip<T>(action: T): SafeResult<T> {
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if (action instanceof Promise) {
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return promise<T>(action) as SafeResult<T>;
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}
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