/
middleware.ts
88 lines (82 loc) · 2.49 KB
/
middleware.ts
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import {argsert} from './argsert.js';
import {isPromise} from './utils/is-promise.js';
import {YargsInstance, Arguments} from './yargs-factory.js';
export function globalMiddlewareFactory<T>(
globalMiddleware: Middleware[],
context: T
) {
return function (
callback: MiddlewareCallback | MiddlewareCallback[],
applyBeforeValidation = false
) {
argsert(
'<array|function> [boolean]',
[callback, applyBeforeValidation],
arguments.length
);
if (Array.isArray(callback)) {
for (let i = 0; i < callback.length; i++) {
if (typeof callback[i] !== 'function') {
throw Error('middleware must be a function');
}
(callback[
i
] as Middleware).applyBeforeValidation = applyBeforeValidation;
}
Array.prototype.push.apply(globalMiddleware, callback as Middleware[]);
} else if (typeof callback === 'function') {
(callback as Middleware).applyBeforeValidation = applyBeforeValidation;
globalMiddleware.push(callback as Middleware);
}
return context;
};
}
export function commandMiddlewareFactory(
commandMiddleware?: MiddlewareCallback[]
): Middleware[] {
if (!commandMiddleware) return [];
return commandMiddleware.map(middleware => {
(middleware as Middleware).applyBeforeValidation = false;
return middleware;
}) as Middleware[];
}
export function applyMiddleware(
argv: Arguments | Promise<Arguments>,
yargs: YargsInstance,
middlewares: Middleware[],
beforeValidation: boolean
) {
return middlewares.reduce<Arguments | Promise<Arguments>>(
(acc, middleware) => {
if (middleware.applyBeforeValidation !== beforeValidation) {
return acc;
}
if (isPromise(acc)) {
return acc
.then(initialObj =>
Promise.all<Arguments, Partial<Arguments>>([
initialObj,
middleware(initialObj, yargs),
])
)
.then(([initialObj, middlewareObj]) =>
Object.assign(initialObj, middlewareObj)
);
} else {
const result = middleware(acc, yargs);
return isPromise(result)
? result.then(middlewareObj => Object.assign(acc, middlewareObj))
: Object.assign(acc, result);
}
},
argv
);
}
export interface MiddlewareCallback {
(argv: Arguments, yargs: YargsInstance):
| Partial<Arguments>
| Promise<Partial<Arguments>>;
}
export interface Middleware extends MiddlewareCallback {
applyBeforeValidation: boolean;
}