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import { argsert } from './argsert.js';
import { isPromise } from './utils/is-promise.js';
export function globalMiddlewareFactory(globalMiddleware, context) {
return function (callback, 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].applyBeforeValidation = applyBeforeValidation;
}
Array.prototype.push.apply(globalMiddleware, callback);
}
else if (typeof callback === 'function') {
callback.applyBeforeValidation = applyBeforeValidation;
globalMiddleware.push(callback);
}
return context;
};
}
export function commandMiddlewareFactory(commandMiddleware) {
if (!commandMiddleware)
return [];
return commandMiddleware.map(middleware => {
middleware.applyBeforeValidation = false;
return middleware;
});
}
export function applyMiddleware(argv, yargs, middlewares, beforeValidation) {
const beforeValidationError = new Error('middleware cannot return a promise when applyBeforeValidation is true');
return middlewares.reduce((acc, middleware) => {
if (middleware.applyBeforeValidation !== beforeValidation) {
return acc;
}
if (isPromise(acc)) {
return acc
.then(initialObj => Promise.all([
initialObj,
middleware(initialObj, yargs),
]))
.then(([initialObj, middlewareObj]) => Object.assign(initialObj, middlewareObj));
}
else {
const result = middleware(acc, yargs);
if (beforeValidation && isPromise(result))
throw beforeValidationError;
return isPromise(result)
? result.then(middlewareObj => Object.assign(acc, middlewareObj))
: Object.assign(acc, result);
}
}, argv);
}