middleware.js
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import { argsert } from './argsert.js';
import { isPromise } from './utils/is-promise.js';
export class GlobalMiddleware {
constructor(yargs) {
this.globalMiddleware = [];
this.frozens = [];
this.yargs = yargs;
}
addMiddleware(callback, applyBeforeValidation, global = true, mutates = false) {
argsert('<array|function> [boolean] [boolean] [boolean]', [callback, applyBeforeValidation, global], 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');
}
const m = callback[i];
m.applyBeforeValidation = applyBeforeValidation;
m.global = global;
}
Array.prototype.push.apply(this.globalMiddleware, callback);
}
else if (typeof callback === 'function') {
const m = callback;
m.applyBeforeValidation = applyBeforeValidation;
m.global = global;
m.mutates = mutates;
this.globalMiddleware.push(callback);
}
return this.yargs;
}
addCoerceMiddleware(callback, option) {
const aliases = this.yargs.getAliases();
this.globalMiddleware = this.globalMiddleware.filter(m => {
const toCheck = [...(aliases[option] || []), option];
if (!m.option)
return true;
else
return !toCheck.includes(m.option);
});
callback.option = option;
return this.addMiddleware(callback, true, true, true);
}
getMiddleware() {
return this.globalMiddleware;
}
freeze() {
this.frozens.push([...this.globalMiddleware]);
}
unfreeze() {
const frozen = this.frozens.pop();
if (frozen !== undefined)
this.globalMiddleware = frozen;
}
reset() {
this.globalMiddleware = this.globalMiddleware.filter(m => m.global);
}
}
export function commandMiddlewareFactory(commandMiddleware) {
if (!commandMiddleware)
return [];
return commandMiddleware.map(middleware => {
middleware.applyBeforeValidation = false;
return middleware;
});
}
export function applyMiddleware(argv, yargs, middlewares, beforeValidation) {
return middlewares.reduce((acc, middleware) => {
if (middleware.applyBeforeValidation !== beforeValidation) {
return acc;
}
if (middleware.mutates) {
if (middleware.applied)
return acc;
middleware.applied = true;
}
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);
return isPromise(result)
? result.then(middlewareObj => Object.assign(acc, middlewareObj))
: Object.assign(acc, result);
}
}, argv);
}