app-builder
Version:
Promise based composable functions for middleware
52 lines • 3.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.compose = exports.functionList = void 0;
const flatten = (values) => [].concat(...values), noop = function noop() {
return Promise.resolve();
};
function functionList(list, ...args) {
const arrayList = Symbol.iterator in list ? Array.from(list) : [list];
return arrayList.map((x) => {
return (_, next) => Promise.resolve(x(...args)).then(next);
});
}
exports.functionList = functionList;
class Executor {
constructor(mw, continuation) {
this.mw = mw;
this.continuation = continuation;
}
tryInvokeMiddleware(context, middleware, next = noop) {
try {
const resolved = middleware ? middleware(context, next) : context;
return Promise.resolve(resolved);
}
catch (error) {
return Promise.reject(error);
}
}
get middleware() {
return (context, next) => {
return this.tryInvokeMiddleware(context, this.mw, this.continuation.bind(null, context, next));
};
}
}
/**
* Create a function to invoke all passed middleware functions
* with a single argument <T>context
* @param middleware
*/
function compose(...middleware) {
return flatten(middleware)
.filter((x) => {
if ('function' !== typeof x) {
throw new TypeError(`${x}, must be a middleware function accepting (context, next) arguments`);
}
return x;
})
.reduceRight((composed, mw) => {
return new Executor(mw, composed).middleware;
}, Executor.prototype.tryInvokeMiddleware);
}
exports.compose = compose;
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