39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.compose = void 0;
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function compose(middleware) {
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if (!Array.isArray(middleware)) {
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throw new TypeError('Middleware stack must be an array!');
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}
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for (const fn of middleware) {
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if (typeof fn !== 'function') {
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throw new TypeError('Middleware must be composed of functions!');
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}
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}
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return function (context, next) {
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// last called middleware #
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let index = -1;
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return dispatch.call(this, 0);
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function dispatch(i) {
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if (i <= index) {
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return Promise.reject(new Error('next() called multiple times'));
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}
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index = i;
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let fn = middleware[i];
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if (i === middleware.length) {
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fn = next;
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}
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if (!fn) {
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return Promise.resolve();
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}
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try {
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return Promise.resolve(fn.call(this, context, dispatch.bind(this, i + 1)));
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}
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catch (err) {
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return Promise.reject(err);
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}
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}
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};
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}
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exports.compose = compose;
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//# sourceMappingURL=compose.js.map
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