mirror of https://github.com/nuxt/nuxt.git
37 lines
921 B
JavaScript
37 lines
921 B
JavaScript
export const sequence = function sequence(tasks, fn) {
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return tasks.reduce(
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(promise, task) => promise.then(() => fn(task)),
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Promise.resolve()
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)
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}
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export const parallel = function parallel(tasks, fn) {
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return Promise.all(tasks.map(fn))
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}
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export const chainFn = function chainFn(base, fn) {
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if (typeof fn !== 'function') {
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return base
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}
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return function (...args) {
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if (typeof base !== 'function') {
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return fn.apply(this, args)
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}
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let baseResult = base.apply(this, args)
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// Allow function to mutate the first argument instead of returning the result
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if (baseResult === undefined) {
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[baseResult] = args
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}
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const fnResult = fn.call(
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this,
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baseResult,
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...Array.prototype.slice.call(args, 1)
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)
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// Return mutated argument if no result was returned
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if (fnResult === undefined) {
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return baseResult
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}
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return fnResult
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}
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}
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