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core(uses-preload): prevent infinite loop #5184

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merged 3 commits into from
May 12, 2018
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patrickhulce
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fixes an infinite loop on https://emojityper.com/

attacked from multiple prongs:

  • simulator won't try to simulate graphs with cycles
  • graphs with dependency cycles not just dependent cycles are caught
  • fix the creation of a cyclic graph in preload audit

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@paulirish paulirish left a comment

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nice. thx for these fixes.
one idea

* @return {boolean}
*/
static hasCycle(node) {
static hasCycle(node, direction = 'all') {
if (direction === 'all') {
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it seems like the only use we have of this method checks things with the root node, implying we only care about one direction. Maybe we just rename this to hasCycleInDependents until we need the other direction?

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wait, isn't it always checking both? Why have an option at all

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discussed in person, I'll add a comment here

const nodesToExplore = direction === 'dependents' ?
currentNode._dependents :
currentNode._dependencies;
for (const dependent of nodesToExplore) {
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call it nextNode or something? Confusing to flatten like that

* @return {boolean}
*/
static hasCycle(node) {
static hasCycle(node, direction = 'all') {
if (direction === 'all') {
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wait, isn't it always checking both? Why have an option at all

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@brendankenny brendankenny left a comment

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LGTM!

@paulirish paulirish merged commit 61e3403 into master May 12, 2018
@paulirish paulirish deleted the fix_preload_infinite_loop branch May 12, 2018 01:16
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3 participants