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Simplify and correct the fsWatchFile callback handling with the stats invoked

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This commit is contained in:
Sheetal Nandi 2017-11-20 16:34:48 -08:00
parent f6f465280d
commit ed5673c13c
1 changed files with 15 additions and 13 deletions
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28
src/compiler/sys.ts
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@ -232,26 +232,28 @@ namespace ts {
function fsWatchFile(fileName: string, callback: FileWatcherCallback, pollingInterval?: number): FileWatcher {
_fs.watchFile(fileName, { persistent: true, interval: pollingInterval || 250 }, fileChanged);
let eventKind: FileWatcherEventKind;
return {
close: () => _fs.unwatchFile(fileName, fileChanged)
};
function fileChanged(curr: any, prev: any) {
const isCurrZero = +curr.mtime === 0;
const isPrevZero = +prev.mtime === 0;
const created = !isCurrZero && isPrevZero;
const deleted = isCurrZero && !isPrevZero;
const eventKind = created
? FileWatcherEventKind.Created
: deleted
? FileWatcherEventKind.Deleted
: FileWatcherEventKind.Changed;
if (eventKind === FileWatcherEventKind.Changed && +curr.mtime <= +prev.mtime) {
if (+curr.mtime === 0) {
eventKind = FileWatcherEventKind.Deleted;
}
// previous event kind check is to ensure we send created event when file is restored or renamed twice (that is it disappears and reappears)
// since in that case the prevTime returned is same as prev time of event when file was deleted as per node documentation
else if (+prev.mtime === 0 || eventKind === FileWatcherEventKind.Deleted) {
eventKind = FileWatcherEventKind.Created;
}
// If there is no change in modified time, ignore the event
else if (+curr.mtime === +prev.mtime) {
return;
}
else {
// File changed
eventKind = FileWatcherEventKind.Changed;
}
callback(fileName, eventKind);
}
}