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node_modules/minipass-flush/index.js

@@ -0,0 +1,39 @@
+const Minipass = require('minipass')
+const _flush = Symbol('_flush')
+const _flushed = Symbol('_flushed')
+const _flushing = Symbol('_flushing')
+class Flush extends Minipass {
+  constructor (opt = {}) {
+    if (typeof opt === 'function')
+      opt = { flush: opt }
+
+    super(opt)
+
+    // or extend this class and provide a 'flush' method in your subclass
+    if (typeof opt.flush !== 'function' && typeof this.flush !== 'function')
+      throw new TypeError('must provide flush function in options')
+
+    this[_flush] = opt.flush || this.flush
+  }
+
+  emit (ev, ...data) {
+    if ((ev !== 'end' && ev !== 'finish') || this[_flushed])
+      return super.emit(ev, ...data)
+
+    if (this[_flushing])
+      return
+
+    this[_flushing] = true
+
+    const afterFlush = er => {
+      this[_flushed] = true
+      er ? super.emit('error', er) : super.emit('end')
+    }
+
+    const ret = this[_flush](afterFlush)
+    if (ret && ret.then)
+      ret.then(() => afterFlush(), er => afterFlush(er))
+  }
+}
+
+module.exports = Flush