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node_modules/popper.js/src/methods/update.js

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+import computeAutoPlacement from '../utils/computeAutoPlacement';
+import getReferenceOffsets from '../utils/getReferenceOffsets';
+import getPopperOffsets from '../utils/getPopperOffsets';
+import runModifiers from '../utils/runModifiers';
+
+/**
+ * Updates the position of the popper, computing the new offsets and applying
+ * the new style.<br />
+ * Prefer `scheduleUpdate` over `update` because of performance reasons.
+ * @method
+ * @memberof Popper
+ */
+export default function update() {
+  // if popper is destroyed, don't perform any further update
+  if (this.state.isDestroyed) {
+    return;
+  }
+
+  let data = {
+    instance: this,
+    styles: {},
+    arrowStyles: {},
+    attributes: {},
+    flipped: false,
+    offsets: {},
+  };
+
+  // compute reference element offsets
+  data.offsets.reference = getReferenceOffsets(
+    this.state,
+    this.popper,
+    this.reference,
+    this.options.positionFixed
+  );
+
+  // compute auto placement, store placement inside the data object,
+  // modifiers will be able to edit `placement` if needed
+  // and refer to originalPlacement to know the original value
+  data.placement = computeAutoPlacement(
+    this.options.placement,
+    data.offsets.reference,
+    this.popper,
+    this.reference,
+    this.options.modifiers.flip.boundariesElement,
+    this.options.modifiers.flip.padding
+  );
+
+  // store the computed placement inside `originalPlacement`
+  data.originalPlacement = data.placement;
+
+  data.positionFixed = this.options.positionFixed;
+
+  // compute the popper offsets
+  data.offsets.popper = getPopperOffsets(
+    this.popper,
+    data.offsets.reference,
+    data.placement
+  );
+
+  data.offsets.popper.position = this.options.positionFixed
+    ? 'fixed'
+    : 'absolute';
+
+  // run the modifiers
+  data = runModifiers(this.modifiers, data);
+
+  // the first `update` will call `onCreate` callback
+  // the other ones will call `onUpdate` callback
+  if (!this.state.isCreated) {
+    this.state.isCreated = true;
+    this.options.onCreate(data);
+  } else {
+    this.options.onUpdate(data);
+  }
+}